JP3259920B2 - Eye test - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a visual acuity test apparatus for performing a visual acuity test based on the response of a subject.

[0002]

2. Description of the Related Art In general, a visual acuity test involves presenting a test subject with a visual target and responding to the appearance. As a visual acuity testing device, a visual acuity testing device that individually presents a target to be read by a subject from among a plurality of targets is proposed instead of a conventional visual acuity table printed on one sheet. . In addition, an apparatus has been proposed in which a response of the appearance to a target presented to the subject is input to the subject itself, and the response is automatically processed based on a predetermined standard to determine a visual acuity value. ing.

[0003]

However, in an apparatus for simply presenting the former target individually, it is necessary for the examiner to memorize the type of the presented target and the correctness of the response. It is not unusual for an operation error to occur and for the same target to be presented twice, for example, and for an appropriate maximum visual acuity not to be obtained. Further, in the latter device in which the subject himself / herself inputs the response, due to the limitation of the response input means, the target to be presented is practically limited to the target having a configuration such as a four-way Landolt ring that allows easy input. However, there is a drawback that it cannot be used for a character target or a pattern target. Further, when the subject is an infant or an elderly person, the input itself is impossible. As described above, the apparatus in which the subject himself / herself inputs correct / wrong has many disadvantages in practical use, and performs only the function of screening. The present invention has been devised in view of the above-described drawbacks, and has as its technical object to provide a visual acuity test apparatus that can perform a visual acuity test accurately and easily.

[0004]

The present invention has the following features in order to achieve the above object. (1) A visual acuity test apparatus including a target presenting unit that selectively presents a target to a subject from among a plurality of targets and a selecting unit that selects a target to be presented to the target presenting unit. , de relates correctness of the response of a subject for presentation to the optotype - input means for <br/> enter data, selection signal and said input of said selection means
Subject answered correctly based on the data input to the force means
Display means for simultaneously displaying a plurality of targets to the examiner .

(2) In the visual acuity test apparatus of (1),
Optotypes simultaneously displayed on the display means have the same visual acuity value.
It is a target .

(3) In the visual acuity test apparatus of (1),
The display means is further characterized in that the target to which the subject has answered incorrectly is displayed so as to be distinguished from the target to which a correct answer has been given.

[0007]

[0008]

[0009]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an optotype presenting section, and FIG. 2 is a perspective view showing an optotype operating section for operating the optotype presenting section. An optotype selecting switch 2 is disposed on the optotype operating section 1, and a mini pattern of optotypes is attached to each of the selection switches so as to correspond to the optotype array of the optotype presenting section. Reference numerals 3 and 4 denote switches for inputting the correctness of the response of the subject.
Press the wrong answer switch 4 if it is incorrect. Optotype operation unit 1
Has a transmission light emitting window 5. The optotype presenting section 6 is provided with a light receiving window 7 for receiving a signal from the transmitting light emitting window 5. Many optotypes are arranged in the optotype presenting unit 6, and individual illumination light sources are arranged at the rear of each optotype, and the optotypes to be interpreted are presented to the subject by selectively turning on the illumination light sources. I do.

FIG. 3 is a functional block diagram for explaining a control system of the present apparatus. The switch signal of the optotype operating unit 1 is processed by the signal processing circuit 10 inside the optotype operating unit and is input to the optotype operation control unit 11. The optotype operation control section 11 converts a signal relating to the optotype selection and the correctness of the response to be described later into an infrared pulse signal via the transmission light emitting section 12 and converts the signal into an infrared pulse signal.
Send to 3. The signal received by the light receiving unit 13 is processed by the signal processing circuit 14 and then input to the optotype presenting control unit 15. The optotype presenting control unit 15 has an optotype presenting program described later, and stores a correct / incorrect signal of a response to the presented optotype. The optotype presenting control unit 15 turns on or off the lamp 17 via the lamp driving circuit 16.

The operation of the visual acuity testing apparatus having the above configuration will be described. When an arbitrary optotype selecting switch 1 is pressed by the examiner, the switch signal is transmitted to the light receiving section 13 of the optotype presenting section via the transmitting light emitting section 12 or the like. The signal received by the light receiving unit 13 turns on the corresponding lamp 17 via the optotype presenting control unit 15, the lamp driving circuit 16, and the like, and presents the optotype to the subject. FIG. 4 shows this state.
The correct / incorrect signal of the subject's response is similarly transmitted to the optotype presenting control unit 15.

