JP7135281B2 - Ophthalmic laser therapy device - Google Patents

Description

The present disclosure relates to an ophthalmic laser treatment apparatus that converts the wavelength of laser light using a wavelength converter.

As an ophthalmic laser treatment apparatus that treats a patient's eye by irradiating it with laser light, a wavelength converter is used to convert infrared laser light (wavelength: 1064 nm) emitted by a laser light source into visible laser light (wavelength: 532 nm). It is known to convert In this type of laser treatment device, the angle of incidence of the infrared laser light to the wavelength converter and the temperature of the wavelength converter are optimized so that the wavelength conversion of the laser light in the wavelength converter is performed optimally (efficiently). become. For this reason, for example, a Peltier element is provided in the wavelength converter so that the temperature of the wavelength converter is adjusted to a predetermined set temperature (see Patent Document 1).

European Patent No. 2384727

However, in the above-described ophthalmic laser treatment apparatus, the support member that supports the components of the optical system is thermally deformed under the influence of the environmental temperature, particularly the internal temperature of the apparatus, and the laser beam to the wavelength converter is several μrad. It has been found that an order of magnitude change in the incident angle increases the amount of mismatch in the phase-matching condition, degrading the output stability of the wavelength-converted laser light. For example, immediately after starting the device or during long-term use, the internal temperature of the device tends to deviate from the temperature when the wavelength converter is optimally adjusted. energy) tends to increase, and output stability tends to decrease. In particular, immediately after startup in a low-temperature environment, the wavelength converter is most likely to become unstable because pointing fluctuations due to the startup of the laser light source affect the wavelength converter. As the laser irradiation continues, heat is generated from the electronic components on the control board, and the internal temperature of the device rises over time, so the output of the wavelength-converted laser light stabilizes. However, it sometimes takes 30 minutes or more until the output stability falls within a predetermined range (for example, the output fluctuation is within ±20%).

Therefore, in order to solve the above-described problems, the present disclosure provides an ophthalmological apparatus that is not easily affected by environmental temperature, can perform suitable wavelength conversion with a wavelength converter, and can improve the output stability of laser light after wavelength conversion. It is an object of the present invention to provide a laser treatment device for medical use.

One aspect of the present disclosure made to solve the above problems is
In an ophthalmic laser treatment device that treats a patient's eye by irradiating it with a laser beam,
a laser light source that emits a first wavelength laser beam;
a laser irradiation optical system for irradiating a patient's eye with laser light emitted from the laser light source;
a wavelength converter provided in the laser irradiation optical system for converting the first wavelength laser light into a second wavelength laser light;
a temperature control unit that adjusts the temperature of the wavelength converter to a predetermined temperature control temperature;
a temperature detector that detects the ambient temperature of the laser irradiation optical system or the environmental temperature that affects the ambient temperature of the laser irradiation optical system;
A control unit that determines the controlled temperature of the wavelength converter based on the temperature detected by the temperature detector, and controls the temperature control unit so that the temperature of the wavelength converter reaches the determined controlled temperature. and
When the temperature detected by the temperature detector is out of a predetermined temperature range, the control unit generates a In the adjustment for satisfying the phase matching condition in the wavelength converter, the refractive index is adjusted so that the deviation due to the change in the incident angle of the first wavelength laser beam to the wavelength converter due to the thermal deformation of the support member becomes small. The temperature control unit is controlled so that the temperature control temperature of the wavelength converter is changed and the wavelength converter has the changed temperature control temperature.

According to the ophthalmic laser treatment apparatus of the present disclosure, it is possible to improve the output stability of laser light after wavelength conversion by enabling suitable wavelength conversion by the wavelength converter without being easily affected by the environmental temperature.

BRIEF DESCRIPTION OF THE DRAWINGS It is an external view of the ophthalmic laser treatment apparatus of embodiment. 1 is a side view of the optical system of the ophthalmic laser treatment apparatus 1. FIG. 1 is a top view of the optical system of the ophthalmic laser treatment apparatus 1. FIG. It is a figure which shows the temperature of a wavelength converter, and the relationship of a refractive index. It is a perspective view which shows the peripheral part of a wavelength converter. It is a figure explaining the structure of the control system of an ophthalmic laser treatment apparatus. FIG. 10 is a graph showing the output stability (variation coefficient) of second-wavelength laser light with respect to changes in the internal temperature of the main body in a conventional device; 4 is a flow chart showing contents of temperature control (main routine) of the wavelength converter carried out by the controller; 4 is a flow chart showing the details of a wavelength converter temperature control temperature setting process (subroutine) performed by a control unit; FIG. 5 is a diagram showing temperature control temperature set values for the internal temperature of the main body. 5 is a flow chart showing the content of a temperature control process (subroutine) for a wavelength converter that is executed by a control unit; FIG. 5 is a diagram showing the output stability (variation coefficient) of second-wavelength laser light with respect to changes in the internal temperature of the main body; FIG. 10 is a diagram showing the fluctuation width of the output of the second wavelength laser light with respect to the internal temperature of the main body; FIG. 10 is a diagram showing the fluctuation range of the output of the second wavelength laser beam with respect to the internal temperature in the conventional ophthalmic laser treatment apparatus;

Hereinafter, typical embodiments of the present disclosure will be described in detail based on the drawings. First, the overall configuration of the ophthalmic laser treatment apparatus will be described with reference to FIG. FIG. 1 is an external view of an ophthalmic laser treatment apparatus 1 according to this embodiment.

<Overall composition>
An ophthalmic laser treatment apparatus 1 of this embodiment includes, as an example, a slit delivery section 2 and a table section 3, as shown in FIG. The slit delivery unit 2 irradiates therapeutic laser light for treating the affected area of the patient's eye Ep. The ophthalmic laser treatment apparatus 1 of this embodiment emits a first wavelength laser beam and a second wavelength laser beam as treatment laser beams. Further, the ophthalmic laser treatment apparatus 1 of the present embodiment includes, as an example, an irradiation optical system 10, an observation optical system 30, an illumination optical system 40, and a controller 110. FIG. Various optical systems provided in the ophthalmic laser treatment apparatus 1 of the present embodiment and the treatment laser beam will be described later in detail.

