这个app的设计者就是专业的眼科医生，真的就经常用这个东东随时给患者或者朋友查视力，专业，而且轻松。
专业：
1.集合多种常用视力表：标准的国际标准视力表（1.0）、对数视力表（5.0）以及美国（20/20）和欧洲（6/6）常用的视力表；
2.远近视力都能检查：远视力检查（排查近视眼、白内障等）以及近视力检查（检查老花眼）；
3.最清楚的视标：根据算法按照真实视力表矢量生成视标，保证视标不论多大多小都清晰，这和一般的点阵图片做的视力表不同；
4.多种视标选择：包括E字C字视标，适合不同需求；
5.结果分享：检查结果可以通过email保存起来，也可以发给被检查者。
轻松有趣：
1.界面设计非常简洁，颜色干净，有利于检查视力时候视觉不受干扰；
2.转动旋钮波轮来选择视标大小，既好玩又方便；
3.只要摇晃一下手机就可变换视标方向，非常酷，当然也可以用手指轻轻打一下屏幕，同样可以轻松变换视标方向。
This APP is developed by a real professional eye doctor. Visual acuity can be checked exactly at any time. Hmmm... Professional, Simple and Cool.
Professional:
1. A variety of common eye chart:
20/20
6/6
International standard chart (1.0)
Logarithmic chart (5.0)
2. Both Far / Near vision check
Far vision check for screening myopia, cataract etc.
Near vision check for presbyopia, amblyopia etc.
3. High resolution mark always:
The mark on the App is generated by vector algorithm. It is very different from general eye chart on the computer or App. The goodness is that visual marks are always clear whatever they are big or small.
4.Multiple types of mark: E and C, suitable for different needs.
5.Results sharing:
Results of vision check can by saved by doctors email or shared with patients by their email.
Simple and Have Fun:
1. UI is very simple and clean so it is helpful to check vision.
2. A nice knob can help user to change the size of mark. Easy and cool!
3. Want to change the direction of mark? Just shake the iphone, Fun? Also, user can tap the screen to easily change the direction of mark.