JPH084572B2 - Eye refractive power measuring device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an eye-refractive-power measuring device, and more particularly, to an eye-refractive-power measuring device for accurately measuring the eye-refractive power even with respect to an eye to be examined having a cloudy portion in the pupil region. Regarding

[Prior Art] Conventionally, an eye refractive power measuring device that illuminates the anterior segment of the eye by an anterior segment illumination system that illuminates the anterior segment of the subject's eye in a wide range and observes the anterior segment of the subject's eye to perform alignment. known.

[Problems to be Solved by the Invention] However, in the conventional example, the pupil area of the eye to be inspected is observed as a dark area, and if there is an opaque area in a part of the pupil area due to a cataract, that area becomes slightly bright, and the pupil area of the eye to be inspected becomes slightly bright. It was difficult to observe the cloudiness of the area.

And even if the measurement index light flux strikes the turbid area, there is almost no difference from the case where the turbidity area becomes slightly brighter and does not reach the turbidity area. There was a problem that measurement could not be performed, or even if it was possible, measurement accuracy was poor.

In the above conventional example, the measurement index light beam reflected by the eye to be inspected is wavelength-separated from the anterior segment illumination light beam, and therefore is not guided to the anterior segment observation system.

It is an object of the present invention to provide a new eye refractive power measuring device that solves the above-mentioned problems.

[Means for Solving the Problems] According to the present invention for achieving the above object, the eye to be inspected is illuminated with light from the light source for measuring eye refractive power, and the light from the eye is received to measure the eye refractive power. An eye refractive power measurement device comprising an anterior ocular segment imaging unit capable of observing an anterior ocular segment of an eye to be inspected in order to perform alignment of the eye to be inspected with
It has an illuminating means for illuminating the fundus of the eye to be examined through a pupil of the eye to be inspected with light from a light source different from the light source for measuring the eye refractive power, and the anterior segment imaging of the reflected light from the fundus of the eye to be inspected illuminated by the illuminating means. It is characterized in that the pupil part of the eye to be inspected can be observed by the anterior segment imaging unit.

Further, in addition to this, according to the present invention for achieving the above object, for performing eye refractive power measurement by illuminating the eye to be inspected and receiving light from the eye to be inspected by the detection means for eye refractive power measurement. An eye refractive power measuring device comprising an anterior ocular segment imaging unit capable of observing an anterior ocular segment of an eye to be aligned with an optical eye examining unit, and a detecting unit for measuring the eye refractive power. The anterior ocular segment imaging unit is separately provided, and has an illumination unit that illuminates the fundus of the eye to be inspected through the pupil of the eye to be inspected, and the reflected light from the fundus of the eye to be inspected illuminated by the illumination unit is directed to the anterior segment imaging unit. It is characterized in that the pupil part of the eye to be inspected can be observed by the anterior segment imaging means.

[Embodiment] FIG. 1 shows an embodiment of the present invention. Reference numeral 1 denotes an index light source for measuring eye refractive power which is provided on the optical axis, and includes a lens 2, a diaphragm 3 having a central aperture conjugate with the pupil E _{p of the} eye E, a perforated mirror 4 in the vicinity thereof, and a light beam. The index light source 1 is projected onto the fundus E _r via the dividing members 5 and 6 and the objective lens 7. The fundus reflected light is reflected by the reflecting surface of the return-perforated mirror 4 along the same optical path, and the diaphragm 8 conjugated to the pupil E _p (six apertures 81 to 86 at equal intervals on the same circumference).
, A lens 9, a separation prism 10 (each opening 81 to 86).
The light flux from the optical axis 17 is deflected in a direction separating from the optical axis 17) and is projected onto the area array sensor 11 which is conjugate with the fundus E _r . Light fluxes 101 to 106 projected on the area array sensor 11
Is shown in FIG. The eye refractive power is calculated from the positional relationship of these light fluxes.

By the way, 14 is an infrared television camera for alignment, and the pupil area is projected on it as shown in FIG. Polarization filter 15 the infrared light from the light source 16 provided on the optical axis in a turbid observation light dividing member 5, 6, lens 7 condenses in pupil E _p over the optical axis position of the pupil E _p The fundus _Er is illuminated from. The reflected light from the fundus _Er illuminates the lens El from behind. Since the cataract opaque part does not transmit light, the part 18 reflected on the infrared TV camera 14 is the second part.
It becomes dark as shown. And, except the cloudy part, it looks bright. In FIG. 1, the polarization filter 13 allows only polarized light perpendicular to the polarization filter 15 to pass through. Since the corneal reflection is specular reflection and the polarization state is maintained, the corneal reflected light does not pass through the polarization filter 13 and a pupil image that is easy to see is obtained. Without these polarization filters 13 and 15, the bright spot of the light source 16 due to corneal reflection is reflected, but the pupil area may be observed in the state where the bright spot is reflected.

