JP3547184B2 - Eye test - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a visual acuity test apparatus that presents a target to an examinee's eye.
[0002]
[Prior art]
The visual acuity test presents a visual target to be read to the subject, makes the subject respond to the appearance of the presented visual target, and determines the visual acuity based on the correctness.
The optotypes are usually arranged vertically or horizontally in a row for each visual acuity value, and the test subject is presented with a row of optotypes at the same time, and all or some of the optotypes are tested according to the instruction of the examiner.
[0003]
[Problems to be solved by the invention]
However, in the case of the same visual acuity value as in the above-described apparatus, since the presented target is always the same, the right eye, left eye and both eyes are examined and the examination step is performed for the same subject. In the meantime, the subject may memorize the configuration of the optotype, and there is a problem that it is impossible to distinguish between a response based on the memory and a response based on the memory.
In the past, it was conceivable to prepare optotypes for the right eye, left eye, or both eyes, but not only had to prepare many optotypes, but also each time the test eye was changed. It is troublesome to change the size, and there is a problem that the inspection is troublesome.
[0004]
The present invention has been made in view of the above problems, and has as its technical object to provide an eyesight inspection apparatus having a simple configuration that makes it difficult to make a response based on a memory of a subject.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention is characterized by having the following configuration.
(1) In a visual acuity test apparatus that presents to a subject an optotype sequence in which a plurality of optotypes having the same visual acuity value are arranged in a row by masking a part of the optotype screen, the same type (hiragana character visualization) And a plurality of optotype columns having the same visual acuity value for at least a part of the visual acuity values, and at least a part of the configuration of the optotypes is different in the plurality of optotype columns. One of the target rows can be selectively presented to the subject, and the target screen switching means for switching the target screen and the mask switching means for switching the mask are operated as desired. A target sequence switching presenting means for presenting a target sequence to be examined to the subject, and a case where the most recently presented target sequence is included in the plurality of target sequences in response to an operation signal of the examiner. Again presents the optotype sequence with the same visual acuity value as the most recently presented optotype sequence. And a program storage unit for storing a program for selecting an optotype sequence having a configuration different from the most recent optotype sequence from the plurality of optotype sequences .
[0006]
(2) By applying a mask to a part of the target screen, a visual test apparatus that presents a target array in which a plurality of targets having the same visual acuity value are arranged in a row to the eye to be inspected has the same type (hiragana character visualization). And a plurality of optotype columns having the same visual acuity value for at least a part of the visual acuity values, and at least a part of the configuration of the optotypes is different in the plurality of optotype columns. One of the optotype rows can be selectively presented to the subject, and the optotype screen switching means for switching the optotype screen and the mask switching means for switching the mask are operated. a visual target columns target sequence changeover presentation means vision presenting to the subject sake, when presenting target sequence view of the same visual acuity value of the plurality of rows, when viewed in the plurality of rows in the right and left switching of the subject It is divided or presenting any target sequence, switching the left and right of the eye And a program storage means for storing a program for selecting a target sequence to be presented based on a signal of a changeover switch and an operation signal by an examiner from the plurality of target sequences .

[0011]
Embodiment 1
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating a schematic configuration of a visual acuity inspection apparatus according to an embodiment. Reference numeral 1 denotes a projection type target presenting apparatus, which projects a test target on a projection screen 2 which is separated by a predetermined test distance. Reference numeral 3 denotes a remote controller for switching the target presented by the target presenting apparatus 1.
