JP3809267B2 - Ophthalmic imaging equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ophthalmologic photographing apparatus used in an ophthalmic clinic or a mass examination.
[0002]
[Prior art]
Conventionally, a fundus camera that provides a light source for guiding the eye to be examined to a desired imaging region and causes the subject to fixate the light source to image the desired region of the eye to be examined is disclosed in, for example, Japanese Patent Laid-Open No. 8-308802. Known in publications and the like.
[0003]
FIG. 5 shows a configuration diagram of this conventional fundus camera. On the optical path behind the objective lens 1 facing the eye E, a perforated mirror 2 having an opening at the center, a photographing lens 3, and a rotatable lens. The mirror 4 is arranged, and in the fixation optical system above the mirror 4, a relay lens 5, a liquid crystal display 6 for fixing the eye E to be examined, and a light source 7 are arranged. A field lens 9, a field stop 10, an imaging lens 11, and an imaging unit 12 are arranged on the optical path behind the mirror 4, and a lens 13 and a ring stop are provided on the optical path in the incident direction of the perforated mirror 2. 14, a light source 15 is arranged, and the ring diaphragm 14 is arranged substantially conjugate with the perforated mirror 2 with respect to the lens 13. The output of the imaging means 12 is connected to the control means 16, the output of the control means 16 is connected to the television monitor 17, and the outputs of the photographing switch 18 and the fixation target moving switch 19 are connected to the control means 16, respectively. Yes.
[0004]
The examiner turns on the desired position of the liquid crystal display 6 in order to photograph the desired portion of the eye E. At this time, the position information of the liquid crystal display 6 is converted into an electrical signal, and a character C is generated at a position based on the information as shown in FIG. The character C is combined with the fundus oculi image Pr and displayed on the observation screen of the television monitor 17, and allows the examiner to visually observe the character C. Here, the circle S in the television monitor 17 represents the approximate visual field of the eye E to be examined. Further, when changing the desired part, for example, the fixation target moving switch 19 such as a cross key is operated to move the lighting position on the liquid crystal display 6. In conjunction with this, the character C also moves on the observation screen.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional example, matching the fixation target presentation range to the visual field range in which the subject's eye can be fixed not only makes position adjustment difficult, but also complicates the apparatus, and thus generally covers the entire visual field range. Therefore, the fixation target moving range to be presented is set larger than the visual field range. Furthermore, since the left and right eyes are combined with the same fixation target, for example, even when photographing the right eye, if the fixation target moves outside the visual field of view or a position unnecessary for normal fixation, From there, it must be returned to the desired fixation position. These operations are troublesome for the photographer and are extremely troublesome.
[0006]
An object of the present invention is to provide an ophthalmologic photographing apparatus that can solve the above-described problems and can move a display range of a fixation target within a predetermined range in a visual field of an eye to be examined.
[0007]
[Means for Solving the Problems]
Ophthalmic imaging apparatus according to the present invention for achieving the above object, the fixation target presenting means presentable fixation target at any position in the field of view of the eye, controls the solid target display means Control means for storing an address of the fixation target corresponding to the visual field range of the eye to be examined in advance, and the control means determines the presentation position of the fixation target based on the address when moving the fixation target. It is characterized by limiting .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described in detail based on the embodiment shown in FIGS.
FIG. 1 is a block diagram of the first embodiment. On the optical path behind the objective lens 21 facing the eye E, a perforated mirror 22 having an opening at the center, a photographing lens 23, and a rotatable lens. An imaging lens 25, a liquid crystal display 26, and a light source 27 are arranged in the fixation optical system above the mirror 24, and a field lens 28, a field stop 29, and an image are formed behind the mirror 24. A lens 30 and an imaging means 31 are arranged. A lens 32, a ring diaphragm 33, and a fundus observation light source 34 are arranged on the optical path in the incident direction of the perforated mirror 22, and the ring diaphragm 33 is substantially conjugate with the perforated mirror 22 with respect to the lens 32. Has been placed. The output of the imaging means 31 is connected to the control means 35, and the output of the control means 35 is connected to the television monitor 36. The output of the control means 35 is connected to the liquid crystal display 26, the photographing switch 37, and the fixation target moving switch 38.
