JPH0947430A - Optometry device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain an effect on an examination due to the dark adaptation of a non-examined eye as much as possible by providing a rotary disc with an optical element having the capability of transmitting at least a part of a visible ray, but refusing the easy visibility of a target, and positioning the optical element in an examination window at the side of the non-examined eye at the time of examining one eye. SOLUTION: A plurality of lens discs 13a to 13c are arranged so as to be rotatable around a shaft 17 as a rotational center. in addition, many optical elements such as a weak spherical lens, a strong spherical lens, an astigmatic lens, and a cross-cylinder lens are arranged on the lens discs 13b and 13c, while various auxiliary lens groups including an opening are provided on the auxiliary lens disc 13a along the circumference thereof. in this case, one of the auxiliary lens groups includes a shading optical element 16 for shading a non-examined eye. This shading optical element 16 allows the transmission of light, but is formed to be opaque for refusing the easy visibility of an examination target, and ground glass, for example, may be used for the element 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optometry apparatus for subjectively examining the refractive power of an eye to be examined.

[0002]

2. Description of the Related Art A plurality of rotary discs having various optical elements are provided in a pair of left and right lens units, and by rotating the rotary discs, optical elements having desired optical characteristics are switched to an inspection window. 2. Description of the Related Art An optometry device that subjectively tests the refractive power of an eye to be examined is known.

In the correction refracting power test using this type of optometry device, the left and right eyes are individually tested. An eye to be inspected (hereinafter, referred to as a measurement eye) is caused to observe an inspection target through an optical element arranged in the inspection window. For the eye not to be inspected (hereinafter referred to as the non-measurement eye), a shield plate provided on one of the rotating discs is arranged in the inspection window so that the inspection target cannot be seen.

[0004]

However, the non-measuring eye is in a dark state because the shielding plate in the conventional apparatus uses a light-shielding plate, and the examiner is not accustomed to the optometry or the subject who is difficult to measure. If so, the measurement time of one eye becomes long, and the dark adaptation of the non-measured eye that is shielded progresses. In other words, the eye gets used to the darkness, so after the examination of one eye,
When trying to examine the other eye, it takes time for the eye to become accustomed to the brightness (light adaptation). Therefore,
During this time, there were problems such as glare and difficulty in obtaining sufficient visual acuity.

After the left and right examinations are completed, usually, an examination is conducted to compare the visual appearances of both eyes. At this time, if the dark adaptation of one eye is advanced, the dark adaptation is advanced. The target seen with the eyes may appear brighter. That is, due to the progress of dark adaptation of one eye, the appearances of both eyes are different, which causes a problem of prolonging the examination time and anxiety about the measurement accuracy.

The present invention has been devised in view of the problems of the above-described conventional apparatus, and it is a technical object to provide an optometry apparatus capable of suppressing the influence of the dark adaptation of the non-measurement eye on the examination as much as possible. And

[0007]

In order to solve the above problems, the present invention is characterized by having the following configuration.

(1) In the pair of left and right lens units,
An optometry in which each has a plurality of rotating disks on which a large number of optical elements are arranged, and by rotating the rotating disks, an optical element having desired optical characteristics is switched to an inspection window and arranged to subjectively inspect the refractive power of the eye to be inspected. In the device, an optical element that transmits at least a part of visible light to the rotating disk but is difficult to visually recognize a visual target is arranged in the inspection window on the non-measuring eye side during a single eye inspection. To do.

(2) The optical element of (1) is characterized by being any one of ground glass, frosted glass, opalescent glass, arabasta glass, and color filter.

(3) In the pair of left and right lens units,
An optometry in which each has a plurality of rotating disks on which a large number of optical elements are arranged, and by rotating the rotating disks, an optical element having desired optical characteristics is switched to an inspection window and arranged to subjectively inspect the refractive power of the eye to be inspected. In the device, driving means for driving the rotating disk, input means for inputting measurement data by an objective eye refractive power measuring device or lens meter, and making it difficult for the non-measuring eye to visually recognize the examination target. In order to achieve this, there is provided a determining means for determining the frequency to be loaded based on the measurement data, and a controlling means for controlling the driving means based on the result of the determining means.

[0011]

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of the optometry apparatus according to the first embodiment.
Reference numeral 1 denotes an optometry apparatus main body which subjectively performs a refractive power test of a measurement eye. The optometry apparatus body 1 includes a pair of left and right lens units 1
2 (internal structure will be described later), and various optical elements are electrically switched and arranged in the left and right optometry windows 11. Reference numeral 2 is an optotype presenting apparatus for presenting an optotype for examination. Reference numeral 3 denotes a controller for operating the optometry apparatus main body 1 and the optotype presenting apparatus 2, and the controller 3 has a lens switch for switching the optical system of the optometry apparatus main body 1, a numerical value input switch, a left and right eye designation switch. , A target selection switch, various mode switches, various switch groups such as a program execution and feed switch when performing a program optometry. The switch signal from the controller 3 is input to the control device 4, and the control device 4 issues necessary signals to the optometry apparatus main body 1 and the optotype presenting apparatus 2 to control the operation thereof.

