JPS5980227A - Apparatus for measuring refractive force of eye - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an apparatus 1-1 for objectively and automatically determining the refractive power of the eye, by arranging a plurality of cylindrical lenses in the visual target optical system. This article relates to 41i'l, which allows for self-conscious measurement.

As a device to adjust the refractive power of the eye to adjust eyeglasses, it has become popular in recent years due to its fast set time, the fact that it does not require skill, and therefore there is little difference in measurement between examiners. Objective automatic refractive power measuring device r&
have been proposed, but in these devices usually 11
After the 1A sense measurement, final adjustments are made using a subjective ophthalmoscope. Therefore, the examiner has to install two devices, an objective type and a subjective type, which has the drawback of requiring more cost and energy.

In order to eliminate the above-mentioned drawbacks, the present invention enables measurement of both objective and subjective sensations with one device.

That is, in a device that objectively and subjectively measures the refractive power of the eye, a plurality of cylindrical lenses are arranged in the optotype optical system so as to be rotatable, co-rotational, and movable, and a spherical lens in the optotype optical system is arranged so as to rotate or move. Alternatively, the visual target can be moved so that the data during objective measurement can be automatically input during subjective measurement, and the spherical refractive power, cylindrical refractive power, and axial angle of the subject's eye can be measured subjectively by manual operation. This invention relates to a device for determining eye refractive power.

The details of this invention will be explained below with reference to the drawings.

Fig. 1d is a diagram of the eye refractive power measuring device according to the present invention ()Y: system arrangement 1'1, where (]) indicates measurement [1[light source, (2) and (3) are condensing lenses, (4) if: fundus of the eye to be examined (8) and Jj9 position 1i
The spot diaphragm can be moved as much as possible, (
5), (6) are objective lenses, (7), (9) are prisms, (10 is a mirror, (Ill, Q2 is a relay lens, O
Jd boyfriend test 1lIL! Is it 1i conjugate to the fQ film in (8)? ,
? A band-shaped corneal reflection removal mask is placed at
θG is an imaging lens. Reference numeral 019 indicates a light receiving element for measurement, which rotates around the entire center of the light 1IIIll in synchronization with the measurement light source (1) and the corneal irregularity removal mask OJ. 0'7) is a first relay lens movable on the optical axis, and its movement is proportional to the spherical refractive power of the eye to be examined. (181, QI are positive cylindrical lenses with the same focal length, and both have the ability to independently rotate the optical axis all the way up and down. <2fl is the second relay lens, 2+1 is the second relay lens An optotype is placed at the focal position of 0◆, @ is a condenser lens, and βt is an illumination lamp.

Figures 2 and 3 show other embodiments of the target optical system, and (18A) and (19Fk) in Figure Ω are cylindrical lenses with the same iF of focal length [1llF; V is independent -()Y; It is rotatable around 1llII+. In FIG. 3, (18b) is a positive cylindrical lens, which is movable along the optical axis +4. (1
9b) shows a negative cylindrical lens, and a positive cylindrical lens (xs
h) and - rotate around the optical axis.

Kiranikore F) Both cylindrical lenses and the first! The Jt/- lenses can all move along the optical axis.

The second figure is a block diagram showing the path for operating the first relay lens α, the cylindrical lens (18), and Ql in the optotype optical system, and (to) is provided on the side of the body (not shown).
11. -(: The dial generates a puffless signal by rotating the rotary encoder.
1 is a parnu counter, 2 is a microcomputer that controls all operations related to objective and subjective measurements, 2 is a display, (c) is a pulse motor drive, ■ is a cylindrical lens αl'o, (li is an optical axis) 1)/A converter, C311, 1 first relay lens Move Q71 along the optical axis] a c to change the 161 flexural force
The motor, c32, is a /D converter, 1, IJ, , 11 ~ 戊, such as l-, and is an optical MX
The light energy emitted from (i) passes through the condensing lenses (2) and (3), the tube lens (4), and the objective lens (5), and is concentrated on the - of the eye (8) σ) H+11. light 111
Reach bottom 4. On the other hand, the light from the lighting lamp &:I:
The condenser lens 11!7D is projected onto the fundus of the eye (8) to be examined (8), and the eye to be examined (8) is made to fixate. The light reflected directly from the eye is reflected by mirror H,
Relay lens 011. After passing through Q9, the image is formed on the light receiving element (1 (9) by the 1-quadrant lens. Light receiving element 019
The optical energy incident on the microcomputer aj is supplied as a digital V signal to the microcomputer aj. After completing the alignment for the eye to be examined (8) 411) Set button (not shown) ♀
When pressed, the microcomputer α- sets the spot diaphragm (4
) is at the same position as the fundus of the eye to be examined (8) and J1G ii′i
Spot aperture (4) and move 1llll lens until it reaches 14.・Transfer 11iIl. At the same time, the optotype eJl
+ is imaged on the bottom of the eye to be examined (8), and then the first relay lens αη is moved so that fog is applied by an appropriate diopter. After that, the measurement light source (1),
Corneal reflection removal mask (1:1 and measurement light receiving element 09
Rotate 7g00 in the same direction as the optical axis. During rotation, the spot diaphragm (4) and the movable lens 04) move in response to signals from the light-receiving element, and the refractive power value of 7.1 for each meridian can be determined by the movement of the spot diaphragm (4) and the movable lens 04).

