It turned out that he was a green blind patient. In an art training class, a kid who painted very well always painted the sun green and tree crowns and grass brown. The patient cannot distinguish between light green and dark red, purple and cyan, magenta and gray, and treats green as gray or dark black. over 8% of men and 0.5% of men have from it.Ĥ TYPES OF RED GREEN COLOR BLIND Deuteranopiaĭeuteranopia is the most serious form of red-green color blindness.

Trichromacy: Trichromacy has the functions of three cone cells, but the light-sensitive spectrum of one of them has shifted, resulting in deviation of color perceptionĪbout 99% of all color blind people are red green color blind. Monochromacy:Monochromatic perception, that is, complete color blindness, loss of two or three cone cell functionsĭichromacy: Two-color perception, that is, loss of red/green/blue cone cell function Therefore, the cause of color weakness/color blindness is that the function of one/several types of cone cells is affected, which makes the patient’s perception of color worse than ordinary people.īecause we have three types of cone cells, there are also grades for color weakness/color blindness: When light enters our eyes, these cone cells will produce different excitement according to the wavelength of the light, and then transmit the signal to our brain, allowing us to acquire the ability to recognize colors. The average person has three types of cone cells, which can sense light of different wavelengths (including blue, green, and red, which are the three primary colors of light).

The eye can recognize colors because there are cells called cone cells in the retina.

Green red color blind test for kids