Color blindness, also known as color vision deficiency , is the inability or decreased ability to see color or tell colors, especially red and green. Many studies have already shown that the most usual cause is a fault of retinal cones. Color blindness is usually a sex-linked condition. Common causes still included aging, some eye problems, such as glaucoma, cataracts and macular degeneration, injury to the eye and side effects of some medicines. The most common symptom is you may see many colors, however, you only have white or black in your eyes, or blue. The one who suffers color blindness must detect it as soon as possible. The treatment options are various. Some types of color blindness needs a surgery to help with removing it, while others just needs you wear colored contacts. Wearing glasses that block glare also works for your eye problems. Learning to look for cues like brightness or location, rather than colors. Vitamins do little works for color blindness, while they have great effects on keeping eye health and removing swellings under eyes.