The table portion 3 of the present embodiment carries the slit delivery portion 2 thereon. The slit delivery section 2 of this embodiment includes, for example, a main body section 101, an illumination section 102, a microscope section 103, an eyepiece section 104, a displacement section 107, an operation panel section 105, a joystick section 106, and a headrest section 108. The main body 101 of this embodiment generates a first wavelength laser beam and a second wavelength laser beam. The illumination unit 102 of the present embodiment emits illumination light for observing the observation site of the patient's eye Ep. The microscope unit 103 of the present embodiment obtains an observed image of the observed region of the patient's eye Ep. The microscope unit 103 of this embodiment has an eyepiece unit 104 that provides an observation image to the operator.

The displacement unit 107 of the present embodiment moves the optical system of the ophthalmic laser treatment apparatus 1 in vertical (Y)/left/right (X)/back and forth (Z) directions. Further, the displacement unit 107 of this embodiment rotates the irradiation optical system 10 and the observation optical system 30 in the left-right (X) direction. The operation panel unit 105 of this embodiment is used by the operator to set various operating conditions of the ophthalmic laser treatment apparatus 1 . The joystick unit 106 of this embodiment is used by the operator to align various optical systems with the patient's eye Ep. The headrest portion 108 of this embodiment is used to fix the patient's face.

Next, the irradiation optical system 10 (the first irradiation optical system 10A and the second irradiation optical system 10B), the observation optical system 30, and the illumination optical system 40 will be described with reference to FIGS. 2 and 3. FIG. FIG. 2 is a side view of the optical system of the ophthalmic laser treatment apparatus 1. As shown in FIG. FIG. 3 is a top view of the optical system of the ophthalmic laser treatment apparatus 1. As shown in FIG.

<Irradiation optical system>
The irradiation optical system 10 of this embodiment is used to irradiate the patient's eye Ep with therapeutic laser light. The ophthalmic laser therapy apparatus 1 of this embodiment irradiates multiple types of therapeutic laser beams. Specifically, the ophthalmic laser treatment apparatus 1 of the present embodiment emits a first wavelength laser beam in the infrared wavelength band and a second wavelength laser beam in the visible wavelength band as multiple types of treatment laser beams having different wavelengths. do. The first wavelength laser light is used, for example, for treatment of secondary cataract. The first wavelength laser light can be used to photodisrupt or photorupture tissue in the patient's eye Ep. The first wavelength laser beam of this embodiment generates plasma in the vicinity of the condensing position of the first wavelength laser beam. The second wavelength laser light is used, for example, in selective laser trabeculoplasty (SLT). In this embodiment, light of 1064 nm is irradiated as the first wavelength laser light, and light of 532 nm is irradiated as the second wavelength laser light. The wavelength and type of therapeutic laser light are not limited to these. For example, both the first wavelength laser light and the second wavelength laser light may be capable of photocoagulating tissue in the patient's eye Ep.

The irradiation optical system 10 of this embodiment includes a first irradiation optical system 10A and a second irradiation optical system 10B. The first irradiation optical system 10A is used to irradiate the patient's eye Ep with the first wavelength laser beam. The first irradiation optical system 10A includes an optical axis L1. The second irradiation optical system 10B is used to irradiate the patient's eye Ep with the second wavelength laser beam. The second irradiation optical system 10B includes an optical axis L2. An optical path at least partially shared by the first irradiation optical system 10A and the second irradiation optical system 10B may be called a shared optical path. Also, an optical path used only by the first irradiation optical system 10A or an optical path used only by the second irradiation optical system 10B may be called a dedicated optical path.

In this embodiment, a temperature sensor 55 is arranged inside the main body 101 apart from the wavelength converter 62 in order to detect the ambient temperature of the irradiation optical system 10 . Specifically, the temperature sensor 55 is attached to a frame that holds the optical components of the irradiation optical system 10 . In this embodiment, the temperature sensor 55 is attached to the frame holding the second irradiation optical system 10B so as to be arranged near the half mirror 60 provided in the second irradiation optical system 10B. Note that the temperature sensor 55 detects the ambient temperature that affects the ambient temperature of the irradiation optical system 10 (the internal temperature of the main body 101), that is, the ambient temperature of the irradiation optical system 10 (the internal temperature of the main body 101). It can be placed in any place where the environmental temperature can be detected. Therefore, the temperature sensor 55 is arranged (mounted) on a circuit board in the control unit 110, or arranged outside the cover of the main unit 101, for example, in addition to the frame that holds the optical components of the irradiation optical system 10. be able to. In addition, when a temperature sensor is arranged on the circuit board in the control unit 110, if the circuit board is provided with the temperature sensor, the temperature sensor can be used.

<First irradiation optical system>
The first irradiation optical system 10A of this embodiment includes a laser light source 11, a first dimming section 12, a beam splitter 14, a half mirror 60, a mirror 15, a safety shutter 16, a focus shift lens group 17, a dichroic mirror 18, and a safety shutter. 19, an expander lens group 21, a dichroic mirror 22, and an objective lens 23. The irradiation optical system 10 of this embodiment shares the objective lens 23 and the dichroic mirror 22 with the observation optical system 30 . Further, in this embodiment, the members from the laser light source 11 to the half mirror 60 and the members from the safety shutter 19 to the objective lens 23 are shared by the first irradiation optical system 10A and the second irradiation optical system 10B. That is, in the ophthalmic laser treatment apparatus 1 of the present embodiment, the first wavelength laser light and the second wavelength laser light are coaxial (or substantially coaxial) and proceed to the dichroic mirror 22 . A detailed description of the second irradiation optical system 10B will be given later. The first irradiation optical system 10A of this embodiment includes a first aiming light source 71, a collimator lens 72, and an aperture 73 on a branched optical path branched by the dichroic mirror 18. FIG.

The laser light source 11 emits a first wavelength laser beam. In the laser light source 11 of the present embodiment, a neodymium-doped YAG (yttrium-aluminum-garnet) crystal (Nd:YAG) is used as a laser rod. The laser light source 11 of the first embodiment can emit a pulsed laser. The laser light source 11 of the embodiment can emit giant pulses (laser light with high energy). The laser light source 11 of this embodiment is a Q-switched YAG laser. The laser light source 11 of this embodiment is a laser light source including a Q switch element. That is, a high-power pulse can be emitted from the laser light source 11 using the Q-switching method. The vibration direction of the first wavelength laser light emitted from the laser light source 11 is linearly polarized light. The first aiming light source 71 emits aiming light that indicates the position to be irradiated with the first wavelength laser light (that is, the position of the treatment spot). In this embodiment, a light source that emits visible laser light with a wavelength of 635 nm (red) is used as the first aiming light source 71 . However, it goes without saying that the wavelength of the aiming light can be appropriately changed.