FIG. 2 is a sectional view of an essential part for explaining the internal structure of the lens unit 12 for measuring the left eye (the lens unit 12 for measuring the right eye is bilaterally symmetrical to that for the left eye. Is omitted).

Reference numerals 13a to 13c denote a plurality of lens discs which are rotatable about a shaft 17 as a center of rotation.
A large number of optical elements such as a weak spherical lens, a strong spherical lens, an astigmatic lens, and a cross cylinder lens are arranged in 3b and 13c, and various auxiliary lens groups including apertures are formed on the same circumference in the auxiliary lens disk 13a. It is provided. One of the auxiliary lens groups includes a shielding optical element 16 that shields the non-measurement eye. This shielding optical element transmits light but is opaque and makes it difficult to visually recognize the inspection target. For example, ground glass can be used. Since the ground glass diffusely reflects light on the ground surface, it becomes difficult for the non-measuring eye to visually recognize the target. However, since the amount of transmitted light is secured to some extent, the non-measurement eye can sense the light. Frost glass, opalescent glass, arabasta glass, color filter and the like can be mentioned as those having the same function as the ground glass.

Gears are formed on the outer circumference of each lens disk 13, and each gear is provided with a motor 15 via a gear. By controlling the rotation of the motor 15, the desired lens disk 13 is placed in the inspection window 11. The eye to be inspected 10 sees an inspection target (not shown) in the visual field through an optical system arranged in the inspection window 11.

The operation of the apparatus having the above configuration will be described. In the subjective examination of refractive power, first, the left and right eyes are individually examined. The examiner pushes the left and right eye designation switches (not shown) of the controller 3 to designate the measurement eye. The controller 4 receives the switch signal from the controller 3
Motors 15 for the left and right auxiliary lens disks 13a
Is driven, and an opening is arranged in the inspection window 11 on the measurement eye side,
A shielding optical element 16 is arranged in the inspection window 11 on the non-measurement eye side. Since the shielding optical element 16 is placed in front of the non-measurement eye, the non-measurement eye cannot observe the test target,
You can feel the light.

Subsequently, the examiner operates various switches of the controller 3 to proceed with the examination of one eye. The control device 4 drives the optotype presenting device 2 in accordance with the input signal relating to the optotype to present the required examination optotype, and drives each motor 15 on the measurement eye side in accordance with the input signal relating to the refractive power, The necessary optical system is arranged in the inspection window 11. Based on the response of the examinee, the examiner switches the optical system arrangement on the measurement eye side and performs the prescribed inspection items (astigmatism axis detection test, astigmatism diopter detection test, red / green test for overcorrection prevention, etc.). To obtain the corrective refractive power of one eye.

When the corrective refractive power of one eye is obtained, the measurement eye is switched by the right and left eye designating switch. The control device 4 drives the motor 15 corresponding to the auxiliary lens disk 13a, removes the shielding optical element 16 from the inspection window 11 of the measuring eye, and shields the optical element 16 on the already-inspected eye inspection window 11.
Place. The dark adaptation of the measurement eye that has been blocked up to immediately before has not progressed, so there is little effect on the examination, such as glare and inability to obtain sufficient visual acuity.

As described above, the apparatus according to the first embodiment adopts the light-transmissive and opaque optical element as the shielding material for the non-measurement eye, so that the dark adaptation of the non-measurement eye does not have to proceed.
Therefore, the inspection is not affected immediately after the shielding is released, and highly reliable measurement results can be obtained.

[0019]

Second Embodiment In the first embodiment, a light-transmissive and opaque optical element is used as a non-measuring eye shield. In contrast, in the second embodiment, a measurement data of an objective refracting power measuring device or the like is used. The appropriate spherical power is given in front of the non-measured eye based on
The amount of light applied to the non-measuring eye is secured while making it difficult to see the inspection target.

FIG. 3 is a view showing the schematic arrangement of the eye examination apparatus according to the second embodiment. The same parts as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. Reference numeral 20 denotes an objective refracting power measuring device which projects a measurement optotype onto the fundus of the eye to be examined and detects a projected optotype image of the fundus by a light receiving means to measure the eye refracting power. Reference numeral 21 is a memory for storing measurement data from the objective eye refractive power measuring device 20 and the like, and 22 is a memory 22 for storing an optometry program, which is connected to the control device 4. Although the optometry apparatus main body 1 is provided with a plurality of lens disks having a large number of optical elements inside the lens unit 12 as in the first embodiment, the shielding optical element used in the first embodiment may not be provided.

Next, the operation of the apparatus of the second embodiment will be described.
The procedure for advancing the refractive power test varies depending on the examiner's policy, but here the objective value measurement data from the objective eye refractive power measuring device 20 is used to initialize the optical system of the optometric device body 1. The case of setting will be described.

