JPS60253429A - Ophthalmic examination apparatus - 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 ophthalmological examination device for qualitatively diagnosing eye misalignment such as strabismus and strabismus, and for quantitatively diagnosing these.

Eye position, which indicates the mutual positional relationship of the two eyes, is determined by optomotor reflexes such as fusion, tension in the extraocular part due to convergence, dilation, or accommodation, or anatomical changes in the eyeball, orbit, and extraocular part. It depends on the conditions etc. When this eye position becomes abnormal due to systemic, traumatic, or accommodative factors, resulting in strabismus or strabismus, it causes pain such as eye strain. Conventionally, the cover test, cover-uncover test, and alternate cover test are known as methods for testing eye position deviations such as strabismus and strabismus, but all of these tests This is done by looking at the movement of the line of gaze associated with continuous intervals and continuous interval removal. Therefore, with these conventional methods, there is a problem in that continuous eye conditions cannot be observed and only qualitative tests can be performed.

The purpose of the present invention is to solve such conventional problems, to enable continuous observation of the eyes even when the eyes to be examined are continuously connected, and to enable quantitative measurements as well as qualitative examinations.
The purpose is to provide an ophthalmological examination device that enables accurate diagnosis, and its gist is to provide an ophthalmological examination device that can operate independently in front of the fixation target fixed by the eye to be examined, and in front of both the left and right eyes of the eye to be examined. The present invention is characterized by comprising a light amount attenuation means, and an imaging device that images and displays the anterior segment of the eye to be examined, whether the attenuation function by the light amount attenuation light blocking means is stopped or activated.

EMBODIMENT OF THE INVENTION Below, this invention is demonstrated in detail based on the Example of illustration.

FIG. 1 shows a first embodiment of the present invention, in which Ea
, Eb represents the left eye and right eye of the eye to be examined.

Here, the left eye Ea faces the fixation direction a, and the right eye Eb faces the fixation direction A. In front of these left eye Ea and right eye Eb,
In this embodiment, infrared filters 1.2 that block visible light and transmit infrared light are removably arranged as light blocking means that can operate independently. Also,
In the embodiment, a first semi-transparent mirror 3 is tilted behind an infrared filter 2 of the right eye Eb, a projection lens 4 is placed on the reflection side of the first semi-transparent mirror 3, and a second semi-transparent mirror 5 is placed diagonally and is sensitive to infrared light. The image pickup tubes 6 having the following configurations are sequentially arranged. The output of the image pickup tube 6 is displayed on a television monitor 7. Furthermore, on the side of the second semi-transparent mirror 5 in the direction of incidence into the image pickup tube 6, a relay lens 8, a chart 9, and a light source 1O are arranged in this order.

As shown in FIG. 2, the chart 9 depicts indicators S that are combined by a plurality of radial lines and lines forming a plurality of concentric rings. This chart 9 is illuminated by a light source IO and is projected as an index image Sa onto the imaging surface of the image pickup tube 6 via the relay lens 8 and the 20th semi-transparent mirror 5. on the other hand,
The anterior segment of the right eye Eb is projected onto the imaging surface of the imaging tube 6 by the projection lens 4 via the first semi-transparent mirror 3.

Now remove the infrared filter l in front of the left eye Ea, and remove the infrared filter l in front of the left eye Eb.
When the infrared filter 2 is inserted in front of the right eye Eb, the right eye Eb loses its fixation target, but the image pickup tube 6 captures the anterior segment of the eye and images it on the television monitor 7. If the pupil P of this projected anterior eye segment image moves to the position of Pa when the infrared filter 2 is removed in the 0th order, the index image The direction and amount of movement can be detected by changes on Sa.

Note that instead of using the chart 9, the movement of the pupil may be detected from changes in the brightness level signal on the scanning line.

Further, the light source 10 emits light that is sensitive to the image pickup tube 6, and is not limited to an infrared light source.