The first dimming unit 12 adjusts the energy amount of therapeutic laser light (first wavelength laser light or second wavelength laser light in this embodiment) that is irradiated to the tissue of the patient's eye Ep. The first dimming section 12 of this embodiment includes a half-wave plate 12A and a polarizing plate 12B. The half-wave plate 12A is rotated by a motor 81 around the emission optical axis of the laser light source 11 (in other words, the optical axis L1 of the first irradiation optical system 10A or the optical axis L2 of the second irradiation optical system 10B). do. The polarizing plate 12B is arranged at the Brewster's angle. The combination of the half-wave plate 12A and the polarizing plate 12B adjusts the energy of the first-wavelength laser light output from the first dimming section 12. FIG. In this embodiment, the energy of the first wavelength laser light can be adjusted in the range of at least 0.3 mJ to 10.0 mJ by the first light attenuation section 12 .

The beam splitter 14 reflects part of the first wavelength laser light toward the photodetector 82 . The photodetector 82 detects the energy amount of the first wavelength laser light by receiving the first wavelength laser light reflected by the beam splitter 14 . The safety shutter 16 is moved between on the optical axis L1 and outside the optical axis L1 by a shutter driving section 83 (for example, a solenoid). The safety shutter 16 is arranged on the optical axis L1 to block irradiation of the patient's eye Ep with the first wavelength laser beam.

The focus shift lens group 17 displaces (shifts) the focus position of the first wavelength laser light emitted from the laser light source 11 with respect to the focus position (condensing position) of the first aiming light emitted from the first aiming light source 71 . Let In the present embodiment, the focus position of the first wavelength laser light emitted from the laser light source 11 can be displaced either far or near with respect to the focus position of the first aiming light. The focus position of the treatment laser light with respect to the focus position of the aiming light may be called a focus shift position. The focus shift lens group 17 has a concave lens and a convex lens. The focus shift lens group 17 uses a motor 84 for driving the shift of the focus shift position. In this embodiment, a motor 84 is connected to the convex lens. A control unit 110, which will be described later, can adjust the focus shift position. In this embodiment, the control unit 110 can move the convex lens in the optical axis direction to adjust the focus shift position within a range of -500 μm to +500 μm.

The collimator lens 72 converts the first aiming light emitted from the first aiming light source 71 into a parallel light beam. Two holes are formed in the diaphragm 73 . The light flux passing through the collimator lens 72 is split into two by the diaphragm 73 and directed to the dichroic mirror 18 . The dichroic mirror 18 multiplexes the first wavelength laser light and the first aiming light. The dichroic mirror 18 of this embodiment reflects the first wavelength laser light and transmits the first aiming light, thereby combining the first wavelength laser light and the first aiming light. The ophthalmologic laser treatment apparatus 1 may irradiate the patient's eye Ep from separate optical paths without combining the first wavelength laser light and the first aiming light.

The safety shutter 19 is moved between on the optical axis L1 and outside the optical axis L1 by a shutter driving section 85 (for example, a solenoid). The safety shutter 19 is arranged on the optical axis L1 to prevent the laser beam (in this embodiment, the first wavelength laser beam, the second wavelength laser beam, the first aiming beam, or the second aiming beam) from reaching the patient's eye Ep. and/or light).

The expander lens group 21 receives laser light combined by the dichroic mirror 18 (in this embodiment, at least one of the first wavelength laser light, the second wavelength laser light, the first aiming light, and the second aiming light). to expand the luminous flux of The laser beam expanded by the expander lens group 21 is reflected by the dichroic mirror 22 and passes through the objective lens 23 . In this embodiment, the first wavelength laser light transmitted through the objective lens 23 is irradiated to the tissue of the patient's eye Ep via the contact lens 24 attached to the patient's eye Ep. The dichroic mirror 22 reflects light of the wavelength of the reflected light so that the reflected light of the first wavelength laser light reflected by the patient's eye Ep is less likely to enter the operator's eye.

<Second irradiation optical system>
The second irradiation optical system 10B of the present embodiment includes a laser light source 11, a first attenuation section 12, a beam splitter 14, a half mirror 60, a half-wave plate 61, a wavelength converter 62, a reduction optical section 63, a second A light reducing section 64 , a beam splitter 65 , a dichroic mirror 66 , a movable mirror 67 , a safety shutter 19 , an expander lens group 21 , a dichroic mirror 22 and an objective lens 23 are provided. As described above, in this embodiment, the members from the laser light source 11 to the half mirror 60 and the members from the safety shutter 19 to the objective lens 23 are shared by the first irradiation optical system 10A and the second irradiation optical system 10B. do. The second irradiation optical system 10</b>B of this embodiment shares the objective lens 23 and the dichroic mirror 22 with the observation optical system 30 . Henceforth, description of a shared member is abbreviate|omitted. In this embodiment, when the patient's eye Ep is irradiated with the first wavelength laser beam, the movable mirror 67 is retracted from the optical axis L1, and when the patient's eye Ep is irradiated with the second wavelength laser beam, The movable mirror 67 is positioned (inserted) on the optical axis L1. As a result, inside the ophthalmic laser treatment apparatus 1, the case of irradiating the first wavelength laser beam and the case of irradiating the second wavelength laser beam are switched. In this embodiment, the patient's eye Ep is irradiated with a pulse laser obtained by wavelength-converting the first wavelength laser light emitted from the laser light source 11 (Q-switched YAG laser light).

The flow of light in the second irradiation optical system will be briefly described. The first wavelength laser light emitted from the laser light source 11 travels through the first light reducing section 12 and the beam splitter 14 in that order, and is reflected by the half mirror 60 toward the wavelength converter 62 . The first-wavelength laser beam reflected by the half mirror 60 is incident on the wavelength converter 62 with its polarization direction rotated by the half-wave plate 61 . Then, the first wavelength laser light is converted into the second wavelength laser light by the wavelength converter 62 . The second-wavelength laser light emitted from the wavelength converter 62 travels through the reducing optical section 63, the second light-attenuating section 64, the beam splitter 65, and the dichroic mirror 66 in this order, and moves to a movable mirror 67 inserted on the optical axis L1. is reflected toward the safety shutter 19 at . The beam diameter of the second-wavelength laser light is reduced by the reducing optical section 63 , and the energy is adjusted by the second light reduction section 64 . After that, the second wavelength laser beam reflected by the movable mirror 67 travels through the safety shutter 19 and the expander lens group 21 in that order, and is reflected by the dichroic mirror 22 toward the objective lens 23 . The second wavelength laser light reflected by the dichroic mirror 22 and transmitted through the objective lens 23 is irradiated to the tissue of the patient's eye Ep via the contact lens 24 attached to the patient's eye Ep.

