Color blindness is accompanied by X-recessive inheritance means that color blindness is inherited in a parthenogenetic manner, with the gene for the lesion located on the X chromosome. Recessive means that if a pair of genes, one dominant and one recessive, do not express the trait of color blindness, but when only the recessive gene is present, the trait of color blindness is expressed. Color blindness is a common disorder in ophthalmology associated with genetic factors, and the gene for the lesion is located on the X chromosome, also known as the sex chromosome. In color blindness, the photoreceptor cells in the retina develop abnormally, making it impossible to distinguish colors correctly. Males have only one X chromosome, while females have two X chromosomes. Therefore, when the gene for color blindness is present in only one of the X chromosomes, it will lead to the development of the disease in male patients, while female patients will develop the disease only if the gene is present in both X chromosomes, and when the gene is present in only one of the X chromosomes, they are carriers of the gene for color blindness and will not develop the disease, so it is said that color blindness is a recessive hereditary disease. Color blindness is hereditary, so it is generally recommended to do pre-marital testing in order to achieve eugenics.