JP2000102509A - Optotype - Google Patents

Abstract

PROBLEM TO BE SOLVED: To examine eyes smoothly by easily obtaining information on the contents or usage of examination optotype. SOLUTION: This optotype for examining the function of a subject's eye has an examination optotype plate 3, box to store the optotype plate 3, and an optotype display changing means. The optotype plate 3 has a first surface with plural optotype display parts in which different optotype is displayed and a second surface with an information visual display part in which information on the optotype is displayed. The box to store the optotype plate has an index window for presenting one of the plural optotype display parts and an information window 7 for confirming index information 15a-15j at least on the presented examination index. The optotype display changing means moves a required optotype display part to the optotype window.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optotype presenting apparatus for presenting an optotype for inspecting visual functions, and more particularly to an optotype presenting apparatus suitable for a near test.

[0002]

2. Description of the Related Art Optotype presenting apparatuses for presenting various test optotypes are used for visual function tests for examining the refractive power and the like of an eye to be examined. This device is classified into a device for long-distance inspection and a device for near-distance inspection.

Many of the near-inspection devices have a simple configuration. For example, a disk-shaped optotype plate having a large number of test targets is rotated in a plate-shaped case provided with a target window. 2. Description of the Related Art There is known a device which is stored in such a manner that an examiner rotates and operates an optotype plate to switch and present an inspection optotype in an optotype window.

[0004]

When performing an examination, an examiner cannot perform an accurate examination unless he or she knows the contents of the examination target and how to use it. However, test targets are often different due to differences in manufacturers and equipment,
It is difficult for the examiner to memorize all of them. It is also possible to take out the instruction manual or the like and carry out the inspection while checking the method of use or the like, but this is troublesome in performing the inspection smoothly. In addition, if the instructions and the like are lost, the examiner who does not fully understand the contents of the target may have a problem in the examination.

[0005] In addition, there is an examination target in which a character of the examination distance is marked toward the end, but this is not necessary for presentation to a subject, and the subject's eye gazes at the character. As a result, the viewpoint may not be determined, and the inspection time may be long.

The present invention has been made in view of the above problems, and provides an optotype presenting apparatus that enables an examiner to easily know information such as a method of using an optotype and to perform an inspection smoothly. Technical issues.

[0007]

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

(1) In an optotype presenting apparatus for presenting an optotype for inspecting the visual function of an eye to be examined, a first surface having a plurality of optotype screen sections provided with different test optotypes and the test An optotype plate including a second surface having an information screen portion on which optotype information relating to the optotype is provided; and a housing for accommodating the optotype plate, wherein one of the plurality of optotype screen portions is provided. A housing provided with a target window for presenting a target and an information window capable of confirming target information on at least the test target presented, and a target for moving an intended target screen part to the target window Screen switching means.

(2) In the optotype presenting apparatus of (1),
A plurality of the information screen units are provided so as to correspond to the plurality of target screen units.

(3) In the optotype presenting apparatus of (2),
The position of the information screen on the second surface is substantially the same as the position of the corresponding optotype screen on the first surface.

(4) In the optotype presenting apparatus according to any one of (2) and (3), the information window is provided so that only the optotype information relating to the test optotype presented from the optotype window can be confirmed. It is provided in a housing.

(5) In the optotype presenting apparatus according to any one of (1) to (3), the size of the optotype window and the size of the information window are substantially the same.

(6) In the optotype presenting apparatus of (1),
The optotype plate has a disk shape rotatably housed in the housing, and the optotype screen switching means is an operation means for rotating the optotype plate.

(7) In the optotype presenting apparatus of (1),
The test optotype is a near test optotype, and the optotype information includes an test distance for the test optotype and / or a visual acuity value at the test distance.

(8) In the optotype presenting apparatus of (1),
The test optotype is a near test optotype, and the optotype information includes the test optotype and / or a method of using the test optotype.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an optotype presenting apparatus 1 used for a near vision test. Reference numeral 2 denotes a plate-shaped housing that houses a disc-shaped optotype plate 3 on which a plurality of test optotypes (the test optotypes will be described later). Reference numeral 4 denotes a target window of an opening for presenting the test target of the target plate 3 to the eye to be inspected. Optotype plate 3
Is held by the housing 2 so as to be rotatable around the pin 5, and the examiner rotates a part of the optotype plate 3 protruding from the housing 2, so that a desired test optotype is provided on the optotype window 4. A switching arrangement can be provided. In this embodiment, the device 1 (casing 2)
The front and rear surfaces have the same shape, and an information window 7 (see FIG. 2) having substantially the same size as the optotype window 4 is provided at substantially the same position as the optotype window 4 on the rear surface of the housing 2. I have. Thereby, the examiner can see the optotype information (the optotype information will be described later) written on the rear surface of the optotype plate 3.

