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Grey eyes make up about 3 percent of the world's population—the second rarest eye color. There are also rare cases of violet and red-colored eyes. What Determines Eye Color?
With most eye colors, the amount of melanin is consistent across the entire iris—the more melanin, the darker the eye will appear. With hazel eyes, however, varying amounts of melanin exist in ...
In humans, eye color is a highly sexually dimorphic trait. [18] Several studies have shown that men are more likely to have blue eyes than women, while women are more likely to have darker eye colors (green and brown eyes) than men. [18] [19] Sex is therefore a major factor in the expression of eye color genotypes. [18]
This is a list of notable people who have been documented as having heterochromia iridis, a condition when the irises have different colours. People who are frequently mistakenly thought to have heterochromia are not included, but may be listed in the Notes section.
Waardenburg syndrome is a group of rare genetic conditions characterised by at least some degree of congenital hearing loss and pigmentation deficiencies, which can include bright blue eyes (or one blue eye and one brown eye), a white forelock or patches of light skin.
Coloboma is a rare eye condition, experienced by Madeleine McCann, that can impact vision. ... "many people with a coloboma—if it’s just in the iris—are capable of 20/20 vision," Dr. Donahue ...
Central heterochromia is also an eye condition where there are two colors in the same iris; but the arrangement is concentric, rather than sectoral. The central (pupillary) zone of the iris is a different color than the mid-peripheral (ciliary) zone. Central heterochromia is more noticeable in irises containing low amounts of melanin. [32]
To test how someone’s eye color could determine their attractiveness, the research team recruited 300 heterosexual and homosexual men and women. Each participant’s eye color, as well as those ...