JPH1052404A - Eye examination device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To take a front eye image and a cornea reflection image of an eye to be examined with respectively required focal depths. SOLUTION: Air inside an air compressing room 1 is compressed by a piston 3 driven by a solenoid 2, and jetted out from a nozzle 4 to the cornea Ec of an eye E to be examined. A luminous flux from a light source 14 is projected on the cornea Ec through a lens 13 and an optical dividing member 8, and the reflected light is received at a photoelectric device 16 through light transmitting members 5 and 6, an optical dividing member 10, and a lens 15. When the cornea Ec is deformed to a prescribed shape by air flow, the volume of the reflected light is maximum, and at the time, the intraocular pressure can be obtained from the pressure inside the air compressing room 1. An image of the front of the eye E to be examined is formed on an imaging member 12 by an optical system consisting of a lens 7, lens 11, etc., so the image can be observed by a TV monitor 18. The light source 14 is also used as a light source for deciding an operation length, and a luminous flux from the light source 14 is projected on the cornea Ec through the nozzle 4 to decide the operation length. The reflected light from the cornea Ec passes through the optical translucent member 5 around the nozzle 4, and the image 14a of the reflected light from the cornea is formed on the imaging member 12 and shown on the TV monitor 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optometry apparatus capable of simultaneously observing an anterior eye image of a subject's eye and a corneal reflection image.

[0002]

2. Description of the Related Art Conventionally, there is no known optometry apparatus capable of capturing both an anterior eye image of a subject's eye and a corneal reflection image at an appropriate depth of focus.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an optometry apparatus capable of capturing both an anterior ocular segment image of a subject's eye and a corneal reflection image at desired depths of focus.

[0004]

An optometric apparatus according to the present invention for achieving the above object provides a corneal reflection image of an eye to be examined and an anterior ocular segment image of the eye to be examined with different luminous fluxes at the time of positioning of the eye to be examined. Illuminating means for illuminating the subject's eye to form, imaging means for capturing the corneal reflection image and the anterior ocular segment image of the subject's eye, and display means for displaying an image captured by the imaging means, An optical member is disposed in the optical system of the image pickup means for selectively transmitting a reflected light beam from the eye to be inspected illuminated by the illuminating means at an optical axis center portion and an optical axis peripheral portion.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 shows an embodiment of an optometry apparatus according to the present invention, in which air in an air compression chamber 1 is compressed by a piston 3 driven by a solenoid 2 and blown from a nozzle 4 onto a cornea Ec of the eye E to be examined. ing. The air compression chamber 1 includes light transmitting members 5 and 6 such as a flat glass and a lens.
A light transmitting portion comprising a light transmitting member 5
It is attached to the central part of. Behind the light transmitting member 6, a lens 7, a light dividing member 8, an anterior ocular segment imaging aperture 9 having wavelength selectivity, a light dividing member 10, a lens 11, and an imaging member 12 such as an imaging tube are sequentially arranged. ing. A measurement lens 13 and a light source 14 are provided on the reflection side of the light splitting member 8, and a lens 15 and a photoelectric element 16 are arranged on the reflection side of the light splitting member 10. Further, the light transmitting member 5
A light source 17 having a wavelength different from that of the light source 14 is arranged around the light source 14, and an output of the imaging member 12 is connected to a television monitor 18.

The light beam emitted from the light source 14 is
The light is projected onto the cornea Ec via the light dividing member 8, and the reflected light is received by the photoelectric element 16 via the light transmitting members 5 and 6, the light dividing member 10, and the lens 15. When the cornea Ec undergoes a predetermined deformation due to the airflow, the reflected light becomes maximum, and the intraocular pressure is obtained from the pressure in the air compression chamber 1 at this time. The anterior segment of the eye E is formed on the imaging member 12 by the optical system including the lens 7 and the lens 11, so that the image can be observed on the television monitor 18.

The light source 14 is also used as a light source for determining a working distance.
Is projected onto the cornea Ec through the nozzle 4. cornea
The reflected light from Ec passes through the light transmitting member 5 around the nozzle 4 to form a corneal reflection image 14a on the imaging member 12, and when the corneal reflection image 14a is in focus when viewed on the television monitor 18, the working distance is determined. Is the best thing. Since the imaging light beam is large and the depth of focus is shallow, the working distance can be accurately adjusted.

In the embodiment, the wavelength of the light source 17 near the light transmitting members 5 and 6 is different from that of the light source 14. As illustrated in FIG. 2, the anterior ocular segment imaging aperture 9 is configured such that the central portion 9a also transmits the wavelength of the light source 17, but the peripheral portion 9b does not transmit this wavelength. The aperture 9 increases the depth, so that the eyelashes and the like of the eye E can be seen better. That is, the corneal reflection image 14a is
Is formed in the vicinity of the iris, but since the eyelashes are further in front, the deeper the eyelashes, the easier it is to see.

It is preferable that both the light sources 14 and 17 use near-infrared light sources, and a near-infrared imaging tube is used as the imaging member 12. Since the iris reflects near infrared light considerably,
When near-infrared light is used, the iris looks white, and the eyelashes can be seen better against the background.

When the observation position is adjusted as described above,
If the eyelashes are likely to be affected by the eyelashes on the air blowing area, take appropriate measures, such as instructing the eyelids to be raised further, to obtain accurate measurements in the most appropriate condition. Will be possible.

[0011]

As described above, according to the optometry apparatus of the present invention, the corneal reflection image and the image of the anterior segment of the subject's eye are formed with light beams having different wavelengths, and the center of the optical axis and the periphery of the optical axis are formed. By arranging an optical member that selectively transmits wavelengths in the optical system of the imaging unit in the optical system of the imaging unit, it is possible to capture both an anterior ocular segment image of the subject's eye and a corneal reflection image at a desired depth of focus.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment.

FIG. 2 is a front view of an anterior ocular segment imaging aperture;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 air compression chamber 4 nozzle 5, 6 light transmitting member 8, 10 is light dividing member 9 anterior ocular segment imaging aperture 12 imaging member 14, 17 light source 16 photoelectric element 18 television monitor

Claims (1)

[Claims] An illuminating means for illuminating the eye to be examined so that a corneal reflection image of the eye to be examined and an anterior ocular segment image of the eye to be examined are formed with light beams having different wavelengths at the time of positioning the eye to be examined; Imaging means for capturing an image of the anterior segment of the subject's eye;
Display means for displaying an image picked up by the image pickup means, and a light beam reflected by the subject's eye illuminated by the illuminating means in the optical system of the image pickup means having a wavelength at an optical axis center portion and an optical axis peripheral portion. An optometry apparatus comprising an optical member that selectively transmits light.