As shown in FIG. 2, the apparatus 1 can be mounted via a near point bar 52 to a subjective refracting power measuring unit 50 in which various optical elements are switched to an inspection window 51. The housing 2 of the device 1 is provided with a hanging unit 6,
This is inserted into the near point bar 52 attached to the measuring unit 50 and suspended. The suspension 6 is movable along the near point bar 52. A scale indicating the inspection distance is provided on the near point bar 52, and the inspection distance of the apparatus 1 can be set by positioning the suspension 6 according to the scale. In FIG. 2, reference numeral 60 denotes an operation unit including various switches for operating the measurement unit 50.

Next, the target plate 3 will be described. FIG. 3 is a detailed view of the front surface of the optotype plate 3, and FIG. 4 is a detailed view of the rear surface of the optotype plate 3.

In FIG. 3, the area inside the dotted line 10 indicates an area corresponding to the optotype window 4 (hereinafter referred to as optotype screen section).
The test target drawn in the target screen is presented to the eye through the target window 4. In the present embodiment, 10
A plurality of optotype screen sections 11a to 11j are provided, and test optotypes 12a to 12j are described respectively.

The test optotype 12a is a group of character optotypes having a visual acuity value of 0.1 to 0.5 at the test distance of 40 cm, and the test optotype 12b is a character optotype group of visual acuity value of 0.6 to 1.0 at the test distance of 40 cm. The test optotypes 12c and 12d are single-row character optotypes used for the vertical oblique test, and at a test distance of 40 cm, the test optotype 12c corresponds to a visual acuity value of 1.0, and the test optotype 12d corresponds to a visual acuity value of 0.6. It is written in the size to be. The test optotypes 12e and 12f are vertical single-row character optotypes used for the horizontal oblique test. At a test distance of 40 cm, the test optotype 12e corresponds to a visual acuity value of 1.0, and the test optotype 12f corresponds to a visual acuity value of 0.6. It is written in the size to be. The test optotypes 12g and 12h are cross grid optotypes used for the presbyopia addition detection test, and the test optotype 12h is obtained by rotating the test optotype 12g by 45 degrees. The test target 12i is a radiographic target, and the numbers drawn around the radiation are written with a size corresponding to a visual acuity value of 0.2 at a test distance of 40 cm. Test target 12
j is a group of numerical targets having a visual acuity value of 0.1 to 1.0 at an inspection distance of 40 cm.

In FIG. 4, the area inside the dotted line 13 indicates an area corresponding to the information window 7 (hereinafter referred to as an information screen section).
The target information drawn in the information screen section can be viewed from the information window 7. In the present embodiment, ten information screen portions 14a to 14j are provided on the rear surface of the optotype plate 3, and optotype information 15a to 15j on the test optotypes 12a to 12j are respectively described. That is, test target 1
On the back side of the optotype screen section 11a on which 2a is described, the information screen section 1 on which optotype information 15a relating to the test optotype 12a is described.
4a, and information screen portions 14b to 14j are provided behind the optotype screen portions 11b to 11j, respectively.

The target information 15a and 15b include the test target 1
The test distances of 2a and 12b are 40 cm, and the distance at which each target row has a visual acuity value of 1.0 is described. The optotype information 15c and 15e indicate that the test optotypes 12c and 12e correspond to a visual acuity value of 1.0 at a test distance of 40 cm.
The test optotypes 12d and 12f have the test distance 40
It is stated that the eyesight value in cm corresponds to 0.6. In the optotype information 15g and 15h, for example, "set a cross cylinder lens and add a plus power until it looks the same in both the vertical and horizontal directions." The usage of the test optotypes 12g and 12h is described, for example, "Add positive frequency". The target information 15i indicates that the figure drawn around the radiation corresponds to a visual acuity value of 0.2 at an inspection distance of 40 cm. The target information 15j includes the test target 12j.
The test distance is 40 cm, and the distance at which each optotype sequence has a visual acuity value of 1.0 is described.

The information screen sections 14c to 14f, 14i
It is more convenient to describe the usage of each test target and a brief summary. For example, in the information screen portion 15i of the test target 12i, a usage such as "add a plus spherical surface to make the number readable. Multiply the number of the line that looks dark by 30 and calculate the astigmatic axis angle" is used. Please note that
Helps the examiner.

An example of a near vision test using the optotype presenting apparatus 1 will be described. First, the device 1 is moved to the near point rod 52.
The test target 12a or 12b for visual acuity test is arranged in the target window 4 and presented to the eye to be inspected. Here, it is assumed that the test target 12a (see FIG. 5A) is presented first. When it is desired to know the test distance at which the test target 12a is set, the test distance can be confirmed by viewing the target information 15a (see FIG. 5B) from the information window 7 on the back side. When testing at a different near-work distance, the distance display of each optotype row is confirmed by the optotype information 15a, and it is checked whether the visual acuity value of 1.0 can be obtained by arranging the apparatus 1 at that distance. be able to.

