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Visual acuity chart device, vision self-testing system and self-testing method

An eye chart and visual acuity technology, applied in lighting devices, lamp circuit layout, eye testing equipment, etc., can solve problems such as inability to self-check and inability to detect vision loss in time

Inactive Publication Date: 2016-09-07
WENZHOU XINGKANG MEDICALTECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current physical examination and vision examination require the assistance of staff or medical staff to complete the examination, and they cannot perform self-examination. As a result, students study in the classroom for a long time and cannot detect changes in vision loss in time.

Method used

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  • Visual acuity chart device, vision self-testing system and self-testing method
  • Visual acuity chart device, vision self-testing system and self-testing method
  • Visual acuity chart device, vision self-testing system and self-testing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] see figure 1 , 2 As shown, an eye chart device includes an eye chart box 1, on which a light sensing element, a control circuit, and a backlight light source are arranged. The backlight source is figure 2 L2 in. The light sensing element is arranged on the outside of the eye chart box 1 to sense the brightness of external light. The light sensing element can be a photoresistor and a photodiode D1 used in this embodiment. The photosensitive diode D1 can respond to the intensity of light, and can convert light into a current or voltage signal according to the way of use. It is very sensitive to changes in light, has unidirectional conductivity, and changes the electrical characteristics when the light intensity is different. Therefore, the current in the circuit can be changed by using the light intensity.

[0051] The control circuit is connected with the light sensing element to receive its signal and perform power control to adjust the brightness of the backlight ...

Embodiment 2

[0067] see figure 2 , the control circuit can also provide the power supply voltage by the AC / DC module.

[0068] Therefore, the AC / DC module can convert alternating current into direct current, which provides another possibility for the selection of power supply, so that the input of alternating current or direct current can be performed.

Embodiment 3

[0070] The anode of the photodiode D1 is connected between the other end of the capacitor C2 and the other end of the resistor R1 through the potentiometer 331W1 . The zero point calibration can be carried out by adjusting the potentiometer 331W1. When there is a temperature shift or zero point deviation during use, it can be adjusted and compensated by the potentiometer 331W1.

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PUM

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Abstract

The invention discloses a visual acuity chart device, a vision self-testing system and a self-testing method. The visual acuity chart device, the vision self-testing system and the self-testing method solve the problems that the existing physical examination or vision check is completed only under the assistance by workers or medical staff, the self check cannot be performed, and the change of vision diminution cannot be timely found when a student studies in a classroom for a long time. The visual acuity chart device, the vision self-testing system and the self-testing method are technically characterized in that by utilizing the brightness compensation automatic control on a backlight source, the accuracy and reality of vision testing are improved, the vision change of the student can be known by a school, parents and the student self, and the effects of early finding, early prevention and early treatment are realized.

Description

technical field [0001] The invention relates to the technical field of vision detection. Background technique [0002] my country is a big myopia country. In recent years, juvenile myopia has become a common social problem. Especially the average myopia rate of teenagers in colleges, middle schools and primary schools is as high as 58%. At present, China's myopia rate is second only to Japan, the "largest myopia country", ranking second in the world. According to a joint survey by the Ministry of Health and the Ministry of Education, the incidence of myopia among Chinese students has risen from the fourth in 1998 to the second in the world in 2000. The myopia rate of primary school students is 34.17%, that of junior high school students is 54.96%, that of high school students is 80.36%, and that of college graduates is as high as 87.67%. The myopic diopter of children under the age of 13 increases by an average of 125 degrees every year, and nearly 80% of primary and midd...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B3/032H05B37/02
CPCA61B3/032H05B47/10Y02B20/40
Inventor 杜学静王勤美崔乐乐
Owner WENZHOU XINGKANG MEDICALTECH CO LTD
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