During the first months of life, an infants eyes may look more blue-grey and then get darker as eye pigment develops. These lenses should be worn with the same care as non colored contact lenses. Most people will have the same unique eye color from the time theyre learning to walk until theyre seniors. Many people opt to change or vary their eye color with colored contact lenses. Society has given eye color a lot of emphasis when it comes to appearance and beauty. The genetics, classification and ethnic origins of eye color is a fascinating science. This too can be related to trauma, medications, or a systemic medical condition. Heterochromia is a condition where there is a difference in iris color between two eyes. Yellowing can be associated with jaundice. Some conditions such as melanosis can be benign. The white part of the eye called the conjunctiva and sclera can change color. Eye color can also alert an ophthalmologist to certain medical conditions. People with lighter iris color have a higher prevalence of age-related macular degeneration. There are some medical implications of iris color. Gray eyes are common in Europe, the Middle East, Afghanistan, and Pakistan. Green eyes are common in Central Europe, Iraq, Iran and Turkey.
About 16 percent of the total world population has blue eyes.īrown eyes are more common in Asia and Europe. Studies have shown that the prevalence of blue eyes in the United States to be approximately 33 percent among Caucasians. Brown eyes have a large concentration of pigment. Blue eyes have a low concentration of pigment in the iris stroma.
Interestingly, in blue eyes there is no blue pigment. The color is determined by the concentration of melanin. There is often a mixture of colors from different pigments. Eye color can also be classified by light eyes, mixed eyes, and dark eyes. The colors include amber, blue, brown, gray, green, hazel, red, and violet. There is a very large spectrum of eye color. Eye color can also change during puberty, pregnancy, and after eye trauma. Most eye color changes happen in the first year of life. When a child is born, melanocytes slowly begin to produce melanin. The two main genes are located on Chromosome 15. There could be up to 16 different genes involved in human eye color. Eye color is determined by two distinct factors: pigmentation of the iris and the scattering of light in the stroma of the iris.Įye color is an inherited polygenic trait influenced by many genes. What Determines Your Eye Color? Knowledge Base, April 8, 2016
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