The optotype is presented as follows according to a programmed procedure. 5 and 6 show a procedure in a case where the response to the target presented first is correct and the correct answer switch 3 is pressed. In the figure, 〇 indicates that the response was correct,
× indicates that the response was incorrect, and arrows indicate the lighting order. If the first response is correct, the next target immediately below (the target at the stage with a high visual acuity value) is presented, and thereafter the target is immediately lowered until the wrong answer switch 4 is pressed or the target disappears. Is turned on. When the wrong answer switch 4 is pressed, the rightmost optotype of the optotypes having the same visual acuity value and not yet presented is presented until the presence or absence of the visual acuity at that stage is determined. The optotype on the left side is sequentially turned on regardless of the correctness of the response. If three out of five (or two out of three) correct targets of the same stage are obtained, the optotype operation control unit 11 determines that there is visual acuity at that stage. When it is determined that there is a certain level of visual acuity, the rightmost target that has not yet been presented among the one level higher visual acuity values is presented, and when it is determined that there is no certain level of visual acuity, a one level lower visual acuity value The rightmost optotype not yet presented is presented, and the left optotype is sequentially presented until the presence or absence of visual acuity at that stage is determined. The measurement ends when the above operation is repeated and the maximum visual acuity is obtained.

When the optotype operation control section 11 determines that the highest visual acuity is obtained, all optotypes for which the correct answer switch has been pressed are presented. ). This state is shown in FIG. The optotype presenting control unit 15 stores the signal of the correct / incorrect switch, and based on the signal that determines that the maximum visual acuity of the subject has been obtained, the optotype presenting control unit 15 determines the optotype for which the correct answer switch 3 is pressed. All are presented. Next, FIG. 8 shows a procedure in a case where the response to the initially presented target is incorrect and the wrong answer switch 4 is pressed. In the case of an incorrect answer, the optotype immediately above the presented optotype is presented, and the optotype immediately above it is sequentially presented until the correct answer switch 3 is first pressed. When the correct answer switch 3 is pressed for the first time, the procedure is almost the same as described above.

The above embodiment can be variously modified.
In the embodiment, all the targets have been described with reference to the Landolt ring. However, it is clear that a target including a mixture of hiragana as shown in FIG. 9 can be applied, and the type of the target is not limited. When a simple Landolt ring is used, a method in which the subject inputs a response may be employed. In the present embodiment, the optotype presenting program and the program for determining the maximum visual acuity are provided in the optotype presenting section. However, the optotype operating section or a relay device connected thereto may be provided.

[0015]

According to the visual acuity test apparatus of the present invention, a visual acuity test can be performed accurately and easily.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an optotype presenting section.

FIG. 2 is a perspective view showing an optotype operating unit.

FIG. 3 is a functional block diagram illustrating a control system of the apparatus.

FIG. 4 is a perspective view of an optotype presenting section showing a case where a first optotype is presented.

FIG. 5 is an explanatory diagram showing an example of a procedure when a first response is correct.

FIG. 6 is an explanatory diagram showing another example of the procedure when the first response is correct.

FIG. 7 is an explanatory diagram showing a display of the optotype presenting unit after the highest visual acuity is obtained.

FIG. 8 is an explanatory diagram showing an example of a procedure when an initial response is incorrect.

FIG. 9 is an explanatory diagram showing an example in which a target having a different shape is used.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 optotype operating section 2 optotype selection switch 3 correct answer switch 4 wrong answer switch 5 light emitting window for transmission 6 optotype presenting section 7 light receiving window

Claims (3)

(57) [Claims] 1. A visual acuity test comprising: an optotype presenting section for selectively presenting an optotype to a subject from among a plurality of optotypes; and selecting means for selecting an optotype to be presented on the optotype presenting section. Equipment smell
The correctness of the subject's response to the presented target
Input means for inputting data, and a selection signal of the selection means
And the subject is input based on the data input to the input means.
A display means for simultaneously displaying a plurality of correctly answered optotypes to the examiner . 2. The visual acuity test apparatus according to claim 1, wherein
Optotypes simultaneously displayed on the display means are optotypes of the same visual acuity value.
Vision testing apparatus, characterized in that it. 3. The visual acuity testing apparatus according to claim 1, wherein
The visual acuity test apparatus, wherein the display means further displays the optotype to which the subject has answered incorrectly, in distinction from the optotype to which the subject has correctly answered.