The above is an example in which observation and measurement are performed with only one eye, but an example in which both the left and right eyes Ea and Eb can be observed simultaneously is shown in Fig. 3, and Fig. 4 seen from the side of Fig. 3. This is an indication. In this embodiment, the left eye Ea and the right eye Eb are made to gaze at the fixation target 11, and at this time, the anterior segment of the left eye Ea is imaged by the projection lens 15 via the semi-transparent mirror 12, the mirror 13, and the reflective prism 14. The image is projected onto the imaging surface of the tube 6. Similarly, the anterior segment of the right eye Eb is also projected onto the imaging surface of the imaging tube 6 by the projection lens 15 via the semi-transparent mirror 12, mirror 16, and reflection prism 14. Further, as in the previous embodiment, infrared filters 1 and 2 are independently and removably arranged in front of the left and right eyes Ea and Eb as light shielding means.

In this embodiment, first, when converting from a state where the right eye Eb is continuous and the left eye Ea is open to a state where the left eye Ea is continuous and the right eye Eb is open, the eye to be examined has, for example, external tropism. given that,
As shown in FIG. 5, the pupil of the subject's eye on the television monitor 7 is located from the position Pi of the right eye Eb and the position Ql of the left eye Ea to the right eye E.
Move to position P2 of b and Q2 of left eye Ea. It is also conceivable to further alternate, for example, to move the series again to the right eye Eb. Note that it is also possible to perform similar measurements by freely moving the fixation target 11 in the direction of the eye to be examined as shown in 11a.

On the television monitor 7, in addition to displaying a chart similar to the chart 9 of the embodiment shown in FIG. 1, a chart similar to that shown in FIG. It may be displayed in text or figures as shown, or
The movement of the pupil is detected by measuring the coordinate position based on the density of the brightness level signal on the scanning line, and the amount of movement is detected, and the right eye is horizontally shifted by 2 mm on the TV monitor 7, as shown in FIG. In that case, rR, Eg, r180”J
, r2MMJ can also be expressed and quantified.

In addition, the infrared filter l used in the above embodiments,
2 may be replaced by an optical path splitting means such as a semi-transparent mirror, or a gicchroic mirror that transmits visible light and reflects infrared light may be used instead of the semi-transparent mirror 12 of the second embodiment.

FIG. 6 shows a means for changing the amount of transmitted light that electro-optically changes the transmittance using a liquid crystal shutter, a polarizing plate, etc. instead of the infrared filter 1.2 shown in FIG. 17.18 is shown. In this case, the incident light from the fixation target to the eye to be examined can be controlled by the semi-transparent mirror 12 and the transmitted light amount variable means 17 and 18.

As explained above, the ophthalmological examination device according to the present invention is capable of constantly grasping the direction of gaze during the occluded test of the subject's eye, and is also capable of quantitative measurement, and is capable of detecting binocular vision functions such as strabismus and strabismus. This can have a great effect on accuracy inspection.

[Brief explanation of the drawing]

The drawings show an embodiment of the ophthalmological examination apparatus according to the present invention, and FIG. 1 is an optical layout diagram of the first embodiment, FIG. 2 is a front view of a chart, and FIG. 3 is a diagram of the second embodiment. optical layout diagram,
Figure 4 is an optical layout diagram of the second embodiment viewed from the side;
The figure is a front view of a television monitor, and FIG. 6 is a configuration diagram of another embodiment for blocking the area in front of the eyes. Code l, 2 is an infrared filter, 3.5.12 is a semi-transparent mirror, 4
．． 15 is a projection lens, 6 is an image pickup tube, 7 is a television monitor,
9 is a chart, IO is a light source, 11 is a fixation target, 17.1
8 is a means for varying the amount of transmitted light. Patent applicant Canon Co., Ltd. 1st W! J

Claims (1)

[Scope of Claims] 1. A fixation target fixed by the eye to be examined, a light amount attenuation means that can operate independently in front of the left and right eyes of the eye to be examined, and stopping the attenuation function by the light amount attenuation means. - An ophthalmological examination device characterized by being equipped with an imaging device that images and displays the anterior segment of the eye to be examined in any case of operation. 2. The ophthalmological examination apparatus according to claim 1, wherein an infrared filter is used as the light amount attenuation means, and the eye to be examined is imaged through the infrared filter. 3. The ophthalmological examination apparatus according to claim 1, wherein a transmitted light amount variable means for electro-optically changing transmittance is used as the light amount attenuation means. 4. The ophthalmological examination device according to claim 1, which also includes an index for measuring the movement of the eye to be examined.