Loss of color vision is defined as an insensitivity to the ability to discriminate between certain colors or colors. According to the doctrine of the three primary colors, loss of color discrimination of one color is called dichromatic vision, and loss of red color discrimination is called red-blindness. Such a person has a shortened red end of the spectrum, is less sensitive to the red color of the spectrum, and sees it as a dark color. He drives through red lights, often because the red light is not bright enough for him. Here’s how to effectively prevent and treat color vision loss. 1, acupuncture points and acupressure acupressure is located in the center of the eye 2 cm below the “four white”, can improve eye function. Acupressure is performed by exhaling while using the index finger to apply strong pressure for 6 seconds. Acupressure can be applied with eyes open or closed. Acupressure with open eyes can clearly determine colors, while acupressure with closed eyes can treat abnormal vision and pseudomyopia. If you have strong color abnormalities, you should focus on strong pressure under your eyes. If you keep doing this kind of acupressure, you will gradually get rid of color vision abnormalities. In the morning before washing the mirror, it is advisable to apply acupressure once, and for women, it is advisable to apply acupressure at night after disrobing. 2, color blindness corrective lenses – an effective way to correct color blindness The principle of color blindness corrective lenses, according to the complementary color antagonism, special coating on the lens to produce the effect of cut-off wavelength, for long wavelengths can be transmitted, for short wavelengths occur reflection. By wearing color-blind glasses, the original color-blind chart that was not recognizable can be correctly recognized. The effect of correcting color vision is achieved. There are two types of corrective lenses for color blindness: contact lenses and wide frames. Since color blindness and color deficiency are hereditary diseases that can be passed on to offspring, it is an effective preventive measure to avoid marrying close relatives and to investigate each other’s family history of hereditary diseases before marriage, and to take measures to reduce the birth rate of color blind offspring.