The wavelength converter 62 of this embodiment converts the first wavelength laser light (wavelength: 1064 nm) emitted by the laser light source 11 into second wavelength laser light (wavelength: 532 nm). Details of the wavelength converter 62 of this embodiment will be described later.

The second aiming light source 94 is used as a light source for alignment for irradiating the affected part of the patient's eye Ep with the second wavelength laser light. In this embodiment, a light source that emits visible laser light with a wavelength of 635 nm (red) is used as the second aiming light source 94 . However, it goes without saying that the wavelength of the aiming light can be appropriately changed. The second aiming light emitted from the second aiming light source 94 travels toward the dichroic mirror 66 .

A dichroic mirror 66 combines the second wavelength laser light and the second aiming light. The dichroic mirror 66 of the present embodiment reflects the second aiming light and transmits the second wavelength laser light, thereby combining the second wavelength laser light and the second aiming light. The ophthalmic laser treatment apparatus 1 may irradiate the patient's eye Ep from separate optical paths without combining the second wavelength laser light and the second aiming light.

The movable mirror 67 is moved between on the optical axis L1 and outside the optical axis L1 by a mirror driver 95 (for example, a motor). The mirror driver 95 is connected to the controller 110 . When irradiating the patient's eye Ep with the first wavelength laser light, the controller 110 retracts the movable mirror 67 from the optical axis L1. When irradiating the patient's eye Ep with the second wavelength laser light, the controller 110 moves the movable mirror 67 onto the optical axis L1. The second wavelength laser light reflected by the movable mirror 67 is directed toward the safety shutter 19 . After the safety shutter 19, the optical path is shared with the first irradiation optical system, so the explanation is omitted.

Here, a case of performing selective laser trabeculoplasty (SLT) will be described as an example of treatment using the second wavelength laser light of the present embodiment. SLT is a therapeutic method for irradiating the trabecular meshwork at the angle of the patient's eye Ep with a therapeutic laser beam in order to increase the amount of aqueous humor discharged from the patient's eye Ep. In SLT, treatment laser light (pulse light) is irradiated multiple times over the entire circumference or part of the annular trabecular meshwork. In SLT, a contact lens 24 is attached to the cornea of the patient's eye Ep. For the contact lens 24, for example, a gonioscope (gonioscope) for observing the angle of the patient's eye Ep, or a Goldmann's trihedral mirror can be used. The angle is observed through a reflecting mirror provided on the contact lens 24 . While adjusting the position of the contact lens 24, the operator aligns the irradiation position of the aiming light emitted from the second aiming light source 94 with the spot to be treated. The operator operates the trigger switch 116 after the alignment is completed to irradiate the treatment spot with the second wavelength laser beam.

<Observation optical system>
The observation optical system 30 of this embodiment is used by the operator to observe the observation site of the patient's eye Ep. In this embodiment, the observed region of the patient's eye Ep can be observed from two directions (multiple directions), and for example, the operator can view the observed region stereoscopically. As shown in FIGS. 2 and 3, the observation optical system 30 of this embodiment includes an optical axis L3R for providing an observation image to the operator's right eye and an optical axis L3L for providing an observation image to the operator's left eye. , an objective lens 23, a dichroic mirror 22, a variable magnification optical system 31 (31R, 31L), an operator protection filter 32 (32R, 32L), an imaging lens 33 (33R, 33L), an erecting prism group 34 ( 34R, 34L), a field stop 35 (35R, 35L), and an eyepiece 36 (36R, 36L).

A variable power optical system 31 is used to change the observation magnification. For example, a rotating drum or the like in which a plurality of lenses having different refractive powers are combined can be used for the variable magnification optical system 31 . The operator protection filter 32 prevents the therapeutic laser light reflected by the patient's eye Ep or the like from reaching the operator's eye Eo. The operator protection filter 32 of this embodiment has the characteristic of attenuating the wavelength of the treatment laser light. In this embodiment, the objective lens 23 and the dichroic mirror 22 are shared by the observation optical system 30 and the irradiation optical system 10 . The dichroic mirror 22 of the present embodiment transmits observation light (visible light) from the patient's eye Ep, and transmits the first wavelength laser light (infrared light) and the second wavelength laser light (visible light) to the patient's eye Ep. reflect towards.

<Illumination optical system>
The illumination optical system 40 of the present embodiment illuminates the observation site of the patient's eye Ep with observation light. In the present embodiment, visible light is applied to the observation site of the patient's eye Ep. The illumination optical system 40 includes a lamp 41, a lens 42, an aperture 43, a lens group 44, and a prism 45, for example. For example, the lamp 41 may be an incandescent lamp, a light emitting diode, or the like. The illumination optical system 40 may include a slit plate or the like for illuminating the observation site with slit light.

<Wavelength converter>
Here, the details of the wavelength converter 62 of this embodiment provided in the second irradiation optical system 10B will be described. As described above, the wavelength converter 62 of this embodiment converts the first wavelength laser beam (wavelength: 1064 nm) emitted by the laser light source 11 into the second wavelength laser beam (wavelength: 532 nm). In this embodiment, a nonlinear crystal is used as the wavelength converter 62 . Specifically, a KTP crystal is used as the wavelength converter 62 . A nonlinear crystal has a nonlinear response of a crystal to incident light, and a KTP crystal was used in this embodiment. Note that the KTP crystal has birefringence properties. Birefringence (crystal) has a different refractive index depending on the direction of the crystal and the direction of polarization. In this embodiment, a KTP crystal is used as the wavelength converter 62 to convert 1064 nm laser light as the fundamental wave into 532 nm laser light as the second harmonic of the fundamental wave. In order to obtain the maximum output in wavelength conversion by the wavelength converter 62, it is necessary to satisfy the phase matching condition (the condition for matching the phases of the incident light (1064 nm) and the outgoing light (532 nm)). Both the angle of incidence to the transducer 62 and the polarization direction are optimized. In this embodiment, in order to satisfy the phase matching condition, not only must the phase matching condition be strictly satisfied (the amount of mismatch is zero), but also the amount of mismatch must be small (near zero) and the maximum output can be obtained. Alternatively, it also includes a state in which emitted light of substantially maximum output is obtained.

