經由七張顏色數字的判斷，就可以檢測出是否有色盲或色弱的症狀。

It is a iPhone app that you can test easily if you are color blind. Click a number same as a displayed image (7 times ). If a test is over, you will know whether you are color-blind.

http://itunes.apple.com/us/app/color-blind-test/id332009519?mt=8