First, the examiner uses the objective eye refractive power measuring device 20.
Perform an objective test using. Objective eye refractive power measuring device 20
The spherical power, the astigmatic power, and the objective value data of the astigmatic axis of each eye obtained by
It is transferred to the control device 4 by depressing the print switch possessed by and is stored in the objective value memory area of the memory 21. When the objective value switch arranged on the controller 3 is pushed and then the left and right designation switches are pushed to designate the eye to be measured, the control device 4 calls the objective value data stored in the memory 21 and designates it. A correction optical system corresponding to the objective value data of the designated eye is initially arranged in the examination window on the side of the measurement eye. An optical system that makes it difficult to visually recognize the target based on the other objective value data is arranged in the inspection window on the non-measurement eye side.

The determination of the optical system arranged in the inspection window on the non-measurement eye side will be described. If an appropriate cloud (plus spherical power) is applied to the optical system on the non-measurement eye side, it becomes difficult to visually recognize the test target due to blurring, and it becomes possible to measure one eye in the same manner as in the shielded state. The amount of fog to be applied is not a strong amount of fog so as not to make the subject feel uncomfortable, but an amount of fog with which the corrected visual acuity of the non-measuring eye is about 0.1 or less is sufficient. According to the statistics, the myopic dioptric power (here, the spherical dioptric power) of the eye with naked eyesight of 0.1 or less is -3.00D.
(Diopter) It's known to be more. Therefore, in the embodiment, the amount of fog to be applied is determined based on the objective value data on the non-measured eye side with reference to -3.00D.
For example, when the spherical power of the objective measurement value data is -2.00D, the control device 4 has a spherical surface of + 1.00D in the examination window on the non-measurement eye side in order to obtain myopia of -3.00D. An optical system having a refractive power is arranged. The spherical power of objective value data is +
If it is 2.00D, the refracting power of the optical system to be arranged is + 5.00D. The naked eye acuity of the non-measurement eye is 0.
When the myopia is less than 1 (the spherical power of the objective value data is -3.25D or more), it is difficult to discriminate the target even with the naked eye. Has no optical system with refractive power.

As described above, the apparatus arranges the optical system of the fog amount determined on the basis of the objective value data in the examination window of the non-measurement eye. This makes it difficult for the non-measurement eye to visually recognize the test target due to blurring, but the amount of light reaching the eye is secured. Therefore, in a single-eye examination in which a plurality of examinations are performed, dark adaptation of the non-measurement eye does not proceed so much even if the entire examination time is lengthened, so that adverse effects on the examination result due to switching of the measurement eyes can be avoided.

In the above embodiment, even if there is astigmatism in the non-measured eye, the astigmatic power is not particularly taken into consideration. Alternatively, the minimum circle of confusion may be set to −3.00D without correcting astigmatism, or may be ignored when the dioptric power is low.

Further, -3.00D is one preferable example, and the present invention is not limited thereto. The amount of fog applied to the non-measuring eye can be determined by using not only the measurement data of the objective eye refractive power measuring device 20 but also the refractive power data of the eyeglasses by the lens meter.

The present invention has been described above based on the embodiments, but the present invention is not limited to the embodiments, and various modifications can be made. These are also within the scope of the same technical idea as the present invention. It is included.

[0028]

As described above, according to the present invention,
It is possible to avoid adverse effects on the examination due to dark adaptation of the non-measurement eye.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an optometry apparatus that is a first embodiment.

FIG. 2 is a cross-sectional view of the subjective-type refractive power measuring device that is Embodiment 1.

FIG. 3 is a configuration diagram of an optometry apparatus that is Embodiment 2.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Subjective refractive power measuring device 3 Controller 4 Control device 11 Optometry window 12 Lens unit 13 Lens disk 15 Motor 16 Shielding optical element 20 Objective refractive power measuring device

Claims (3)

[Claims] 1. A pair of left and right lens units each have a plurality of rotating disks on which a large number of optical elements are arranged, and by rotating the rotating disks, optical elements having desired optical characteristics are switched and arranged on an inspection window. In an optometry device that subjectively inspects the refractive power of the eye to be inspected, an optical element that transmits a part of at least visible light but has difficulty in visual confirmation of the visual target is arranged in the rotating disc, and is not used during a single eye examination. An optometry device arranged on an examination window on the side of the measurement eye. 2. The optical element according to claim 1 is ground glass,
An optometry device, which is one of frosted glass, opalescent glass, arabasta glass, and color filter. 3. A pair of left and right lens units each have a plurality of rotating discs on which a large number of optical elements are arranged, and by rotating the rotating discs, optical elements having desired optical characteristics are switched and arranged on an inspection window. In an optometry device that subjectively examines the refractive power of the eye to be inspected, a driving unit that drives the rotating disk, and an input unit that inputs measurement data by an objective eye refractive power measurement device or a lens meter, Determining means for determining the frequency to be loaded based on the measurement data in order to make it difficult to visually recognize the inspection target by the non-measurement eye,
An optometry apparatus comprising: a control unit that controls the drive unit based on a result of the determination unit.