After the objective measurement of 1 zo above is completed, consciousness n111
When the constant switching switch (not shown) is pressed, the first V-lens α moves to the position of the value obtained by objective measurement under the control of the microcomputer (A), and the cylindrical lens O
Hinoki and +Ifl rotate respectively.

Therefore, the subject 111J (8) views the optotype 211 with the refractive power obtained through objective measurement corrected.
In this state, if the subject cannot visually recognize the land/L/ ) ring corresponding to visual acuity of 1.0 in the optotype, subjective measurement is performed by the following manual operation. Measurements are made for each of the spherical refractive power, cylindrical refractive power, and axial angle. When performing 4111 constant of spherical refractive power, F:, l: 1-ii
! +lj 41〒force 4 yen constant) 11 switch -1-k 4
If you can turn the diamond / I / 1 example, the counter (5)
By Parnu Shin υ Suga Micro = 1 Nbuta O and Human Power ΔJt, Change to 19! Kyo C-fuchin 5/intermediate (I) 0 moke (31) is activated and the first relay lens is moved to the golden optical axis. When measuring the cylindrical refractive power, perform the cylindrical refractive power measurement step (4-f, IQb (6 degrees) 1llll constant).
Place n l#711. l1ill ff 1st degree training [
Press the 11 switch to dial diamond/l/G'/11 rl
-Pulse mode from rotating machine and computer ζ// D'tl
Ill'l! I and rotate the cylindrical lenses 0 and d independently. Diamond /l/ (2I9
& For example, one pulse is generated by the rotation of 2, and the spherical and cylindrical surfaces In! It is set so that the axis f (1 degree corresponds to 1 degree) and the axis f (1 degree corresponds to 1 degree). The refractive power is displayed in the same manner as in the embodiment shown in Fig. 2. In the embodiment shown in Fig. 3, 1) C-motor (first relay lens 07 by 31j) , cylindrical lens (1811) and (19!
1. ) are integrally moved to set the spherical refractive power of the cylindrical lens (181 and the cylindrical refractive power of the cylindrical lens 1'). In addition, a cylindrical lens (181
ri and (191 ri rotate as one)-rl 1lil
ll Set G11 degrees.

In this embodiment, the first 'J-ray lens is movable, but the other optical elements in the target optical system r.
For example, a similar effect can be obtained by moving the second relay lens, optotype, etc.

As is clear from the above description, the present invention enables i],
Immediately after the objective measurement is completed, the subjective measurement is performed using one unit 1i', /. becomes. Furthermore, conventionally, a 1゛giant i1'' cloud V is generally used, so there is a 1 skin J (H1 eye) that is not sufficiently covered with fog, but according to this invention, ``111i analysis force can be changed by -motion''. Because of this, it becomes possible to apply clouds to 11υ (6 shouts 11↓ for the necessary amount of time).

[Brief explanation of the drawing]

FIG. 1 is an optical system layout diagram of an eye refractometer according to the present invention, FIGS. 2 and 3 are optical system layout diagrams showing other embodiments of the target optical system, and FIG. J is a block diagram. be. (1) ・ -・ 1llll 5. i! , 111
Light source (4) -- Nubot diaphragm (5), (6)...71 Q Button (8) ・
・ ・ - Skin l plan eye (1: @...1 "1 Luso! Reflection removal mask (11)...Movement Φ1 lens (1 (9... Light receiving element U... 1st relay lens ( 18), 4...Cylindrical lens (2+1...Optotype patent applicant Nidetsu Co., Ltd.

Claims (1)

[Claims] In a device for objectively automatically determining the refractive power of the eye, a plurality of cylindrical lenses are rotatably or rotatably and movably arranged in the optotype optical system, and a spherical lens or optic lens is arranged in the optotype optical system. The target eye is made movable, and the fixed time data of the objective eye 41 can be automatically input manually during subjective measurement, and the spherical refractive power, cylindrical refractive power, and axial
Eye Wit rupture power measurement device f that enables subjective measurement of 1 degree
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