JPH0473046A - Eye inspector - Google Patents

Abstract

PURPOSE:To achieve automatic identification of right and left eyes when inspected even in an ophthalmological apparatus of a hand carrying type or without sliding base by measuring a level, intense or weak, of a reflected light of a luminous flux emitted from a light source which lights a side part of a signal eye to identify the right and left eyes. CONSTITUTION:When an eye inspecting axis X aligns a left eye EL, lighting areas a and Db of light sources 2a and 2b are given on the right and left. A luminous flux from the light source 2a is intense in reflection as hitting a nose of a person S to be inspected and hence, a relatively large signal is obtained with a photo detector 3a. On the other hand, the luminous flux from the light source 2b becomes weaker as it is off a face of the person S to be inspected and hence, a relatively small signal only is obtained with a photo detector 3b. Thus, by comparing the size of output signals of the photo detectors 3a and 3b, that the left eye EL is inspected can be identified.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an ophthalmometric device, such as a tonometer or an ophthalmological ultrasound device, which identifies left and right eyes during eye examination and inputs the information to the device. It is.

[Prior Art] Conventionally, when an eye is examined using a tonometer, for example, it is necessary to identify whether the eye under examination is the left eye or the right eye, input it into the device, and use it for display, recording, etc. However, a generally known method for identifying left and right eyes is based on the position of the sliding table of the device.

[Problems to be Solved by the Invention] As described above, since the left and right eyes are conventionally identified based on the position of the sliding table, it is difficult to identify the left and right eyes with hand-held ophthalmological equipment or other ophthalmological equipment that does not have a sliding table. The problem is that it is impossible.

An object of the present invention is to enable a hand-held ophthalmological apparatus or an ophthalmic apparatus without a sliding table to automatically identify the left and right eyes during eye examination, input the information into the apparatus, and use it for display, recording, etc. The purpose of the present invention is to provide an optometry device that provides the best results.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the optometry device according to the present invention includes a light source that emits a luminous flux that illuminates the side part of the monocular, and a photoelectric device that receives reflected light of the luminous flux. The present invention is characterized by comprising a sensor and means for identifying left and right eyes based on the amount of light received by the photoelectric sensor.

[Function] The optometry device having the above-mentioned configuration detects whether the left and right eyes are aligned based on the intensity of the reflected light of the light beam emitted from the light source that illuminates the side part of the monocular eye, in a state in which the eye to be examined is aligned and in a predetermined positional relationship. identify.

[Example] The present invention will be explained in detail based on illustrated embodiments.

FIG. 1 shows a first embodiment of the present invention, in which 1 indicates an optometry device;
S indicates the subject, X indicates the optometry axis, and the optometry axis
It matches. As shown in FIG. 2, on the front of the optometry device 1, there are light sources 2 on both the left and right sides with the optometry axis X as the center.
A light detection means consisting of light receiving elements 3a and 3b and light receiving elements 3a and 3b is arranged.

As shown in Fig. 1, when the optometry axis X is aligned with the left 1]ffEL, the illumination areas Da and Db of the light sources 2a and 2b are as shown in Fig. 3, of which the luminous flux from the light source 2a is Since it hits the nose of the subject S, the reflection is strong, and the light receiving element 3a
A relatively large signal can be obtained.

On the other hand, since the light beam from the light source 2b deviates from the face of the subject S, the reflection becomes weak, and only a relatively small signal is obtained at the light receiving element 3b. Therefore, by comparing the magnitudes of the output signals of the light receiving elements 3a and 3b, it can be determined that the left eye EL is being examined.

Conversely, if the optometry axis X matches the right eye ER, light source 2
The optical axis from a is off the face of the subject S, so the reflection is weak (
On the other hand, the light flux from the light source 2b hits the nose and is reflected strongly, so the output signal of the light receiving element 3b becomes large and the output signal of the light receiving element 3a becomes small.By comparing the magnitudes, the right eye ER can be determined. is identified as undergoing optometry. It is preferable to use near-infrared light as the light sources 2a and 2b, because near-infrared light is not dazzling and the difference depending on the degree of reflection of melanin pigment is small.

FIG. 4 shows a second embodiment in which the present invention is applied to an ophthalmological ultrasound device, and 11 is an ultrasound probe that is in contact with the left eye EL, which is the eye to be examined, and the outside of this ultrasound probe is A light detection means consisting of a light source 12, a light receiving element 13, and a lens 14 is provided.

In this embodiment, for example, when testing the left eye EL, the light source 12
illuminates the nose of the subject S, and the direction of the light detection means is set so that the illuminated area is away from the face during the right eye examination. Therefore, it is possible to identify the left and right eyes, such as when the reflected light of a certain amount or more is returned, the left eye is EL, and when the reflected light is below a certain amount, the right eye is ER.

Note that, after AD conversion, the signal from the light-receiving element is input to a computer to make the above-mentioned judgment, and can be used for display, recording, etc. If the lighting of the illumination light source is linked to the optometry switch or the like, information at the time of optometry can be obtained more reliably.

[Effects of the Invention] As explained above, the optometry device according to the present invention can automatically identify the left and right eyes during optometry without relying on a mechanical mechanism such as a sliding table. Even in devices or other ophthalmological devices that do not have a sliding table, it becomes possible to distinguish between the left and right eyes.

[Brief explanation of the drawing]

The drawings show an embodiment of the optometry apparatus according to the present invention, and FIG. 1 is a plan view of the first embodiment, FIG. 2 is a front view, FIG. 3 is an explanatory diagram of the opening area, and FIG. FIG. Reference numeral 1 indicates an optometry device, 2a and 2b are light sources, 3a and 3b are light receiving elements, 11 is an ultrasonic probe, 12 is a light source, and 13 is a light receiving element. Patent applicant Canon Co., Ltd.

Claims (1)

[Claims] 1. A light source that emits a luminous flux that illuminates the side part of the monocular, a photoelectric sensor that receives reflected light of the luminous flux, and a means for identifying left and right eyes based on the amount of light received by the photoelectric sensor. optometry equipment.