Color blindness is an abnormal color vision disorder in which the eye has no ability to discriminate between colors. There are many ways to detect color blindness: the first, pseudo-identical color chart, or the commonly used color blindness book test, is the most widely used test method and is very simple and convenient. The second, color alignment detection, includes the FM-100 hue detection method and the D-15 hue check method. The third, color blindness microscopy, is an instrument that determines the type of color vision defect by special color matching. This disorder is a congenital genetic disorder, so there is no effective way to treat or improve the symptoms. If this disease exists, it can affect normal life and limit the choice of occupation.