The color of the eyes of an individual is dependent on the color of iris which is actually the result of the amount or density of pigment cells in the iris. Pigment cells which are as well called melanocytes, produce the pigment that is known as melanin. The amount and density of the melanin determines what colors of light are absorbed and what is reflected. Essentially speaking, the higher the concentration of melanin in the iris, the darker the iris color. However, the color of the iris does not affect visual acuity or the sharpness of a person's vision. On the other hand, researches have found out that those people who have blue or light-green eyes may be more sensitive or experience more visual discomfort in bright sunny conditions than whose people who have brown-colored eyes. The reason that cause this kind of distinction is that the higher concentration of melanocytes in the darker iris acts as a internal-sun shade of sorts while the light-colored eyes cannot, which as well explain how light colored irises may be easier to get higher risks for certain eye problems because more harmful UV light will pass through the iris and increase risks for cataracts and macular degeneration. Therefore, wearing sunglasses with UV-blocking lenses can reduce these risk factors and help all eyes stay healthy over the long haul.
