Optical lens and visual acuity examination device

An optical lens and lens technology, applied in the field of optical lenses, can solve problems such as high cost and large space for vision inspection equipment, and achieve the effect of alleviating large space and high cost

Pending Publication Date: 2020-02-07
武汉真元生物数据有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of this, the purpose of the present invention is to provide an optical lens and a visual inspection device, to alleviate the technical problems of large space and high cost of visual inspection equipment in the prior art, and to detect myopia in time and prevent it early

Method used

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  • Optical lens and visual acuity examination device
  • Optical lens and visual acuity examination device
  • Optical lens and visual acuity examination device

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Embodiment 1

[0034] Aiming at the defects of the above prior art, the present invention provides an optical lens to virtualize a standard test distance of 5 meters, aiming to provide users with a space-saving, low-cost, and portable vision inspection lens, so as to detect vision changes in time , Early intervention, the purpose of preventing vision deterioration.

[0035] figure 1 It is a schematic diagram of an optical lens provided according to an embodiment of the present invention. In order to show the characteristics of the present embodiment, only the structure related to the present embodiment is shown, and the rest of the structures are omitted, wherein IMA is the entrance pupil of the human eye, or the assembly position of the image sensor, OBJ is the position of the eye chart or the visual mark E, and OA is optical axis.

[0036] Such as figure 1 As shown, the optical lens includes in sequence from the object side to the image side: a first lens 10 with negative diopter and a ...

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PUM

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Abstract

The invention provides an optical lens and a visual acuity examination device. The optical lens comprises, in order from an object side to an image side: a first lens with negative diopter, and a second lens with positive diopter, wherein the first lens and the second lens are both aspheric lenses, and the first lens and the second lens both have at least one aspheric surface; and the optical lenssatisfies the condition:EFL / TTL is greater than or equal to -3.6 and is less than or equal to -2.9. The optical lens provided by the invention alleviates the technical problems of large space and high cost required for the visual acuity examination equipment in the prior art.

Description

technical field [0001] The invention relates to the technical field of optical lenses, in particular to an optical lens and a visual inspection device. Background technique [0002] With the advancement of technology and the development of society, mobile electronic devices such as mobile phones have become a necessity in our lives. People spend a lot of time every day by reading the content displayed on electronic devices to obtain knowledge and entertainment content, which makes the eyestrain worse. The number of people who lead to myopia is gradually increasing. According to the latest survey by the Ministry of Education and the Ministry of Health, there are more than 400 million myopia patients in my country, among which the myopia rate of primary school students is more than 30%, and that of middle school students and college students is as high as 70%. In addition, after teenagers suffer from myopia, the average annual increase will be 50-75°. Therefore, vision preventi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/18A61B3/032
CPCA61B3/032G02B13/0015G02B13/003G02B13/0055
Inventor 魏长伟刘黎钦培张锐庞煜卿
Owner 武汉真元生物数据有限公司
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