Which of the following conditions does the Ishihara test detect?

cones in our eyes help us see colours, without them we would be colour blind!

Player #28825483, It is the same for early pattern balding being a gene from the Mother's side of her family. My father was noticeably balding at age 18, as were my sons.

I am red green colour blind and I found it interesting that as well as not being able to see numbers that others see I also found numbers that people with "normal" colour vision don't see.

Someone told me this is mandatory for airplane personnel because he failed the test.