But a new test will have you questioning everything ... click the button titled 'Get the next colour!' A box at the top of ...

when you look at a blank screen. This is similar to what colourblind people experience as the may lack cones sensitive to one of these three colours meaning they end up seeing a different colour.

The colour vision test has become an internet phenomenon ... The basic test involves distinguishing between blue and green using simple screen charts. The user has two buttons to choose from ...

For the first time on Wednesday evening - two days ahead of the historic Day-Night Test in Kolkata - the entire ... India set up a make-shift white sight screen in front of their nets to see ...