Color vision

Color vision inspection methods generally include color blindness inspection mirrors, color blindness inspection lights, false homochromatic tables (color blindness check tables), and color piles. In the recruitment and physical examinations, false color tables and colored piles are often used for color vision inspection. The wavelength of visible light of the human eye is 390 to 780 nanometers. Generally, 120 to 180 different colors including 7 main colors of purple, blue, cyan, green, yellow, orange, and red can be discerned.