[0012]
FIG. 2 is a diagram illustrating the configuration of the optotype presenting apparatus 1. Reference numeral 10 denotes a halogen lamp serving as a light source for illumination, and 11 denotes a condenser lens. Reference numeral 12 denotes a chart disk made of glass or the like. A large number of rectangular sections are arranged on the same circumference of the chart disk 12 in accordance with the size of the projection screen 2, and a large number of test targets are provided. Are divided into sections and drawn by chromium evaporation. The test optotype includes an optotype for inspecting a visual acuity value, and an optotype screen having the configuration shown in FIG. 3 (an optotype screen refers to one screen in a presentation frame, but corresponds to the projected section). This is included (in the embodiment, those relating to other optotypes are omitted for simplicity of description). A hiragana character optotype having a visual acuity value of 0.2 / 0.3 / 0.4 is arranged on the optotype screen 12a, and a visual acuity value of 0.5 / 0.6 / 0.7 on the optotype screen 12b. Character optotypes having a visual acuity value of 0.8 / 0.9 / 1.0 are arranged on the optotype screen 12c, and text optotypes having a visual acuity value of 1.2 / 1.5 / 2.0 are arranged on the optotype screen 12d. In addition, the device has an optotype screen 12e that has the same visual acuity value (0.9 / 1.0 / 1.2) as the optotype screens 12c and 12d but a different configuration. The optotype configuration of the optotype screen 12e is obtained by selecting optotypes of visual acuity values that are frequently used in the examination, and it is desirable to have several overlapping optotypes of visual acuity values if there is room.
[0013]
The chart disk 12 is rotated by the motor 13 to switch the target screen.
Reference numeral 14 denotes a mask plate for applying a necessary mask to the optotype screen. The mask plate 14 is rotated by a motor 15 to switch the type of mask applied to the optotype screen. The mask of the mask plate 14 presents a row of optotypes having the same visual acuity value and has a horizontal mask for hiding others.
The light beam emitted from the halogen lamp 10 is condensed by the condenser lens 11 and illuminates the mask of the mask plate 14 and the chart chart of the chart disk 12. The target illuminated through the mask plate is projected on the projection screen 2 by the projection lens 16 and presented to the eye to be examined.
[0014]
FIG. 4 is a diagram showing the configuration of the remote controller 3. Reference numeral 20 denotes a window for transmitting data to and from the optotype presenting apparatus 1, and a light emitting unit having an LED for transmitting an optical signal is provided inside. Reference numeral 21 denotes a liquid crystal display unit, which displays the visual targets presented by the visual target presenting apparatus 1 and their visual acuity values. Reference numeral 22 denotes an optotype screen selection switch for switching the optotype screens 12a to 12e. Reference numerals 23a and 23b denote mask switches for applying a horizontal mask so that the target projected on the projection screen 2 is presented in only one line.
[0015]
FIG. 5 is an electric block diagram of the apparatus. The signal input by each switch of the remote controller 3 is converted into an optical signal by the light emitting section 31 via the microcomputer 30 and sent to the light receiving section 40 of the optotype presenting apparatus 1. The signal received by the light receiving unit 40 is input to the microcomputer 41 after being subjected to predetermined processing. The microcomputer 41 drives the chart disk motor 13 and the mask plate motor 15 via the drive circuits 42 and 43 in accordance with the input signals to rotate the chart disk motor 15 and present the optotypes and mask. I do.
Further, the microcomputer 30 displays the information of the presented target on the display unit 21 via the display circuit 32. Further, the microcomputer 30 stores a program for switching targets to be described later, and executes the program in accordance with switch signals of the mask switches 23a and 23b.
[0016]
Next, the operation of the apparatus having the above-described configuration will be described based on the example of the target presenting shown in FIG. FIG. 6 is a diagram in which the operation procedures (1) to (10) of the mask switch correspond to the optotype screen and the presenting optotype array at that time.
In order to present an optotype for each visual acuity value, first, an optotype screen is selected by the optotype screen selection switch 22, and then the mask switch 23a or 23b is pressed to start the optotype presenting program. (1) to (10) correspond to the reference numerals of the operation procedure in FIG.
[0017]
(1) The optotype screen 12c of FIG. 3 is selected by the optotype screen selection switch 22 and the mask switch 23a is pressed, so that the mask is displayed so that the uppermost row of optotypes (a visual acuity value of 0.8) is presented. Take it.
(2) When the mask switch 23b is pressed, an optotype sequence with a visual acuity value of 0.9 is presented.
(3) The mask switch 23b is pressed to set the presented target to a visual acuity value of 1.0. The apparatus switches masks so as to present a group of optotypes having a visual acuity value of 1.0 below the same optotype chart 12c.
