Congenital color vision disorders are commonly referred to as color blindness, which cannot distinguish between various colors or a certain color in the natural spectrum; Those with poor ability to distinguish colors are called weak colors. Although they can see the colors seen by normal people, their ability to recognize colors is slow or very poor.

When the light is dim, some are almost similar to color blindness or exhibit color fatigue, which is generally difficult to strictly distinguish from color blindness. Congenital factors are more common in color blindness and color weakness.

The principle of color blindness correction prescription glasses is to apply a special coating on the lens based on complementary color antagonism, which produces a cutoff wavelength effect and can transmit to long-wavelength individuals while reflecting short-wavelength individuals. Wearing color-blind glasses can make it possible to correctly identify those that were previously unclear in color-blind textbooks. Achieve the effect of correcting color vision disorders. Color blindness correction lenses are divided into contact lens type and regular glasses frames type.

Taking more vitamins at ordinary times has a special effect in preventing color blindness. Food containing vitamin A can prevent conjunctiva and cornea from drying and degeneration, and can prevent and treat "Xerophthalmia". The cornea of the eye is dry and prone to bacterial invasion and ulceration, which can cause perforation and lead to blindness. Vitamin A can also enhance the eye's ability to adapt to dark environments. It is easy to suffer from Nyctalopia when vitamin A is severely deficient. Animal I raw foods rich in vitamin A include pig liver, chicken liver, egg yolk, milk, and goat milk; Plant-based foods such as carrots, spinach, chives, green peppers, sweet potatoes with red hearts, as well as oranges, apricots, persimmons, etc.