Objective to develop a kind of intelligent visual acuity test chart for the subject to test their visual acuity by themselves.

目的研制一种智能视力表，实现被检测者自助检测视力。

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Visual acuity - As part of the testing, you'll be asked to read letters on a distance chart. This test measures visual acuity, which is written as a fraction such as 20/40.

视觉灵敏度检测——作为视力检测的组成部分，你需要读出视力表上的字母以测出你的视觉灵敏度，它可以写成分数的形式，比如20/40。

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