Eyesight Check

With one hand and thumb,you can check your eyesight easily.

*Feature
1.Can check close eyesight(about 50cm/20inch).
2.Operate with one hand and can confirm the result immediately.
3.The result shows three places of decimals.

Identifiable eyesight.
・0.033
・0.066
・0.132
・0.264
・0.527
・1.055
・1.582
・2.109

*Memo
The result is just for your information or play use.