People are questioning whether the eye doctor's "colour blind test" really works after it went viral on TikTok. So have you tried it yet? By Lucy Marshall. 14:01, Fri, Aug 30, ...

There is also a colour blind test for toddlers, which uses shapes instead of numbers provided that young children may not be able to read. Below are several examples of the plates used.

Vernon and Straker1 claim that 5·37–9·45 per cent of colour blind men were found in Great Britain, ... The Ishihara Test for Colour Blindness. Nature 153, 656–657 (1944) ...

What Is Colour Blindness. Dr Sharma said, "A person who is colour blind is unable to distinguish between certain hues of colour. This occurs because the person may lack particular colour-sensitive ...

And with a colour-blind person who has allowed me to test his capabilities, I found this actually to be the case. But later on Mr. Pole says that pure red and pure green appear to him not yellow ...

"I was not fit for the colour blind test without my glasses, of course, but I wasn't allowed to wear them. Steven was refused a job as security at Heathrow after being told to take off his ...