JPS59125551A - Microscope for ophthalmic operation - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ophthalmic surgical microscope, and particularly to an ophthalmic surgical microscope having a function of measuring the refractive power of an eye to be examined. The eye forms a sophisticated optical system, and if there is any disease in this system, it is necessary to take measures to restore its original function. That is, after some kind of surgery has been performed on the eyeball, reconstruction of the eyeball becomes an important issue. In particular, the recovery of eye refractive power after surgery is an important factor that determines the success or failure of the surgery, so the state of change in eye refractive power is measured not only after surgery but also during surgery to check whether it has been restored to its normal position. I need to know whether or not. The ophthalmological surgical microscopes conventionally used to perform this ophthalmic surgery only have observation and photographing functions for performing surgery, and a completely different method is required to measure the refractive state of the eye during or after surgery. I had to replace it with a new device. However, in addition to interrupting the surgery for a long time, it also required considerable effort, and the layout made it virtually impossible to perform full-scale measurements.

The present invention provides a novel ophthalmological surgical microscope that allows the surgical microscope to have a function of measuring eye refractive power, thereby allowing immediate eye examination as necessary to proceed with the surgery while confirming the status of the surgical operation. The purpose is to

According to the present invention, there is no need to provide means for aligning the eye refractive power measurement system and the eye to be examined using microscopic casting or observation. The present invention will be explained in detail below. FIG. 1 shows a first embodiment of the present invention, in which light from a lamp 1 for observing the anterior segment of the subject's eye is transmitted through a half mirror 2, a condenser lens 3. Lens with prism 4. After passing through the objective lens 5,
The anterior segment of the eye Ep to be examined is illuminated. The light from the anterior segment of the eye passes through the objective lens 5. Movable half mirror 14, relay lens group 6.
7,8. Flip-up mirror9. The light enters the observation eye E via the fixed mirror 10 and the eyepiece 11 and is observed.

When photographing the anterior segment of the subject's eye, the strobe 13 emits light to illuminate the anterior segment through the objective lens 5, and the light from the anterior segment passes through the objective lens 5. Movable half mirror 14, relay lens group 6,
7.8, the image passes under the flipped-up mirror 9, and is imprinted on a film or other image recording means 12. By the way, an eye refractive power measuring optical system is disposed in the optical path branched by the movable half mirror via the objective lens 5, and is movable relative to the eye to be examined in the optical axis direction integrally with the movable half mirror 14. Here, the optical system for measuring eye refractive power will be explained.

Light from a light source 20 for measuring eye refractive power illuminates a projection chart 18 through an objective lens 19 . This projection chart)1
8, slits 18a, 18b, 1 having at least three different directions with respect to the optical axis, as shown in FIG.
8c, and the light flux emitted from each of these is relay lens 1.
7. Half mirror 16, relay lens 15. The image passes through the movable half mirror z and the objective lens 5, enters the eye Ep to be examined, and is projected onto the fundus of the eye. The reflected light from the fundus is transmitted through an objective lens 5°, a movable half mirror 14, and a relay lens 15. To Half Mira16. Through the relay lens 21, the light is projected onto the light receiving chart 22 which is conjugate with the projection chart 18 with respect to the half mirror 16, and each slit 18a, 18b, 1 of the projection chart is projected.
The image light from 8c is transmitted to the slit 22a of the light reception chart 22 shown in FIG.

22b, 22c, and is detected by the light receiving elements 23a, 23b, 23c corresponding to each Surin F. Here, the movable half mirror 14 and the eye refractive power measuring optical system are moved relative to the eye to be examined Hp along the optical axis for observation, and the light receiving element 2
The best focused image position of each slit is detected from each output of 3a, 23b, and 23c, and the refractive power of the eye to be examined corresponding to each slit direction is determined from the amount of movement from the initial position to that position. Degree S, degree of astigmatism C9 astigmatism axis angle A'81-calculate.

That is, here, the refractive power of the eye to be examined is determined based on the fact that the output of the light receiving element is maximum when the projection chart 18 and the light receiving chart 22 are at a conjugate position with respect to the fundus. The calculation result of the refractive power of the eye to be examined is displayed on the image display element 24 as shown in FIG. This image display element 24 is provided with a projection lens 28 near the flip-up mirror 9, as shown in FIG. Set together with a small mirror 29,
Spherical refraction degree S, astigmatism degree C1, astigmatism axis angle Human data are observed with the subject's eye E together with the anterior segment of the subject's eye, and are also recorded on the image recording means 12.

Above we have described an example of the combination of the observation and photographing optical system for the subject's eye and the refractive power measuring means for the subject's eye, but it is also possible to use the movable half mirror in a fixed position and adjust the focus by moving other optical members. It is possible.

It is also possible to replace this with a wavelength division member and perform wavelength division for observation photography and refraction measurement. Furthermore, the mirror may be replaced by a prism. Furthermore, the movable half mirror
It can also be used as a flip-up mirror. Furthermore, the apparatus for measuring refractive power of the eye does not need to be automated, and may be a manually operated apparatus. As for the image display element 24, a display means such as cRT can be used, and means such as a half mirror, a half prism, a reversing mirror, etc. may be used to guide the image to the observation and photographing optical path. Furthermore, the results need not be displayed only in numbers, but may be displayed in the direction of maximum refractive power and the direction of minimum refractive power together with numerical values in those directions, as shown in FIG. - FIG. 6 shows a second embodiment of the present invention having an eye to be examined, an additional device for guiding the refractive power value to a TV image pickup tube and performing video recording 'As''9, replacing the fixed mirror 10 in FIG. A half mirror 25 is installed in the image pickup tube 27 through a photographing lens 26.
The anterior segment of the subject's eye and refractive power measurement data can be projected onto the screen.