As shown in FIG. 4, the wavelength converter 62 (KTP crystal) of this embodiment has a refractive index that changes with temperature, and the refractive index and temperature are in a proportional relationship. FIG. 4 is a diagram showing the relationship between the temperature and the refractive index of the wavelength converter 62. As shown in FIG. That is, when the temperature of the wavelength converter 62 increases, the refractive index increases, and when the temperature of the wavelength converter 62 decreases, the refractive index decreases. Then, when the refractive index of the wavelength converter 62 changes, the mismatch amount of the phase matching conditions in the wavelength converter 62 may increase. Therefore, in the present embodiment, the refractive index, which is the phase matching condition that maximizes the wavelength conversion efficiency in the wavelength converter 62, is achieved by temperature control. As shown in FIG. 5, the wavelength converter 62 is provided with a temperature control unit 52 that performs temperature control so that the temperature of the wavelength converter 62 is maintained at a predetermined temperature control temperature. FIG. 5 is a perspective view showing the peripheral portion of the wavelength converter.

The temperature control unit 52 is attached to a holding holder 50 for arranging the wavelength converter 62 at a predetermined position. The holding holder 50 of this embodiment is a U-shaped member made of aluminum. A wavelength converter 62 is arranged in the holding holder 50, and the wavelength converter 62 is pressed and fixed to the holding holder 50 by a metal holding plate 51 (elastic member). A Peltier element 53 and a thermistor 54 are provided in the holding holder 50 . The Peltier element 53 heats or cools the wavelength converter 62 via the holding holder 50 . A thermistor 54 is used to detect the temperature of the wavelength converter 62 . Then, the Peltier element 53 heats or cools the wavelength converter 62 through the holding holder 50 so that the temperature detected by the thermistor 54 is maintained at a predetermined temperature control temperature. That is, in this embodiment, the Peltier element 53 and the thermistor 54 constitute the temperature control unit 52 . The temperature control unit 52 is connected to the control section 110 , and the temperature control of the wavelength converter 62 by the temperature control unit 52 is performed by the control section 110 . Details of the temperature control of the wavelength converter 62 by the temperature control unit 52 will be described later.

Then, the wavelength converter 62 outputs linearly polarized second-wavelength laser light. In this embodiment, the polarization direction of the second-wavelength laser light output from the wavelength converter 62 is constant even if the energy of the first-wavelength laser light incident on the wavelength converter 62 changes. The KTP crystal described above is merely an example of the wavelength converter 62 , and a nonlinear crystal other than the KTP crystal can also be used as the wavelength converter 62 .

<Control part>
Next, the controller 110 of this embodiment will be described with reference to FIG. FIG. 6 is a diagram for explaining the configuration of the control system of the ophthalmic laser treatment apparatus 1. As shown in FIG. The control unit 110 controls operations of the ophthalmic laser treatment apparatus 1 . The control unit 110 of this embodiment includes a CPU 111 (processor), a ROM 112, a RAM 113, and a nonvolatile memory 114 (flash memory, EEPROM, etc.). The CPU 111 controls each part in the ophthalmic laser therapy apparatus 1 . The ROM 112 stores various programs, initial values, and the like. That is, the ROM 112 stores a temperature control program for the wavelength converter 62 by the temperature control unit 52 . The RAM 113 temporarily stores various information. The nonvolatile memory 114 is a non-transitory storage medium that can retain stored content even when power supply is cut off. For example, a USB memory detachably attached to the control unit 110, a flash ROM built in the control unit 110, or the like may be used as the nonvolatile memory 114. FIG.

In this embodiment, the control unit 110 includes the laser light source 11, the motor 81, the photodetector 82, the shutter driving unit 83, the motor 84, the first aiming light source 71, the shutter driving unit 85, the lamp 41, the temperature control unit 52, A temperature sensor 55, a photodetector 93, a second aiming light source 94, a mirror drive section 95, an operation panel section 105, a joystick section 106, a trigger switch 116, a display screen 115 and the like are connected. The display screen 115 of this embodiment displays various setting states of the ophthalmic laser therapy apparatus 1 . The trigger switch 116 is operated by the operator to transmit a trigger signal for therapeutic laser light. The trigger switch 116 of this embodiment is a footswitch. The form of the trigger switch 116 is not limited to a foot switch, and for example, a trigger switch may be provided at the top of the joystick section 106 .

<How to use this embodiment>
Next, irradiation of the affected area with the first-wavelength laser beam or the second-wavelength laser beam using the ophthalmic laser treatment apparatus 1 of the present embodiment will be described. In this embodiment, the affected area irradiated with the first wavelength laser beam and the affected area irradiated with the second wavelength laser beam are different. The method of using the ophthalmic laser treatment apparatus 1 is not limited to the description given later.

First, the operation of treatment with the first wavelength laser light using the ophthalmic laser treatment apparatus 1 of this embodiment will be described. The operator operates as follows. First, the operation panel unit 105 is operated to select the first wavelength laser beam irradiation mode. Subsequently, various settings of the ophthalmic laser treatment apparatus 1 are performed. Various settings include adjustment of the irradiation energy of the first wavelength laser light. Subsequently, the patient's face is fixed to the headrest section 108 . Then, look into the eyepiece 104 for observation. Subsequently, while observing the observation image, the joystick unit 106 is operated to aim the first aiming light at the affected area (in this embodiment, the posterior lens capsule) of the patient's eye Ep. Subsequently, the trigger switch 116 is pressed to irradiate the affected area of the patient's eye Ep with the first wavelength laser light (pulsed laser light) once or multiple times. When the control unit 110 detects that the trigger switch 116 has been pressed, the control unit 110 controls the laser light source 11 to emit a pulsed laser beam from the laser light source 11 . The ophthalmic laser treatment apparatus 1 irradiates the patient's eye Ep with a first wavelength laser beam (pulsed laser beam) emitted from a laser light source 11 (Q-switched YAG laser). When the operator selects the first wavelength laser beam irradiation mode, the controller 110 retracts the movable mirror 67 from the optical axis L1.