When the index light flux is not in the opaque part of the eye pupil during alignment, the opaque part of the eye pupil can be recognized as a dark part in the bright background. The turbid area becomes bright and can be easily identified. Therefore, the examiner is slightly perpendicular to the optical axis of the slide table 30 while watching the image of the television camera 14 so that the light flux emitted from the light source 1 for measuring the eye refractive power and entering the eye to be inspected avoids the opaque portion of the pupil of the eye to be inspected. The eye refractive power can be measured after the displacement in the direction.
The video signal from the TV camera 14 is electrically detected and the sliding base
It is also possible to automate 30 displacements.

By the way, in the above-described embodiment, the light use efficiency is higher when the light sources 1 and 16 have different wavelengths in the infrared region. In this case, the light splitting member 5 transmits the light from the light source 1 and transmits the light from the light source 16. The light splitting member 6 has a function of reflecting the light from the light source 1, and a function of partially transmitting and partially reflecting the light from the light source 16. Further, the image pickup tube of the television camera 14 and the area array sensor 11 do not necessarily have to be provided in separate cylinders. That is, after passing through the pupil region and reflected by the light splitting member 6 so as to form a pupil region in the area array sensor 11,
The pupil area observation system may be provided with a detoured optical path in which a light splitting member is provided at a position where the optical path is bent by a mirror (not shown) and further merges with the optical axis 17.

Next, FIG. 4 shows a modification of the embodiment shown in FIG.
A polarization beam splitter 20 is provided in place of 3,15.
The polarization beam splitter 20 has a function of transmitting the P component and reflecting the S component, and can remove the corneal reflection to form an easy-to-see pupil image. In the above-described embodiment, the light source 16 is provided separately from the light source 1, but since the diaphragm 3 having an opening on the optical axis is conjugate with the eye pupil to be inspected, the light source 1 has the function of the light source 16 and the light source 16 is removed. You can also do it. In this case, the light splitting member 6 has a function of partially transmitting and partially reflecting light from the light source 1.
The light that has exited from and reflected by the fundus is reflected by the light splitting member 6 so that the pupil area can be observed.

[Effects] As described above, according to the present invention, it is possible to perform the alignment so that the measurement light flux is not involved in the opaque portion of the eye to be inspected, which is convenient for measuring the eye refractive power of the eye to be inspected with cataract.

In particular, in the present invention, eye refraction measurement is performed by observing the pupil part of the eye to be inspected by fundus reflected light, and by making the light source or the detection side separate, it is possible to perform measurement and observation with more appropriate sensitivity, respectively, and to perform alignment. Can be done more efficiently.

[Brief description of drawings]

1 is a diagram of an embodiment of the present invention, FIG. 2 is a diagram showing a pupil region image, FIG. 3 is a diagram showing a light beam for measuring eye refractive power on an area array sensor, and FIG. 4 is a diagram showing FIG. A diagram showing a modified example, in which 1 is a light source for measuring eye refractive power, 6 is a light source for observing a pupil region, 11 is an area array sensor 13, 15 is a polarizing filter 14, 14 is an infrared television camera, 20 is a polarizing beam splitter.

Claims (3)

[Claims] 1. An optical optometry means for illuminating an eye to be inspected with light from a light source for measuring eye refractive power and receiving light from the eye to be inspected to align the eye with the optical optometry means. An eye refractive power measuring device comprising an anterior ocular segment imaging means capable of observing an anterior ocular segment of an eye to be inspected, illuminating a fundus of the eye to be inspected through a pupil of the eye to be inspected with light from a light source different from the light source for measuring eye refractive power. Characterized in that the reflected light from the fundus of the subject's eye illuminated by the illuminating unit is guided to the anterior segment imaging unit, and the pupil of the subject's eye can be observed in the anterior segment imaging unit. A device for measuring eye refractive power. 2. An eye for illuminating the eye to be inspected and receiving light from the eye to be inspected by a detection means for measuring eye refractive power so as to align the eye with the optical eye examining means for measuring eye refractive power. An eye refractive power measuring device comprising an anterior ocular segment imaging unit capable of observing an anterior ocular segment of an eye, wherein the detecting unit for measuring the eye refractive power and the anterior ocular segment imaging unit are separately provided, and an eye to be inspected An illumination means for illuminating the fundus of the eye to be inspected through the pupil is provided, and reflected light from the fundus of the eye to be inspected illuminated by the illumination means is guided to the anterior segment imaging means, and the pupil part of the eye to be inspected in the anterior segment imaging means. An eye refractive power measuring device characterized by being observable. 3. The eye refractive power measuring device according to claim 2, wherein said illuminating means is also used for measuring eye refractive power.