Color blindness, also known as congenital color vision disorder, is the inability to distinguish between various colors or a particular color. Color blindness can be divided into total color blindness and monochromatic blindness, and there are more male patients than female patients. The causes of color blindness are congenital color vision abnormalities including color weakness and color blindness, and the mode of inheritance can be autosomal recessive or sex chromosomal recessive; acquired color vision abnormalities are mostly caused by acquired diseases, such as those caused by certain optic nerve diseases and retinal diseases. Second, how to determine whether a three-year-old child is color blind Judging whether a child is color blind includes a variety of methods, the more obvious color blindness is generally clear through the recognition of color, color blindness can be clear through the following methods: 1, color blindness this detection method: it is the use of the same degree of shade and different color dots composed of numbers or graphics, in the natural light at a distance of 0.5m to read. If recognition difficulties, read the wrong or can not be read, it can be confirmed that belong to the color vision abnormalities; 2, color bundle test method: is the color of different, different shades of hair bundle mixed together, so that the person being examined to pick out the same color bundle with the standard bundle. This method is quite time-consuming, and only roughly qualitative can not be quantitative, not suitable for a large area of screening inspection; 3, color mixing tester test method: its is based on the principle of red and green to form yellow, thus the design of the spectral instrument, can quantitatively record the amount of red and green light match to determine the red and green sensory abnormalities, this method can be both qualitative and quantitative. Once children are found to have color blindness, it is recommended to take acupuncture points and acupressure method or wear color blindness correction glasses to correct the treatment, the specific methods are as follows: 1, acupuncture points and acupressure method: acupressure 2 cm below the center of the eye, acupressure side exhale, one side strong pressure for 6 seconds, can effectively improve the color blindness; 2, the use of color blindness correction glasses: wear color blindness glasses, can make the correct identification of color blindness this, to correct color vision The effect of the disorder; 3, other treatment: for color blindness caused by optic nerve or retinal disease, the primary disease should be actively treated.