Next, the operation of treatment with the second wavelength laser light using the ophthalmic laser treatment apparatus 1 of this embodiment will be described. The operator operates as follows. First, the operation panel unit 105 is operated to select the second wavelength laser beam irradiation mode. Subsequently, various settings of the ophthalmic laser treatment apparatus 1 are performed. Various settings include adjustment of the irradiation energy of the second wavelength laser light. Subsequently, the patient's face is fixed to the headrest section 108 . Then, look into the eyepiece 104 for observation. Subsequently, while observing the observation image, the joystick unit 106 is operated to aim the second aiming light at the affected area (trabecular meshwork in this embodiment) of the patient's eye Ep. Subsequently, the trigger switch 116 is pressed to irradiate the affected area of the patient's eye Ep with the second wavelength laser beam (pulsed laser beam) once or multiple times. When the control unit 110 detects that the trigger switch 116 has been pressed, the control unit 110 controls the laser light source 11 to emit a pulsed laser beam from the laser light source 11 . The ophthalmic laser treatment apparatus 1 wavelength-converts the first-wavelength laser beam (pulsed laser beam) emitted from the laser light source 11 (Q-switched YAG laser) into the second-wavelength laser beam by the wavelength converter 62, The patient's eye Ep is irradiated with the second wavelength laser beam. When the operator selects the second wavelength laser beam irradiation mode, the controller 110 arranges the movable mirror 67 on the optical axis L1.

Here, when performing treatment with the second wavelength laser light, the wavelength converter 62 wavelength-converts the first wavelength laser light into the second wavelength laser light. Therefore, in the present embodiment, the incident angle of the first-wavelength laser light to the wavelength converter 62 and the refractive index of the wavelength converter 62 are appropriately adjusted so that the wavelength conversion of the laser light in the wavelength converter 62 is performed satisfactorily. It is That is, the refractive index of the wavelength converter 62 is adjusted by the incident angle of the first wavelength laser light to the wavelength converter 62 so that the wavelength converter 62 satisfies the phase matching condition. The adjustment of the refractive index in the wavelength converter 62 is performed by maintaining the wavelength converter 62 at a predetermined controlled temperature.

However, under the influence of the internal temperature of the main body 101, the support member that supports the components of the irradiation optical system 10 is thermally deformed, and the incident angle of the first wavelength laser beam to the wavelength converter 62 becomes very small (μrad (order) may change, and the output stability of the wavelength-converted second-wavelength laser light may deteriorate. That is, due to the influence of the internal temperature of the main body 101, the adjustment for satisfying the phase matching condition in the wavelength converter 62 deviates, and the output stability of the second wavelength laser light is lowered. For example, if the support member that supports the half mirror 60 is affected by temperature change, the incident angle of the first wavelength laser light to the wavelength converter 62 slightly changes (μ rad order). The output stability of the light decreases, that is, the output (energy) of the second wavelength laser light emitted from the wavelength converter 62 fluctuates more.

In the conventional ophthalmic laser treatment device, the wavelength converter 62 is operated in the first temperature range (an example of the predetermined temperature range of the present disclosure), which is the temperature range normally used within the usable temperature range of the device. The incident angle of the first wavelength laser light to the wavelength converter 62 is adjusted and the controlled temperature of the wavelength converter 62 is set to an optimum value so as to satisfy the phase matching condition. That is, the wavelength converter 62 is adjusted to satisfy the phase matching condition in the first temperature range. Therefore, as indicated by the solid line in FIG. 7, in the first temperature range, the coefficient of variation of the second wavelength laser light is small and the output stability is good. On the other hand, even within the usable temperature range of the device, the second wavelength laser is The variation coefficient of light becomes large, and the output stability deteriorates. This is because the amount of mismatch in the phase matching condition increases due to a slight change in the angle of incidence on the wavelength converter 62 when the light exits the first temperature range. FIG. 7 is a graph showing the stability (variation coefficient) of the second-wavelength laser beam with respect to changes in the internal temperature of the main body in the conventional device.

Here, in the second temperature region or the third temperature region, as described above, the angle of incidence of the first-wavelength laser light to the wavelength converter 62 slightly changes (μ rad order) to satisfy the optimum phase matching condition. Easy to disappear. In other words, the adjustment deviation of the wavelength converter 62 is likely to occur. However, the adjustment deviation caused by a slight change in the angle of incidence of the first-wavelength laser light on the wavelength converter 62 can be reduced (the phase matching condition is satisfied) by adjusting the refractive index of the wavelength converter 62 . . That is, under the respective environments of the second temperature range and the third temperature range, the temperature control temperature of the wavelength converter 62 may be set to the optimum set value for each temperature range. Specifically, in the second temperature region, if the temperature control temperature of the wavelength converter 62 is changed to the optimum set value in the second temperature region, the adjustment deviation is reduced as indicated by the one-dot chain line in FIG. (The phase matching condition is satisfied), and the output stability (variation coefficient) of the second wavelength laser light can be improved. Similarly, in the third temperature range, if the temperature control temperature of the wavelength converter 62 is changed to the optimum set value for the third temperature range, the adjustment deviation is reduced as indicated by the chain double-dashed line in FIG. (The phase matching condition is satisfied), and the output stability (variation coefficient) of the second wavelength laser light can be improved. Note that the smaller the value of the output stability (variation coefficient), the higher (better) the stability, and the larger the value, the lower (worse) the stability.

Therefore, in this embodiment, the control unit 110 detects the internal temperature of the main body unit 101 with the temperature sensor 55, and based on the detection result of the temperature sensor 55, the ambient temperature of the irradiation optical system 10 is set in the first to third temperature ranges. , the temperature control temperature of the wavelength converter 62 is changed to the optimum set value in each temperature range, and the temperature is adjusted so as to maintain the temperature of the wavelength converter 62 at the changed temperature control temperature. controls the tone unit 52; In addition, in this embodiment, the setting of the temperature control temperature is changed to the optimum set value, but it is not limited to this. The temperature control of the wavelength converter 62 by the temperature control unit 52 will be described below with reference to FIGS. 8 to 11. FIG. FIG. 8 is a flow chart showing the temperature control (main routine) of the wavelength converter 62 performed by the controller 110 . FIG. 9 is a flow chart showing the content of the temperature control temperature setting process (subroutine) of the wavelength converter 62 executed by the controller 110. As shown in FIG. FIG. 10 is a diagram showing temperature control temperature setting values of the wavelength converter 62 with respect to the internal temperature of the main body 101. As shown in FIG. FIG. 11 is a flow chart showing the details of the temperature control process (subroutine) for the wavelength converter 62 performed by the controller 110. As shown in FIG.

