Weak color is also called "abnormal trichromatic vision". Color vision defect. Mild color blindness, able to recognize colors, but low sensitivity. Patients with weak color have poor ability to distinguish colors, and can only see colors when they are saturated; Only when the wavelength difference is large can we distinguish the change of the bright phase. Red and green are more common, and blue is extremely rare. Weak red has poor ability to distinguish red; Weak green has poor ability to distinguish green. The patients with weak color are mostly men.
Color blindness and color weakness are collectively called color vision disorders, which are divided into two categories: congenital and acquired. Red-green color blindness is the most common congenital color vision disorder, which is a genetic disease and is recessive through sexual linkage. In other words, a color-blind person passed his genes from his daughter to his grandson. That is to say, his grandfather showed red-green color blindness and passed it on to his daughter, but his daughter did not show color blindness but passed on the genetic factors to his son, that is, his grandson showed color blindness. Only daughters born to mothers with color vision disorder genes and color-blind fathers show color blindness. Therefore, the incidence of color blindness in men is higher than that in women, which is five times that of women.
Congenital color blindness or color weakness is a hereditary disease, which is related to gender. Clinical investigation shows that male color blindness accounts for 4.9%, while female color blindness accounts for only 0. 18%, and the number of male patients greatly exceeds that of female patients. This is because the genetic gene of color blindness exists on the X chromosome of sex chromosome and adopts the recessive inheritance mode of sex linkage. Usually, men are color blind, and women are color blind gene carriers with normal appearance, so there are more color blind men than women.
Congenital color vision disorder remains unchanged for life, and there is no specific treatment at present. Red or green soft contact lenses can be worn to correct it. Some people try acupuncture or traditional Chinese medicine, which is said to have certain effect, but it is still in the clinical research stage. Because color blindness and color weakness are hereditary diseases and can be passed on to future generations, it is an effective preventive measure to avoid consanguineous marriage and investigate the genetic disease history of the other family before marriage and take measures to reduce the birth rate of color blindness offspring.