[0009]
In such a configuration, the light beam emitted from the fundus oculi observation light source 34 passes through the opening of the ring diaphragm 33 and the lens 32, is reflected leftward by the mirror portion of the perforated mirror 22, passes through the objective lens 21, and the eye to be examined. Illuminate E fundus Er. The reflected light beam from the fundus Er passes through the pupil Ep, the objective lens 21, the aperture of the perforated mirror 22, the photographing lens 23, and the field lens 28, and once forms a fundus image near the field stop 29, and forms an imaging lens. The image is formed again on the imaging means 31 by 30. The fundus oculi image Pr formed on the image pickup means 31 is converted into a video signal and displayed on the television monitor 36 via the control means 35.
[0010]
The photographer observes the fundus moving image displayed on the television monitor 36, adjusts the photographing lens 23 to aim the fundus image Pr, and further images a desired part of the eye E to be examined. The movement switch 38 is operated. The television monitor 36 displays a screen similar to that of the conventional example shown in FIG. 6, and the examiner guides the eye E to a desired site, and then presses the photographing switch 37 to emit the fundus observation light source 34, Pr is recorded as a still image in the storage means inside the control means 35. FIG. 2 shows the positional relationship between the opening cell 26a and the light shielding cell 26b of the liquid crystal display 26 at this time.
[0011]
FIG. 3 shows the liquid crystal display 26 as viewed from the eye E, and the range surrounded by the circle S is within the field of view of the eye E. Here, an address of the fixation target (a visual field range of the eye to be inspected, a desired position of the left and right eyes, etc.) is stored in the control means 16 in advance, and a fixation is made at a position not desired by the examiner, for example, the outer cell 26c of the circle S Even if the mark moving switch 38 is operated, the opening cell 26a does not move. Alternatively, when the fixation target moving switch 38 is operated outside the circle S, the opening cell 26a may be automatically moved to the reset position, for example, the center of the fixation target.
[0012]
FIG. 4 shows a front view of the fixation target of the second embodiment. Instead of the liquid crystal display 26, an LED array 40 in which a plurality of LEDs are arranged is used, and the LED array 40 is turned on / off to fix the fixation. The position is changed, and the lighting part 40a and the extinguishing part 40b are shown.
[0013]
Even in this case, the lighting part 40a does not move outside the circle S.
[0014]
【The invention's effect】
As described above, the ophthalmologic photographing apparatus according to the present invention cannot move the fixation target to a position unnecessary for fixation of the examinee, so that the fixation position is within the range even if the examiner makes a mistake. Therefore, the movement for correction is minimal, and ophthalmic photography can be performed efficiently.
[Brief description of the drawings]
FIG. 1 is a side view of an ophthalmologic photographing apparatus according to a first embodiment.
FIG. 2 is a front view of a fixation target.
FIG. 3 is a front view of a fixation target.
FIG. 4 is a front view of a fixation target of the second embodiment.
FIG. 5 is a side view of a conventional ophthalmologic photographing apparatus.
FIG. 6 is an explanatory diagram of an observation screen for an eye to be examined.
[Explanation of symbols]
26 Liquid crystal display 27, 34 Light source 29 Field stop 31 Imaging means 35 Control means 36 Television monitor 37 Shooting switch 38 Fixation target movement switch 40 LED array

Claims (4)

Fixation target presenting means capable of presenting a fixation target at an arbitrary position in the visual field range of the eye to be examined, and controlling the fixation target presenting means, and pre-assigning an address of the fixation target corresponding to the visual field range of the eye to be examined An ophthalmologic photographing apparatus characterized in that the control means limits the presentation position of the fixation target based on the address when moving the fixation target .   The ophthalmologic photographing apparatus according to claim 1, wherein the fixation target is combined with an electric signal and displayed on an observation display unit for an eye to be examined.   The ophthalmologic photographing apparatus according to claim 1, wherein the fixation target presenting unit is a liquid crystal display.   The ophthalmologic photographing apparatus according to claim 1, wherein the fixation target presenting unit is a light source in which a plurality of LEDs are arranged.

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