As shown in FIG. 8, the control unit 110 first performs temperature control temperature setting processing for setting the temperature control temperature of the wavelength converter 62 to an optimum value (step S1). That is, as shown in FIG. 9, the controller 110 detects the internal temperature of the main body 101 with the temperature sensor 55 (step S11). Then, control unit 110 determines whether the detected temperature is less than 20° C. (step S12). In other words, control unit 110 determines whether or not the inside of body unit 101 is in the second temperature range. At this time, if the temperature detected by the temperature sensor 55 is less than 20° C. (step S12: YES), the controller 110 determines that the inside of the main body 101 is in the second temperature range, and performs wavelength conversion. The temperature control temperature of the device 62 is set to be lower than the standard set value T0 by T1 so as to be optimum in the second temperature region (to satisfy the phase matching condition) (step S13).

Note that the standard set value T0 is the temperature control temperature at which the wavelength converter 62 satisfies the phase matching condition in the first temperature range (20° C. or more and less than 30° C.). have set. Further, the adjustment value T1 is determined so as to set a temperature control temperature that reduces (minimizes) the adjustment deviation of the wavelength converter 62 in the second temperature range. Since the optimum value of this adjustment value T1 differs depending on the specifications of the laser treatment apparatus, it may be determined by experiments for each specification, but T1 is considered to be set to about 1 to 3°C. In this embodiment, for example, T1 is set to 1 [°C]. These standard setting value T0 and adjustment value T1 are stored in non-volatile memory 114, and are read out from non-volatile memory 114 as appropriate while control unit 110 is executing temperature control temperature setting processing.

On the other hand, when the temperature detected by the temperature sensor 55 is 20° C. or higher (step S12: NO), the control unit 110 determines whether it is in the first temperature range or the third temperature range. It is determined whether or not the temperature detected by the temperature sensor 55 is less than 30° C. (step S14). At this time, if the temperature detected by the temperature sensor 55 is less than 30° C. (step S14: YES), the controller 110 determines that the inside of the main body 101 is in the first temperature range, and performs wavelength conversion. The temperature control temperature of the vessel 62 is set to the standard set value T0 that is optimum in the first temperature range (step S15). On the other hand, when the temperature detected by the temperature sensor 55 is 30° C. or higher (step S14: NO), the controller 110 determines that the inside of the main body 101 is in the third temperature range, and the wavelength converter 62 is set higher than the standard set value T0 by T1 so as to be optimal in the third temperature region (to satisfy the phase matching condition) (step S16). The adjustment value T1 set in the third temperature range has the same absolute value as the adjustment value set in the second temperature range, but in the second temperature range, the adjustment value T1 is subtracted from the standard set value T0, In the third temperature range, the adjustment value T1 is added to the standard set value T0.

As a result, in the ophthalmic laser treatment apparatus 1 of the present embodiment, as shown in FIG. 10, the temperature control temperature of the wavelength converter 62 is 34° C. (=T0− T1), and the temperature control temperature of the wavelength converter 62 is 35° C. (=T0 ), and the temperature control temperature of the wavelength converter 62 is set to 36° C. (=T0+T1) in the third temperature region where the internal temperature is 30° C. or higher.

In this embodiment, an adjustment value T1 corresponding to each temperature region (environment) is stored in the nonvolatile memory 114, and the wavelength conversion is performed by adding or subtracting the adjustment value T1 to or from the standard set value T0 according to the temperature detected by the temperature sensor 55. It changes (determines) the set value of the temperature control temperature of the device 62 . Of course, the temperature control temperature setting values corresponding to each temperature range are stored in the non-volatile memory 114 as table data, and the temperature control temperature setting values of the wavelength converter 62 are stored based on the table data according to the temperature detected by the temperature sensor 55 . can also be changed.

Further, each temperature region can be subdivided and the temperature control temperature of the wavelength converter 62 corresponding to each temperature region can be set. In this case, for example, the adjustment value T1 may be stored in the nonvolatile memory 114 as table data having a plurality of values corresponding to subdivided temperature ranges. Of course, the temperature control temperature setting values corresponding to the subdivided temperature ranges may be stored in the nonvolatile memory 114 as table data. By doing so, the adjustment of the wavelength converter 62 can be performed with higher accuracy, so that the output stability of the second wavelength laser light can be further enhanced. The setting of the temperature control temperature is not limited to table data, and may be calculated from calculation results, for example.

After determining (changing) the setting value of the temperature control temperature of the wavelength converter 62 in this manner, the control unit 110 performs temperature control processing of the wavelength converter 62 (step S2). That is, as shown in FIG. 11, the controller 110 detects the temperature of the wavelength converter 62 with the thermistor 54 (step S21). Then, the control unit 110 controls the temperature difference (detected temperature of the thermistor 54) with respect to the Peltier element 53 so that the temperature detected by the thermistor 54 becomes the temperature control temperature set value set in the above-described adjustment temperature setting process. and the temperature control temperature setting value) to heat or cool the wavelength converter 62 (step S22). Specifically, when the temperature detected by the thermistor 54 is lower than the temperature control temperature set value, the Peltier element 53 heats the wavelength converter 62 so that the temperature detected by the thermistor 54 is lower than the temperature control temperature set value. If it is high, the wavelength converter 62 is cooled by the Peltier element 53, and the temperature detected by the thermistor 54 is set to the controlled temperature set value. Therefore, the temperature of the wavelength converter 62 is maintained at the temperature control temperature set in each temperature range.

As a result, the internal temperature of the main body 101 deviates from the first temperature range and becomes the second temperature range or the third temperature range, and the phase matching condition is changed by a slight change in the incident angle of the first wavelength laser light to the wavelength converter 62. An increase in the amount of mismatch can be compensated for by adjusting the refractive index by controlling the temperature of the wavelength converter 62 . That is, as shown in FIG. 12, the adjustment deviation of the wavelength converter 62 caused by a slight change in the incident angle of the first wavelength laser beam to the wavelength converter 62 is reduced, and the output of the second wavelength laser beam is stabilized. It is possible to reduce the variability (variation coefficient). That is, the output stability (variation coefficient) of the second wavelength laser light can be enhanced. Note that FIG. 12 is a diagram showing the output stability (variation coefficient) of the second-wavelength laser light with respect to changes in the internal temperature of the main body 101 . As described above, according to the ophthalmic laser treatment apparatus 1 of the present embodiment, by changing the temperature control temperature of the wavelength converter 62 in each temperature region, the phase matching condition of the wavelength converter 62 can be adjusted in each temperature region. can meet. Therefore, suitable wavelength conversion can be performed in the wavelength converter 62 . In the present embodiment, the conversion efficiency of the wavelength converter 62 slightly decreases due to a slight change in the incident angle of the first wavelength laser beam to the wavelength converter 62. Experiments have confirmed that there is little effect on the output stability of laser light.

