JPH07136119A - Ophthalmologic apparatus - Google Patents

Abstract

PURPOSE:To achieve a fully automatic optometric operation by performing a positioning between an eye to be inspected and the apparatus automatically. CONSTITUTION:A reflected luminous flux from an anterior ocular segment with a lighting source 90 passes through an objective lens 4 to form an image on a TV camera 8. At this point. a reflection image of cornea is extracted to determine a deviation of an eye E to be inspected from an optical axis A. Based on the results, a stepping motor 13 of a jaw receiving base 12 and a drive section thereof 3 are driven by a control section 10 to perform a positioning.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic apparatus used as an optometry apparatus in an ophthalmological clinic or an eyeglass store.

[0002]

2. Description of the Related Art Conventionally, alignment of an ophthalmologic apparatus such as an autorefractometer, a keratometer, a tonometer, and a fundus camera is performed by fixing the examinee's head on the forehead and fixing it to a chin rest so that the examiner uses the optometry system. Move the mounted slide base with the operation stick,
The position of the eye of the subject and the optical axis are matched. However, it takes time for the examiner to perform accurate alignment while observing the anterior segment of the subject, which causes fatigue of the subject. For this reason, there has been devised a device that automatically adjusts the position after the examiner has adjusted the position to some extent with the operation stick.

[0003]

However, in the automatic positioning as in the above-mentioned conventional example, accurate positioning is difficult unless the examiner is constantly monitoring, and it is particularly difficult to adjust the height of the chin rest. The present situation is that the examiner manually performs the observation while observing the anterior segment of the subject.

The object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide an ophthalmologic apparatus capable of automatically aligning the eye to be inspected with the apparatus.

[0005]

An ophthalmologic apparatus according to the present invention for achieving the above object comprises a face fixing means for fixing the face of a subject, an anterior segment illumination light source, and an anterior segment imaging television. In an ophthalmologic apparatus including an optometry unit including an optical system and an optometry system, a driving unit that drives the optometry unit is provided, and a control unit that controls the driving unit based on a signal of the imaging television system is provided. Is characterized by.

[0006]

In the ophthalmologic apparatus having the above-mentioned structure, the anterior segment is illuminated by the illumination light source, the anterior segment image is taken by the television camera,
This signal is input to the control means, and the eye examination unit is driven based on the output from this control means to align the eye to be inspected with the eye examination optical system.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. FIG. 1 shows a configuration diagram of a first embodiment, in which an optometry unit 2 is provided in front of an eye E to be inspected in the vicinity of the center in a housing 1.
A drive unit 3 that moves the optometry unit 2 three-dimensionally is attached to the lower portion of the optometry unit 2. Eye E to be examined by the optometry unit 2
The objective lens 4, the dichroic mirror 5 and the optometry optical system 6 are arranged in the optical axis A direction in front of, and the television camera 8 is arranged in the reflection direction of the dichroic mirror 5 via the imaging lens 7. . An illumination light source 9 that illuminates the anterior segment of the eye E and its surroundings is provided around the objective lens 4. Although the illumination light source 9 is drawn in the vertical direction of the optical axis A in the figure, it is actually provided in the horizontal direction of the objective lens 4.

The output of the television camera 8 is connected to a control section 10 including a computer and the like provided in the housing 1. Further, a forehead rest 11 is attached to the upper portion of the housing 1, a jaw rest 12 is attached to the lower portion of the housing 1, and the jaw rest 12 is stepped to move the jaw rest 12 in the vertical direction. The motor 13 is connected. Further, the output of the control unit 10 is connected to the stepping motor 13 and the drive unit 3.

In the above structure, the reflected light from the anterior segment of the eye E illuminated by the illumination light source 9 passes through the objective lens 4 and is reflected by the dichroic mirror 5, and the television camera 8 through the imaging lens 7. To form an anterior ocular segment image.
On the other hand, the light beam for eye examination from the eye examination optical system 6 passes through the dichroic mirror 5, passes through the objective lens 4, and reaches the eye E to be examined.

FIG. 2 shows an anterior segment image E'of the subject's eye E transferred to the television camera 8. In this image E ', the illumination light source 9
The corneal reflection image 9'of is also reflected. There are individual differences in the size of the face, and it is necessary to have a large adjustment range in the vertical direction, and use the screen vertically as shown in FIG. 2 to prevent the inspected eye image E ′ from falling off the screen. Is preferred. Further, the rough adjustment of the position is first performed at the top and bottom of the chin rest 12, and after the top and bottom are aligned to some extent, the drive unit 3 is driven to accurately align the front, rear, top, bottom, left and right. The adjustment of the optical axis A in the front-rear direction is performed in a blurred state of the corneal reflection image 9 ', and the drive unit 3 is moved so that the center of the reflected image 9'is located at the center of the optical axis A at the position where it is not blurred.

