There is a book with the ability to recognize colors, which has a pattern composed of three colors. This book can also be found on the Internet. You can directly test it yourself by Baidu.

Congenital color vision disorder is usually called color blindness, which can not distinguish various colors or some colors in the natural spectrum. The poor ability to distinguish colors is called color weakness, and the boundary between it and color blindness is generally not easy to distinguish strictly, but the severity is different.

Color-blind (weak) patients are born with no correct color discrimination ability, and think that others are the same as themselves, so they don't feel sick. Many color-blind patients have no abnormal findings in eye examination. When the red and green colors are particularly obvious or single, patients often distinguish them by unique experience, so color blindness (color weakness) can only be judged by special color vision examination. The methods of color vision inspection generally include color blindness inspection mirror, color blindness inspection lamp, false homochromatic table (color blindness inspection table) and color hair bundle.

You can wear a pair of color blindness and color weakness correction glasses when you take the college entrance examination, so that you can see the map clearly and outsiders will not find it. Add the screen name Mingmei color visual consultation.