Note that other image pickup devices such as a CCD may be used in place of the image pickup tube 27, and the half mirror 25 may be a flip-up mirror,
It may also be a half prism or the like.

FIG. 7 shows a third embodiment of the present invention, in which the optical path for illuminating the anterior ocular segment of the subject's eye, the optical path for observing and photographing the anterior ocular segment of the subject's eye, and the optical path for measuring eye refractive power are separated, and each of these optical paths is separated. The arrangement of the optical members is similar to the embodiment shown in FIG.

In this embodiment, all or part of the eye refractive power measurement optical system moves in the direction of its optical axis, detects the maximum output of the optical position detector corresponding to each slit, and determines the refractive power based on the amount of movement to that position. seek. Here, the outline of each optical system will be explained. Light from a lamp lot for observing the anterior segment of the subject's eye is transmitted through a half mirror 102, a condenser lens 103. The light from the anterior segment of the eye passes through the objective lens 105a and reaches the eye Ep, and then passes through the objective lens 105 and the relay lens 106 in the R direction and is observed. Further, during photographing, the strobe 113 emits light, and similarly, light from the anterior segment of the subject's eye advances in the R direction and is photographed.

On the other hand, regarding the eye refractive power measurement system, light passing through a projection chart (not shown) illuminated with infrared light passes through a relay lens 121. Half mirror 116, relay lens 1154 objective lens 1
05b, reaches the eye Ep to be examined, and is projected onto the fundus of the eye.

On the other hand, the light reflected from the fundus passes through the objective lens 105b, the relay lens 115, the half mirror 116, and the relay lens 117, and then travels in the direction D and is received by an optical position detector (not shown).

Note that in this embodiment, the optical path for illuminating the anterior segment of the eye to be examined is related to the optical path for observing and photographing the anterior segment of the eye to be examined, and does not need to be symmetrical to the optical path for measuring the eye refractive power. If it is symmetrical, the illumination light may be directly reflected at the anterior segment of the eye and enter the eye refractive power measurement system, but in this case, when measuring the eye refractive power, the lamp 101. strobe 11
By turning off the lights and combining the refractive power measurement system with the microscope, you can immediately observe and photograph the refractive power of the eye to be examined during surgery, allowing you to proceed with the surgery while constantly checking the condition of the eye to be examined. This allows you to keep records and track your progress and use it as a reference for your next surgery. Furthermore, by separating the wavelengths for observation photography and measurement, it is possible to eliminate interference with each other, making it possible to perform surgery and also to prevent noise during measurement.

Furthermore, since the refractive power measurement system can be aligned with respect to the eye to be examined through microscopic observation, there is no particular need to provide an alignment detection system to the refractive power measurement system.

[Brief explanation of drawings]

FIG. 1 is a diagram of a first embodiment of the present invention. FIGS. 2 and 3 are explanatory diagrams of a projection chart and a light reception chart, respectively. FIG. 4 is an explanatory diagram of an image display element that displays refractive power measurement data. FIG. 5 is an explanatory diagram of an image display element with a different display from that in FIG. 4. FIG. 6 is a diagram of a second embodiment of the present invention in which the anterior segment of the subject's eye is observed on a television monitor. FIG. 7 is a diagram of a third embodiment of the present invention. In the figure, Sha is the subject's eye, S is the spherical refraction, C is the degree of astigmatism, and A is the astigmatic axis angle. t and tot are lamps 5 for observing the anterior segment of the eye; 105, 105a and 105b are objective lenses 9; flip-up mirror 11 is eyepiece 12; image recording means 13; 113 is a strobe 14 is a movable half mirror; 18 is a projection chart 18a , 18b, 18c are the slits 20, the light source 22 for eye refractive power measurement is the light reception chart 22a, 22b, 22c are the slit 1, 23a, 23b, 23c are the light receiving elements 24, the image display element 25 is the half mirror, and 27 is the image pickup tube. . Applicant Canon Co., Ltd. 2

Claims (1)

[Scope of Claims] l. A means for illuminating the anterior ocular segment of the subject's eye, and a means for observing or photographing the illuminated anterior ocular segment of the subject's eye. Microscope for ophthalmic surgery 1゜2, characterized by having means for projecting an index light beam onto the fundus of the eye to be examined, and means for measuring the eye refractive power by receiving the reflected light of the index light beam from the fundus of the eye to be examined. An ophthalmic surgical microscope according to claim 1, wherein the eye refractive power is measured by moving the projection index position and the fundus reflected light receiving position relative to the fundus and detecting the amount of movement until they become mutually conjugate positions. e! ,mirror. 3. The ophthalmic surgical microscope according to claim 1, wherein the indicator has slits in at least three directions. 4. The ophthalmic surgical microscope according to claim 3, wherein the spherical refractive power, the dioptric power, and the astigmatic axis angle are calculated by measuring the eye refractive power in at least three directions. 5. The ophthalmic surgery microscope according to claim 4, which is provided with an image display means for displaying the eye refractive power measurement data, and for observing or photographing the eye refractive power measurement data together with the anterior segment of the eye to be examined. 6. The ophthalmic surgery microscope according to claim 5, which is equipped with an imaging tube and is capable of video observation and recording. 7. An optical path for observing or photographing the anterior segment of the subject's eye. The ophthalmic surgical microscope according to claim 1, wherein the optical paths for measuring the eye refractive power partially overlap and the optical paths are branched by a wavelength division member. 8. The ophthalmic surgery microscope according to claim 1, which blocks illumination light for observing or photographing the anterior segment of the subject's eye during eye refractive power measurement.