The 6 to 7 million cones in the human retina are responsible for color vision, and these photoreceptors are concentrated in the central zone of the retina called the macula. Rods are more plentiful (there are approximately 100 million rods in the human retina) and they are more sensitive to light, but rods are incapable of perceiving color. Photoreceptors in the retina are called rods and cones. SEE ALSO: Tritanopia: Blue-Yellow Color Blindness What Causes Color Blindness?Ĭolor blindness occurs when light-sensitive cells in the retina fail to respond appropriately to variations in wavelengths of light that enable people to see an array of colors.
Sudden or gradual loss of color vision can indicate any number of underlying health problems, such as cataracts.Ĭolor blindness testing can help determine the kind of color deficiency you have. If you develop color vision problems when normally you have been able to see a full range of color, then you definitely should visit your doctor. Most people who are considered "color blind" can see colors, but certain colors appear washed out and are easily confused with other colors, depending on the type of color vision deficiency they have. If so, these are primary signs that you have a color vision deficiency.Ĭontrary to popular belief, it is rare for a color blind person to see only in shades of gray. What are the signs and symptoms of color blindness?ĭo you have difficulty telling if colors are blue and yellow, or red and green? Do other people sometimes inform you that the color you think you are seeing is wrong? This blue-yellow color deficiency usually affects men and women equally. Much more rarely, a person may inherit a trait that reduces the ability to see blue and yellow hues. Red-green color deficiency is the most common form of color blindness. According to Prevent Blindness, an estimated 8 percent of males and less than 1 percent of females have color vision problems. If you are colorblind, you have difficulty distinguishing certain colors, such as blue and yellow or red and green.Ĭolor blindness (or, more accurately, color vision deficiency) is an inherited condition that affects males more frequently than females. Color blindness is not a form of blindness at all, but a deficiency in the way you see color.
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