As a result, as shown in FIG. 13, regardless of the internal temperature of the main body 101, the output fluctuation width of the second wavelength laser light wavelength-converted by the wavelength converter 62 falls within a certain range. FIG. 13 is a diagram showing the fluctuation range of the output of the second wavelength laser light with respect to the internal temperature of the main body 101. As shown in FIG. In other words, by controlling the temperature of the wavelength converter 62 as described above, even in the second temperature range or the third temperature range outside the first temperature range, the output of the second wavelength laser light after wavelength conversion fluctuates. The width can be the same as the first temperature zone. As described above, the ophthalmic laser treatment apparatus 1 of the present embodiment is not easily affected by the environmental temperature, and can perform optimum wavelength conversion by the wavelength converter 62 to improve the output stability of the second laser light after wavelength conversion. can.

Further, in the ophthalmic laser treatment apparatus 1 of the present embodiment, the range in which the output stability of the second wavelength laser light can be maintained is increased. That is, it is possible to expand the temperature range in which stable second-wavelength laser light can be output. Therefore, according to the ophthalmic laser treatment apparatus 1 of the present embodiment, the output stability of the second wavelength laser light reaches a predetermined level in a short time after starting in the second temperature range deviating from the first temperature range toward the low temperature side. It falls within the range (for example, the output fluctuation is within ±20%). Therefore, for example, it is possible to greatly shorten the warm-up time from when the device is started until it becomes ready for use. In addition, even when the device is used for a long time in a third temperature range outside the first temperature range on the high temperature side, the patient's eye Ep can be easily irradiated with the second wavelength laser light whose output is stable.

It should be noted that the above-described embodiment is merely an example and does not limit the present disclosure in any way, and of course various improvements and modifications are possible without departing from the gist of the present disclosure. For example, in the above-described embodiment, in the temperature control of the wavelength converter 62, when the body portion 101 is in the second temperature range, it is set to be lower than the standard set value T0 by T1, and the body portion 101 is set to the third temperature range. If it is in the region, it is set higher than the standard set value T0 by T1. However, depending on the specifications of the laser treatment apparatus (for example, differences in the configuration of the irradiation optical system, etc.), contrary to the present embodiment, when the main body 101 is in the second temperature range, T1 If the main body 101 is in the third temperature range, it may be set lower than the standard set value T0 by T1.

Further, in the above embodiment, the temperature sensor 55 is arranged inside the main body 101, and the temperature control of the wavelength converter 62 by the temperature control unit 52 is performed based on the internal temperature of the main body 101 detected by the temperature sensor 55. However, it can also be implemented based on the environmental temperature, which has a correlation with the internal temperature of the main body 101 . For example, the temperature sensor 55 may be arranged on the circuit board in the control section 110 and the temperature control of the wavelength converter 62 by the temperature control unit 52 may be performed based on the temperature of the control section 110 detected by the temperature sensor 55 . can. Further, the temperature sensor 55 is arranged outside the cover of the main body 101, and the temperature control of the wavelength converter 62 by the temperature control unit 52 is controlled by the room temperature in which the ophthalmic laser therapy apparatus 1 is installed, which is detected by the temperature sensor 55. It can also be implemented based on Note that the method for changing the temperature of the wavelength converter 62 is not limited to the present disclosure. For example, instead of the CPU 111, a PLD (programmable logic device) or an analog circuit may be used. In other words, in this case, the PLD or analog circuit is changing means (control section) for changing the temperature of the wavelength converter 62 based on the detection result of the temperature sensor 55 . In addition, although the ophthalmic laser treatment apparatus 1 of the present embodiment incorporates the laser light source 11, the ophthalmic laser treatment apparatus may not include the laser light source as an example. For example, an optical fiber may be used to guide the first wavelength laser light to the second irradiation optical system. Also, for example, the ophthalmic laser therapy apparatus may not include the temperature sensor 55 . The ophthalmologic laser treatment apparatus may include acquisition means for acquiring temperature-related information (for example, room temperature), and the temperature information acquired by the acquisition means may be used to indirectly detect the ambient temperature of the laser irradiation optical system.

1 laser treatment apparatus 10 irradiation optical system 10A first irradiation optical system 10B second irradiation optical system 11 laser light source 52 temperature control unit 55 temperature sensor 62 wavelength converter 101 main body 110 controller Ep patient's eye

Claims (3)

In an ophthalmic laser treatment device that treats a patient's eye by irradiating it with a laser beam,
a laser light source that emits a first wavelength laser beam;
a laser irradiation optical system for irradiating a patient's eye with laser light emitted from the laser light source;
a wavelength converter provided in the laser irradiation optical system for converting the first wavelength laser light into a second wavelength laser light;
a temperature control unit that adjusts the temperature of the wavelength converter to a predetermined temperature control temperature;
a temperature detector that detects the ambient temperature of the laser irradiation optical system or the environmental temperature that affects the ambient temperature of the laser irradiation optical system;
A control unit that determines the controlled temperature of the wavelength converter based on the temperature detected by the temperature detector, and controls the temperature control unit so that the temperature of the wavelength converter reaches the determined controlled temperature. and
When the temperature detected by the temperature detector is out of a predetermined temperature range, the control unit generates a In the adjustment for satisfying the phase matching condition in the wavelength converter, the refractive index is adjusted so that the deviation due to the change in the incident angle of the first wavelength laser beam to the wavelength converter due to the thermal deformation of the support member becomes small. An ophthalmologic laser treatment apparatus, wherein the temperature control temperature of the wavelength converter is changed, and the temperature control unit is controlled so that the wavelength converter has the changed temperature control temperature. In the ophthalmic laser treatment device according to claim 1,
An ophthalmic laser treatment apparatus, wherein the temperature detector is arranged at a position spaced apart from the wavelength converter and detects a temperature inside the laser treatment apparatus. In the ophthalmic laser treatment apparatus according to claim 1 or claim 2 ,
The control unit stores table data for calculating the controlled temperature corresponding to the temperature detected by the temperature detector, and determines the controlled temperature based on the table data. for laser therapy.

Images