Color Blindness Test
About 10% of males have red-green color blindness which involves problems seeing red, green or both. This form of color blindness is rare in females. Yellow-blue color blindness is a second type but is quite rare. Even more rare is a total lack of color receptors that results in seeing only in black and white. You can check yourself for color blindness by looking at the following images and recording what numbers you see. The correct answers are listed at the bottom of the page.