[0018]
(4) When the examiner presses the mask switch 23a again to examine the visual acuity value 0.9, the apparatus switches the visual target screen to the visual target screen 12e with the visual acuity value of 0.9 / 1.0 / 1.2. Then, a mask is applied to this, and an optotype sequence different from the optotype sequence previously presented with the visual acuity value of 0.9 is presented. The apparatus stores, for an optotype that has the same visual acuity value and is not presented at the same time, the optotype (a series of optotypes) presented immediately before, and presents the optotype with the same visual acuity value next time. Is instructed to present a different target.
(5) When the mask switch 23b is pressed again to set the optotype to the visual acuity value of 1.0, an optotype sequence with the visual acuity value of 1.0 on the optotype screen 12e is presented.
(6) Next, when the mask switch 23b is pressed to present the optotype with the visual acuity value of 1.2, the optotype screen 12e displays the same optotype sequence with the same visual acuity value of 1.2 below.
[0019]
(7) When the mask switch 23a is pressed again so as to present the optotype sequence having the visual acuity value of 1.0, the optotype screen is switched to the optotype screen 12c different from (5), and the visual acuity value of this optotype screen is 1 A target sequence of 2.0 is presented.
(8) Further, when the mask switch 23b is pressed to present the target group having the visual acuity value of 1.2, the apparatus will have a visual acuity value of 1.2 / 1.5 / 2.0 different from the visual target screen 12e presented last time. Is switched to the target screen 12d.
(9) When the mask switch 23b is pressed after (8) , an optotype sequence having a visual acuity value of 1.5 below one row of the optotype screen 12d is presented.
(10) again, press the mask switch 23a so as to present the target sequence vision visual acuity 1.2, the device again to another target screen 12e and target screen 12 d of the previous visual acuity value 1.2 Switching, masking the mask, and presenting a target sequence having a visual acuity value of 1.2.
[0020]
In this way, when the optotype group having the same visual acuity value is selected again, the apparatus presents an optotype group having a different configuration from the previously presented optotype group. Thus, even if the subject once memorizes the contents of the visual acuity table, the target content of the same visual acuity value to be presented next is different, so that the memory of the subject is useless, and an accurate visual acuity test can be performed.
Further, the examiner can easily switch the optotype only by operating the mask switches 23a and 23b without being aware that the optotype content is being changed.
[0021]
Embodiment 2
FIG. 7 is a diagram illustrating a schematic configuration of a device according to the second embodiment. The second embodiment is an example of a visual acuity test performed using the subjective refraction power test device 50. The subjective refraction test apparatus 50 has optical elements having various characteristics in its left and right units, and switches and arranges the optical elements in an inspection window to subjectively test the refraction power and the like of the eye to be inspected.
[0022]
Reference numeral 51 denotes a control unit for controlling the operation of both the subjective refraction test apparatus 50 and the optotype presenting apparatus 1, and is connected to both apparatuses by a cable. In the control section 51, in addition to the chart switch 22 and the mask switches 23a and 23b corresponding to the switches arranged in the remote controller 3 of the first embodiment, an inspection window of the subjective refracting power inspection apparatus 50. Switches 52 for designating switching items of the spherical lens, the cylindrical lens, and the astigmatic axis to be arranged on the lens, a knob 53 for switching the value of each lens selected by the selection switch group 52, an eye to be inspected (left eye, right eye) An eye selection switch 54 for selecting an eye and both eyes) is disposed. For example, when the right eye switch 54a is pressed by the examinee's eye selection switch 54, the left side of the subject's eye of the subjective refraction power inspection apparatus 50 is shielded and the right eye can be examined. When the left eye switch 54b is pushed, the left eye examination can be performed. it can.
[0023]
The apparatus according to the second embodiment controls the switching of the optotype screens 12c, 12d, and 12e of the optotype presenting apparatus 1 having the optotype arrays having the overlapping visual acuity values in accordance with the switch signal of the eye selection switch 54. That is, for example, the optotype screens 12c and 12d are used for presenting the optotype with the visual acuity value of 0.9 / 1.0 / 1.2 at the time of the right eye examination, and the optotype screen 12e is used at the time of the left eye examination. use. Thus, it is possible to prevent the target learned during the right eye examination from being answered during the left eye examination based on the memory.
