They can only see shades of dark and light. If a person's eye has no cone cells, then they cannot see any color at all.There are several different problems that can cause color blindness. Some types of color blindness, but not inherited color blindness, can be cured. That way it is possible that only a part of the visual field is affected by color blindness, but in the rest, there is no color blindness. Inherited forms of color blindness affect the retina only. These types of color blindness usually happen because of an accident. Color blindness can therefore also result if these areas of the brain, the optic nerve or the retina have been damaged. Parts of the thalamus and the visual cortex in the brain are involved in seeing, also seeing colors. Each color is "seen" as a result of how much each of the receptors is stimulated. These wavelengths cover much of the visible light. The third is sensitive to long wavelengths. Another is sensitive to medium wavelengths. One is specially sensitive to short wavelengths. Each type has a different pigment and reacts to a different spectrum of light. There are three different types of cone cells.
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