價格：免費
檔案大小：4.3 MB
版本需求：需要 iOS 3.2 或以上版本。與 iPhone、iPad 及 iPod touch 相容。
支援語言：英語
Here’s your chance to test your vision! The letters are randomized like a slot machine to prevent any cheating. There is also a color blindness test to assess if you have normal color vision or not. Jot down the numbers hidden within each image and compare your results with your friends!
支援平台：iPhone, iPad