- 手机上的视力表检查
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介绍：
这款手机软件就是手机上运行的视力表！你可以检查一下你的视力状况！但是提醒您的是：这不是医疗专业测试，您还是需要去医院去测试你的视力情况！
视力表是根据视角的原理设计的。所谓视角就是由外界两点发出的光线，经眼内结点所形成的夹角。正常情况下，人眼能分辨出两点间的最小距离所形成的视角为最小视角，即一分视角。视力表就是以一分视角为单位进行设计的。
目前所用视力表主要检查的是中心视力，即检查视网膜黄斑区中心凹视敏度，从而可简单迅速地了解到视功能的初步情况，对眼病的临床诊断治疗都有重要的意义。检查视力一般分为远视力和近视力两类，远视力多采用国际标准视力表，此表为12行大小不同开口方向各异的“E”字所组成；测量从0.1-1.5（或从4.0-5.2）；每行有标号，被检者的视线要与1.0的一行平行，距离视力表5米，视力表与被检查者的距离必须正确固定，患者距表为5米。如室内距离不够5米长时，则应在2.5米处放置平面镜来反射视力表。进行检测先遮盖一眼，单眼自上而下辨认“E”字缺口方向，直到不能辨认为止，记录下来即可。正常视力应在1.0以上。若被测试者0.1也看不到时，要向前移动，直到能看到0.1为止，其视力则是“0.1×距离/5=视力”；若在半米内仍看不到0.1，可令被测试者辨认指数，测手动、光感等。按检查情况记录视力。近视力多用“J”近视力表，同样方法辨认“E”字缺口方向，直到不能辨认为止，近距离可自行调整，正常近视力在30厘米处看清1.0一行即可，近视力检查有助于屈光不正的诊断。
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Description:
Table visual perspective is based on the principles of design. The so-called perspective from the outside world is issued by the two points of light, with eyes formed by the junction angle. Under normal circumstances, the human eye can distinguish between the minimum distance between two points formed by the perspective of the smallest perspective, that is one perspective. Vision is to table a perspective for the design of the units. Currently used by the major visual inspection is the central vision, that is, check retinal macular Center Au as sensitivity, which can be as simple quickly learned that the initial function, the clinical diagnosis and treatment of eye disease has important significance. Check into the general vision and far vision of two types of short-sighted, far more than vision of international standards visual form, this form to open 12 firms of different sizes of different direction "E" word by the composition of measurement from 0.1-1.5 (or from 4.0-5.2); per line labeling, the seizure of the line of sight to a line parallel with the 1.0, 5 meters from the visual form, scale and the visual inspection was the distance must be fixed properly, the patient from the table to five meters. If not enough room from five meters long, 2.5 meters should be placed plane mirror reflection to visual form. Covering a first test, top-down identification of single-lens reflex "E" word gap direction until Bunengbianren, the record can be. Normal vision should be 1.0 or above. If the test were 0.1 also can not see, it is necessary to move forward, until the date to see 0.1, its vision is "0.1 × distance / 5 = vision" if the Half-meter still do not see 0.1, can be Test to identify the index, measured manually, light flu. By visual inspection records. Myopia of the use of "J" short-sightedness of the table, the same method to identify "E" word gap direction until Bunengbianren far, close to self-correction, the myopia of the normal 30 cm and his entourage to see 1.0, the myopia of the inspection will help Refractive errors in the diagnosis.
- 以上英文同步翻译为海鱼手机加瓦站系统机器自动翻译，不准确之处敬请谅解。