JPH03165735A - Optometrical device - Google Patents

Abstract

PURPOSE:To efficiently perform optometry without requiring the support of a checker and simplify a device itself by allowing a person under check to observe the anterior section image of an eye under check and sights via a fixation target optical system. CONSTITUTION:An optometrical device is constituted of a measurement optical system 2, an anterior section observation optical system 3, and a fixation target optical system 4 for fixing an eyeball. An anterior section image is formed on a light receiving element 7, and the signal from the light receiving element 7 is converted into a video signal to observe an anterior section. A video signal from the light receiving element 7 is inputted to a display unit 11 to display the anterior section image on the display unit 11, and a person under check observes the anterior section image. A sight line 13 and a sight spot ring 14 are concurrently displayed on the display unit 7, and the person under check can judge at what position an eye under check 1 is located with respect to the measurement optical system 2 and can match the cornea center of the checked eye 1 with the optical axis while observing the video on the display unit 11. Optometry can be performed without requiring the support of a checker if the checked person operates a measurement start button or the like when the matching of the cornea center and the optical axis is confirmed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an ophthalmological apparatus, particularly an alignment between an eye to be examined and an ophthalmological apparatus! The present invention relates to an ophthalmological device that allows the following to be performed easily.

[Prior Art] In an ophthalmological apparatus such as an eye refractive power measurement apparatus, it is necessary to match the cornea center or optical axis of the eye to be examined, or the direction of the line of sight with the optical axis of the optical system of the ophthalmic apparatus.

Conventionally, alignment of the optical axis of the eye to be examined and the optical axis of the ophthalmological device was performed by the examiner giving instructions to the examiner or moving the device while viewing the anterior segment image of the examinee on a monitor. The center of the cornea in the anterior segment of the eye was adjusted to match the optical axis (center) of the optical system of the device. [Problems to be Solved by the Invention] However, in the conventional alignment method described above, an examiner is always required to perform an eye examination, and a monitor for alignment is required as an apparatus.

Furthermore, since the examinee cannot confirm the positional relationship between the examinee's eye and the apparatus by himself/herself, the examiner's intention may not be fully understood when following the examiner's instructions.

In view of these circumstances, the present invention has been developed to enable a subject to perform an eye examination independently without requiring assistance from an examiner, and to improve the efficiency of the eye examination while also making it possible to omit a monitor. It also attempts to simplify.

[Means for Solving the Problems] The present invention provides an anterior eye segment observation optical system for forming an anterior eye segment image of a subject's eye, and a system for aiming the anterior eye segment image obtained by the anterior eye segment observation optical system. The present invention is characterized in that it is equipped with a simultaneous viewing target optical system that can be viewed at a glance.

[Operation: The test subject uses the fixation target optical system to locate his or her own IJJ.
The patient can watch the I-eye correction image and the sight, and can align the ophthalmological apparatus and the eye to be examined by himself/herself.

[Example] An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 1, 1 is the eye to be examined, 2 is a measurement optical system for measuring the eye refractive index, 3 is an anterior segment observation optical system, and 4 is a fixation target optical system for fixating the eyeball. .

The anterior eye segment observation optical system 3 includes an objective lens 5, a first relay lens 6, and a light receiving element 7 such as a CCD, which are arranged along the same optical axis, and forms an anterior eye v5 image on the light receiving element 7. It looks like it will.

The fixation target optical system 4 also includes a half mirror 8 disposed between the objective lens 5 and the first relay lens 6 on the optical axis of the anterior segment observation optical system 3, a mirror 9 for changing the optical path, It consists of a second relay lens 10 and a display 11, and the image signal from the light receiving element 7 is input to the display 11. It is now possible to gaze at the image.

Further, a Hartz mirror 12 is disposed at a predetermined position on the optical axis of the anterior segment observation optical system 3, and the half mirror 12 allows the measurement optical system 2 and the eye 1 to be placed on the same optical axis.

The action will be explained below.

An image of the anterior segment of the eye is formed on the light receiving element 7, and by converting the signal from the light receiving element 7 into a video signal, the anterior segment of the eye can be observed. Also, by inputting the video signal from the light receiving element 7 to the display 11, the anterior segment image is displayed on the display 11.
111i! is displayed in front of him/her on the display 11. It is possible to gaze at the partial image. Also, display 7
As shown in Fig. 2, a sighting line 13 and a sighting spot ring 14 are displayed at the same time, and the patient can see how the eye 1 to be examined looks in relation to the optical system (measuring optical system 2). You can determine if the location is correct.

Therefore, while viewing the image on the display 11, the examinee
The center of the cornea can be aligned with the optical axis (the aiming spot ring 14).

Therefore, when the subject confirms that the center of the cornea and the optical axis are aligned, they can operate the measurement start button on the device and perform the required eye examination without requiring assistance from the examiner. .

In the above-mentioned embodiment, the subject gazed at the image of the anterior segment that had been electrically processed, but as shown in FIG. You may also do this.

In FIG. 3, the same parts as shown in FIG. 1 are given the same reference numerals.

A Hough mirror 1 is provided between the first relay lens 6 and the light receiving element 7.
5 is provided, and a mirror 16 is provided on the side opposite to the mirror 9 of the second relay lens 10 to align the optical axis of the light beam reflected by the half mirror 15 with the optical axis of the fixation target optical system 4.

Thus, the fixation target optical system 4 allows the anterior segment observation optical system 3 to
It becomes possible to gaze at the anterior segment image obtained by In addition, at the imaging position of the anterior segment image, there is an aiming slot 7 ring 1 as shown in Fig. 4.
A transparent plate 17 engraved with a number 4 etc. is arranged so that the relative relationship between the eye 1 to be examined and the optical system can be seen.

In this embodiment, as in the above-described embodiments, alignment between the eye to be examined and the apparatus can be performed without assistance from the examiner.

In this embodiment, the light receiving element 7 can be omitted if observation of the anterior segment of the eye is not particularly required.

Furthermore, the invention is not limited to the above-mentioned embodiments; for example, the half mirror 8 may be provided between the objective lens 5 and the eye 1 to be examined, or the half mirror 8 may be provided separately from the main body. good.

Further, although the image displayed on the display 11 is based on the image signal from the light receiving element 7, a television camera may be separately provided and an image captured from the subject's frontal force may be displayed.

Furthermore, the image to be displayed may be not only the portion of the subject ff11 but also the entire image of the subject.

[Effects of the Invention] As described above, according to the present invention, the subject can align the subject's eye with respect to the ophthalmological apparatus by himself/herself, so there is no need for an examiner to perform the measurement, and the ophthalmological work can be simplified. can be greatly simplified.

Furthermore, since a monitor is not required, the ophthalmological apparatus has the excellent effect of simplifying the structure.

[Brief explanation of the drawing]

FIG. 1 is a basic configuration diagram showing one embodiment of the present invention, FIG. 2 is a view taken along the line A-A in FIG. 1, FIG. 3 is a basic configuration diagram showing another embodiment, and FIG. 3 is a view taken along the BB arrow in FIG. 3. FIG. 1 is the eye to be examined, 3 is the anterior segment I! l! 11 is a display, 13 is a line of sight, 14 is a sight spot ring, and 17 is a transparent plate.

Claims (1)

[Claims] 1) Equipped with an anterior segment observation optical system that forms an anterior segment image of the subject's eye, and a fixation target optical system that allows the anterior segment image obtained by the anterior segment observation optical system to be viewed with a sight. An ophthalmological device characterized by: