Whether or not color blindness can be cured depends on the type of color blindness; some cannot be cured and some may improve to some degree. People with color blindness are unable to distinguish between various colors or certain colors in the natural spectrum. There are congenital color blindness and acquired color blindness. Congenital color blindness is the most common and is a genetic disease with genetic mutations that cannot be cured, and generally affects far more males than females. Depending on the color that cannot be distinguished, it is divided into total color blindness and partial color blindness (red blindness, green blindness, blue-yellow blindness, etc.), of which, red-green blindness is the most common. Acquired color blindness, also known as acquired color blindness, is often associated with some retinal diseases, such as retinitis pigmentosa and macular degeneration, which cause damage to the cone cells and result in the loss of color discrimination. However, color-blind patients can wear color-blind corrective lenses, both corneal contact lenses and ordinary frames, which are based on the principle of complementary color topography, with a special coating on the lens that selectively allows light of a certain wavelength to pass through. Therefore, congenital color blindness is a genetic disease with mutations and cannot be cured with the current level of medical care. Acquired color blindness may improve with treatment of the primary disease.