As described above, since information on the test optotypes provided on the front surface is written on the rear surface of the optotype plate, the examiner does not need to prepare an instruction manual or the like during the test without preparing an instruction manual or the like. You can check the information. Further, since only the test target is presented from the target window, the eye to be inspected does not see unnecessary characters or the like, and accurate inspection can be performed without misleading the viewpoint of the eye to be inspected.

Furthermore, in order to provide a large number (10 in this embodiment) of optotype screen sections (inspection optotypes), the size of the optotype plate (apparatus itself) must be increased. Occurs. The conventional optotype plate is provided with about 5 optotype screen sections (inspection optotypes) on both the front and rear surfaces, and has a circular shape with a diameter of about 15 cm. On the other hand, since the optotype plate of the present embodiment has ten optotype screen sections only on the front surface, the size of the optotype screen section needs to be about twice as large as that of the related art. If this is arranged in front of the eye to be examined, the optotype plate (apparatus) occupies most of the field of view, and unnecessary objects are not shown to the eye during examination.

In this embodiment, the size of one optotype screen section and one information screen section is substantially the same, and the size of the optotype window and the information window are also substantially the same. This is so that it is not necessary to consider the front and back when inserting the optotype plate into the housing. Of course, the size of the optotype screen section and the information screen section (optotype window and information window) may be different.
Each position on the rear surface may be different.

As shown in FIG. 6, it is not necessary to provide the same number of information screen portions as the front optotype screen portion on the rear surface of the optotype plate 3 (here, the information of the entire test optotype is provided. The four information screen parts 22a to 22 in which the optotype information 21 is similarly written
22d). In this case, it is convenient to attach a code or the like to each of the test targets so that they can be easily identified. Further, the distance display of each optotype sequence of the test optotype (for example, the test optotype 12a) may be described in the optotype screen section. The size of the information window may be substantially the same as that of the information screen unit 22a, or may be the size indicated by the dotted line 20. Further, both the target information and the test target may be described on the information screen portion.

In the present embodiment, the number of optotype screen sections (information screen sections) is ten, but the number is not limited to this. Also, various test targets can be freely selected and arranged.

[0030]

As described above, according to the present invention,
The examiner can easily know information such as the contents of each test target and how to use it even during the test. In addition, since an eye other than the test target is not visible from the subject's eye during the test, an accurate test can be smoothly performed.

[Brief description of the drawings]

FIG. 1 is a schematic external view of an optotype presenting apparatus according to an embodiment.

FIG. 2 is a diagram showing a state when the optotype presenting apparatus of the embodiment is used by being attached to a subjective refraction measuring unit.

FIG. 3 is a detailed view of the front surface of the optotype plate.

FIG. 4 is a detailed view of a rear surface of the target plate.

FIG. 5A is a diagram showing details of an optotype screen section and an information screen section.

FIG. 5B is a diagram showing details of an optotype screen section and an information screen section.

FIG. 6 is a diagram showing an example of transformation of the rear surface of the target plate.

[Explanation of symbols]

 2 housing 3 optotype plate 4 optotype window 7 information window 12a to 12j test optotype 15a to 15j optotype information

Claims (8)

[Claims] 1. An optotype presenting apparatus which presents an optotype for inspecting a visual function of an eye to be inspected, comprising: a first surface having a plurality of optotype screen sections provided with different test optotypes; An optotype plate including a second surface having an information screen portion provided with optotype information on a target, and a housing for accommodating the optotype plate, wherein one of the plurality of optotype screen portions is provided. A housing provided with an optotype window for presenting and an information window capable of confirming at least optotype information on the presented test optotype, and an optotype screen for moving an intended optotype screen portion to the optotype window An optotype presenting device, comprising: switching means. 2. The optotype presenting apparatus according to claim 1, wherein a plurality of said information screen sections are provided corresponding to said plurality of optotype screen sections. 3. The optotype presenting apparatus according to claim 2, wherein a position of said information screen portion on said second surface is substantially the same as a position of a corresponding optotype screen portion on said first surface. A target presenting apparatus. 4. The optotype presenting apparatus according to claim 2, wherein the information window is provided on the housing such that only the optotype information on the test optotype presented from the optotype window can be confirmed. An optotype presenting device, comprising: 5. The optotype presenting apparatus according to claim 1, wherein said optotype window and said information window have substantially the same size. 6. The optotype presenting apparatus according to claim 1, wherein the optotype plate is a disk-shaped rotatably housed in the housing, and the optotype screen switching means rotates the optotype plate. An optotype presenting device, which is an operation means. 7. The optotype presenting apparatus according to claim 1, wherein the test optotype is a near test optotype, and the optotype information includes a test distance for the test optotype and / or visual acuity at the test distance. An optotype presenting apparatus characterized by including a value. 8. The optotype presenting apparatus according to claim 1, wherein the test optotype is a near test optotype, and the optotype information includes the test optotype and / or a method of using the test optotype. An optotype presenting device characterized by being included.