JPH07250816A - Ophthalmologic measuring apparatus - Google Patents

Abstract

PURPOSE:To enable alignment while utilizing a cornea reflected image. CONSTITUTION:An image of an anterior ocular part of an eye E to be inspected is formed on an image pickup member 12 by an optical system comprising a lens 7, a lens 11 and the like to allow the observation of the image with a TV monitor 18. When a liminous flux from a light source 14 is projected onto a cornea Ec through a nozzle 4, the reflected light from the cornea Ec passes through a light transmitting member 5 surrounding the nozzle 4 and forms a cornea reflected image 14a on the image pickup member 12. An adjustment is performed by using the cornea reflected image 14a at the center of a pupil viewing a TV monitor 18 to accomplish an alignment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ophthalmologic measuring device used in an ophthalmic hospital or the like.

[0002]

2. Description of the Related Art In an ophthalmologic measuring device, an anterior segment of an eye to be inspected and a corneal reflection image are displayed on a television monitor to perform alignment with the eye to be inspected for alignment while utilizing the corneal reflection image. There is a demand for a more accurate and easy-to-operate person.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an ophthalmologic measuring apparatus capable of performing alignment while utilizing a corneal reflection image more accurately and in a form that is easier to operate.

[0004]

An ophthalmic measuring apparatus according to the present invention for achieving the above object is an apparatus for measuring an eye to be inspected, which comprises an optical system for measuring an eye to be inspected and an optical system for measuring eye to be inspected. Light source means for projecting a light flux from the central part of the system to the cornea of the eye to be inspected, illumination means for illuminating the anterior segment of the eye to be inspected separately from the light source means, corneal reflection image by the light source means, and an object by the illumination means. It is characterized in that it has an observing means capable of observing the anterior ocular segment image on the same image plane through a common optical system.

[0005]

In the ophthalmologic measuring apparatus having the above-mentioned structure, the corneal reflection image by the light flux of the light source means projected from the central portion of the measuring optical system and the anterior ocular segment image by the light flux illuminated by the illuminating means are the same. Make it observable on the image plane.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the illustrated embodiments. FIG. 1 shows an embodiment of an ophthalmologic measuring apparatus according to the present invention, in which the air in an air compression chamber 1 is compressed by a piston 3 driven by a sonolide 2 and the eye 4 to be inspected is ejected from a nozzle 4.
It is designed to be sprayed on the cornea Ec. Air compression chamber 1
Is provided with a light transmitting portion composed of light transmitting members 5 and 6 such as a flat glass and a lens, and the nozzle 4 is attached to the central portion of the light transmitting member 5. Behind the light transmitting member 6, a lens 7, a light splitting member 8, an anterior ocular segment imaging diaphragm 9 having wavelength selectivity, a light splitting member 10, a lens 11, and an image pickup member 12 such as an image pickup 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,
A lens 15 and a photoelectric element 16 are provided on the reflection side of the light splitting member 10.
Are arranged respectively. Further, a light source 17 having a wavelength different from that of the light source 14 is arranged around the light transmitting member 5,
The output of the image pickup member 12 is connected to the television monitor 18.

The light flux emitted from the light source 14 is reflected by the lens 13,
The reflected 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 by the air flow, this reflected light becomes maximum, and the intraocular pressure is obtained from the pressure in the air compression chamber 1 at this time. The anterior ocular segment of the subject's eye E is imaged 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 the working distance, and when determining the working distance, the light source 14 is used.
The light flux from is projected on 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 the corneal reflection image 14a on the image pickup member 12, but the working distance is when the cornea reflection image 14a is in focus when looking at the television monitor 18. Is the best place. Since this imaging light flux 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 periphery of the light transmitting members 5 and 6 is different from that of the light source 14. As shown in FIG. 2, the anterior ocular segment imaging diaphragm 9 is configured such that the central part 9a also transmits the wavelength of the light source 17, but the peripheral part 9b does not transmit this wavelength. The diaphragm 9 increases the depth so that the eyelashes and the like of the eye E can be better seen. That is, the corneal reflection image 14a is the eye E to be examined.
It is formed near the iris, but since the eyelashes are further forward, it is easier to see when the depth is deeper.

It is preferable that both the light sources 14 and 17 use a near infrared light source and a near infrared image pickup tube is used as the image pickup member 12. Since the iris reflects a lot of near infrared light,
This is because the iris appears white when near-infrared light is used, and the eyelashes look even better against the background.

When the observation position is adjusted in this way,
Since the condition of the eyelashes on the air-blowing area can be seen well, if there is a possibility that the eyelashes are likely to affect the eyelashes, take appropriate measures such as instructing the eyelids to be raised further to ensure accurate measurement in the most appropriate state. It will be possible.

[0012]

As described above, the ophthalmologic measuring apparatus according to the present invention enables the examiner to perform accurate alignment in a simpler form than using the corneal reflection image at the center of the pupil.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment.

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air compression chamber 4 Nozzle 5 and 6 Light transmission member 8 and 10 Light splitting member 9 Anterior ocular segment imaging diaphragm 12 Imaging member 14 and 17 Light source 16 Photoelectric element 18 Television monitor

Claims (1)

[Claims] 1. An apparatus for performing measurement on an eye to be inspected, comprising: an optical system for measuring eye to be inspected; and light source means for projecting a light flux from a central portion of the optical system for eye to be inspected onto a cornea of the eye to be inspected.
An illumination unit that illuminates the anterior ocular segment of the subject's eye separately from the light source unit, a corneal reflection image by the light source unit, and an anterior segment of the subject's eye by the illumination unit are formed on the same image plane via a common optical system. An ophthalmologic measuring device, comprising: an observing means capable of observing.