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Most cases of heterochromia are the result of genetics, though sometimes, trauma or injury to the eye can disrupt the normal development of melanin in the iris—leading to changes in eye color.
The irises of human eyes exhibit a wide spectrum of colours. Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye's iris [1] [2] and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris.
Eye color, specifically the color of the irises, is determined primarily by the concentration and distribution of melanin. Although the processes determining eye color are not fully understood, it is known that inherited eye color is determined by multiple genes. Environmental or acquired factors can alter these inherited traits. [7]
Cyanopsia is characterized by a persistent blue tint to the vision, which is the most noticeable symptom. This change in color perception may affect the entire visual field or be more prominent in specific areas. The condition primarily involves the retina, the light-sensitive tissue at the back of the eye, and occasionally the optic nerve ...
The most unique part about hazel eyes is the blend of colors. Typically, we're used to seeing blue or brown eyes—eyes that are all one color. Hazel eyes spice it up with their mix of hues and ...
Read moreThis is the rarest hair and eye color combination. Brown eyes, hazel eyes, green eyes, blue eyes — these are the standard shades for the windows to our soul. But which hair color most ...
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.
The human eye's red-to-green and blue-to-yellow values of each one-wavelength visible color [citation needed] Human color sensation is defined by the sensitivity curves (shown here normalized) of the three kinds of cone cells: respectively the short-, medium- and long-wavelength types.