The specular reflection of the cornea is much stronger than the reflection from other parts. Therefore, a predetermined threshold value can be determined and only this corneal reflection image 9'can be extracted as shown in FIG. The control unit 1 as an image signal based on the position of FIG.
0 is input to the computer and calculation is performed to determine the shift of the eye E to be inspected with respect to the optical axis A of the optical system. Based on the calculation result, the stepping motor 13 of the chin rest 12 and the three-dimensional drive unit 3 of the eye examination unit 2 are driven to perform alignment so that the eye E to be inspected is at a predetermined position with respect to the eye examination unit 2. .

The image received by the television camera 8 may be displayed on a television monitor or the like, and adjustment may be performed while observing the television monitor image. With this method, when the eyelid is covered, an appropriate treatment such as opening the eyelid by hand can be performed, and it is also possible to monitor whether or not the alignment is reliable.

By providing two illumination light sources 9 on the right and left sides of the optical axis, two corneal reflection images are generated and more accurate recognition can be performed than in the case of one image, and images having substantially the same light quantity are generated at substantially constant intervals. It is possible to distinguish from other reflected light.

FIG. 4 is a block diagram of the second embodiment.
The same reference numerals as indicate the same members. In the second embodiment, the chin rest 12 is not used, and the forehead support 14 attached to the upper part of the housing 1 is connected to the stepping motor 15 and is movable in the optical axis A direction. Further, the illumination light source 16 for illuminating the anterior segment is attached to the housing 1, and other configurations are the same as those in the first embodiment.

In this case, the forehead support 14 is driven by the stepping motor 15 to adjust the position in front of the eye E to be examined in the optical axis A direction. The anterior segment of the eye E to be examined is illuminated by the illumination light source 16 and the same operation as in the first embodiment is performed.

FIG. 5 shows an image E'of the subject's eye image reflected on the television camera 8, and in this embodiment, it is not the corneal reflection image but the pupil image E '.
p'is extracted, and FIG. 6 shows the extracted pupil image Ep '. The alignment can be known from the positional relationship between the optical axis A and the pupil image Ep ′, and the driving unit 3 is driven to move the position of the optometry unit 2 so that the center of the pupil image Ep ′ coincides with the optical axis A. Adjust.

Illumination light source 1 obliquely with respect to eye E to be inspected
When illumination is performed by 6, the reflection from the fundus does not occur, so the inside of the pupil Ep becomes darker than that of the other anterior ocular segment and the level of the video signal becomes low, so that the control unit 10 can perform detection. . Since the pupil image Ep 'is a circle having a certain size, it is easy for the computer to recognize.

As in the first embodiment, it is possible to know whether the position of the pupil image Ep 'in the direction of the optical axis A is correct in the blurred state of the pupil image Ep'. Good.
When the distance required for driving is large, the forehead support 14 may be driven first.

[0019]

As described above, the ophthalmologic apparatus according to the present invention drives the optometry section based on the light reception signal of the anterior segment image,
Since the alignment of the eye to be inspected and the optometry optical system is performed automatically,
The examiner is relieved of the alignment operation, and the automatic alignment can be performed without depending on the eye to be inspected, and the fully automatic eye inspection can be performed.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment.

FIG. 2 is an explanatory diagram of an anterior ocular segment image.

FIG. 3 is an explanatory diagram of a corneal reflection image.

FIG. 4 is a configuration diagram of a second embodiment.

FIG. 5 is an explanatory diagram of an anterior ocular segment image.

FIG. 6 is an explanatory diagram of a pupil image.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 case 2 optometry part 3 drive part 6 optometry optical system 8 TV camera 10 control part 11, 14 forehead support 12 chin rest 13, 15 stepping motor

Claims (2)

[Claims] 1. A face fixing means for fixing a face of a subject,
An ophthalmologic apparatus including an anterior ocular segment illumination light source and an anterior ocular segment imaging television system and an optometric unit including an optometric optical system is provided with a driving unit that drives the optometric unit, and the driving unit includes the imaging television system An ophthalmologic apparatus having a control means for controlling based on the signal of. 2. The face fixing means is provided with a moving means for moving a chin rest, and the control means controls the moving means together with the driving means on the basis of a signal from the imaging television system. The ophthalmic device according to.