[0024]
Embodiment 3
In the first and second embodiments, an example is shown in which a plurality of mutually independent optotype groups having the same visual acuity value are prepared and the optotype groups to be presented are switched. This is an example in which the configuration of a target to be presented is changed by sharing and modifying the mask of the target presenting apparatus 1.
In the optotype screen shown in FIG. 8A, the first mask presents only four characters from the left as shown in FIG. 8B, and the second mask shows the right from the right as shown in FIG. Present 4 characters. By switching between these two types of masks, different target groups can be presented.
As a modification of the third embodiment, a target group is formed by preparing a target screen having a large number of targets having the same visual acuity value and forming a mask so as not to have the same target.
[0025]
In the above embodiment, the projection type target presenting apparatus has been described as an example. However, the target presenting apparatus is not limited to this type, and the back side illuminating type of illuminating the film on which the target is printed from behind is used. The present invention can be applied to various optotype presenting apparatuses.
The presentation target is not limited to the hiragana character, but may be a Landolt ring or another character. As described above, the present invention can be variously modified.
[0026]
【The invention's effect】
As described above, according to the present invention, different optotypes can be presented even if the same visual acuity value is repeatedly inspected without increasing the number of complicated elements.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a schematic configuration of a visual acuity inspection apparatus according to a first embodiment.
FIG. 2 is a diagram illustrating a configuration of an optotype presenting apparatus according to the first embodiment.
FIG. 3 is a diagram showing an optotype screen for explaining the configuration of an examination optotype.
FIG. 4 is a diagram showing a configuration of a remote controller 3;
FIG. 5 is an electric block diagram of the device according to the first embodiment.
FIG. 6 is a diagram showing an optotype presenting example in which an operation procedure of a mask switch is associated with an optotype screen and a presenting optotype sequence at that time.
FIG. 7 is a diagram illustrating a schematic configuration of an apparatus according to a second embodiment.
FIG. 8 is a diagram illustrating an example of an optotype screen and mask switching of the apparatus according to the third embodiment.
[Explanation of symbols]
DESCRIPTION OF REFERENCE NUMERALS 1 optotype presenting apparatus 3 remote controller 12 chart disks 12a, 12b, 12c, 12d, 12e optotype screen 14 mask plate 22 optotype screen selection switches 23a, 23b mask switch 30 microcomputer

Claims (2)

By applying a mask to a part of the optotype screen, a visual acuity test apparatus that presents an optotype sequence in which a plurality of optotypes having the same visual acuity value are arranged in a row to the eye to be inspected has the same type (hiragana character optotype or Landolt). A plurality of visual target columns having the same visual acuity value for at least a part of the visual acuity values, and at least a part of the configuration of the visual target is different in the plural visual target columns. One of the target sequences can be selectively presented to the subject, and the target is intended by operating the target screen switching means for switching the target screen and the mask switching means for switching the mask. An optotype switching means for presenting a row to the subject; and a case where the most recently presented optotype row is included in the plurality of rows of optotype rows in response to an operation signal of the examiner. When target sequence of presenting the optotype sequence identical visual acuity value again presenting to The visual acuity testing apparatus, characterized in that it comprises a program storage means for storing a program to be selected from among the target sequence said plurality of optotypes column view of the structure different from the most recent optotype column. By applying a mask to a part of the optotype screen, a visual acuity test apparatus that presents an optotype sequence in which a plurality of optotypes having the same visual acuity value are arranged in a row to the eye to be inspected has the same type (hiragana character optotype or Landolt). A plurality of visual target columns having the same visual acuity value for at least a part of the visual acuity values, and at least a part of the configuration of the visual target is different in the plural visual target columns. One of the target sequences can be selectively presented to the subject, and the target is intended by operating the target screen switching means for switching the target screen and the mask switching means for switching the mask. a target sequence changeover presentation means vision presents a column to the subject, in the case of presenting the target sequence view of the same visual acuity value of the plurality of rows, one optotype column of the plurality of rows in the right and left switching of the subject It is divided whether to present, switching scan for switching the left and right of the eye Vision testing apparatus characterized by comprising: a program storage means for storing a program for selecting a target sequence vision presented based on the pitch signal and the operation signal by the examiner from the optotype columns of said plurality of rows, the .

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