6 Rare and Unique Eye Colors - Owlcation
We also know that eye color determination involves two pigments: melanin (brown pigment) and lipochrome (yellow pigment). It also depends on how the iris scatters light. Light blue eyes indicate an absence of melanin or brown pigmentation. Conversely, when you see someone with dark brown eyes, they have an abundance of melanin.
Central Heterochromia: Definition and Causes - All About Vision
2020年9月8日 · Central heterochromia is when the inner ring of the iris — the eye color closest to your pupil — is a different color than the outer ring, along the edge of your iris. This trait usually involves both eyes, with two separate colors appearing in each eye instead of one.
Heterochromia iridum - Wikipedia
The blue eye occurs within a white spot, where melanin is absent from the skin and hair (see Leucism). These species include the cat, particularly breeds such as Turkish Van, Khao Manee and (rarely) Japanese Bobtail. These so-called odd-eyed cats are white
Central Heterochromia: Definition, Causes, and Types - Healthline
2024年7月1日 · Some people are born with two colors in the same eye, or central heterochromia, due to a genetic mutation affecting melanin production. Others can develop it due to an injury or health condition....
Central Heterochromia (2 Eye Colors): Causes & Treatments
2024年9月24日 · Central heterochromia is when one eye contains multiple pigments. It can cause a color abnormality that stems from the pupil at the center of the eyes, like cat eyes. An uneven distribution of melanin in your iris can cause this condition. The outer ring will almost always be blue or green.
Uncovering The Mystery Of Blue Eyes With A Yellow Ring
2023年9月7日 · If you’re short on time, here’s a quick answer to your question: The presence of a yellow ring around blue irises is usually benign and caused by natural changes in pigmentation as people age. It does not generally indicate any eye health issues. In this comprehensive guide, we will get to the bottom of the yellow ring around blue eyes mystery.
Eye color - Wikipedia
Unlike brown eyes, blue eyes have low concentrations of melanin in the stroma of the iris, which lies in front of the dark epithelium. Longer wavelengths of light tend to be absorbed by the dark underlying epithelium, while shorter wavelengths are reflected and undergo Rayleigh scattering in the turbid medium of the stroma. [ 4 ]
Heterochromia: Causes, Types, Risk Factors, and Treatment - WebMD
2023年10月26日 · A person with differently colored eyes or eyes that are more than one color has heterochromia. Learn more about the symptoms, types, risk factors, causes, diagnosis, and treatment.
Tritanopia: Seeing Blue and Yellow Differently - Vision Center
2024年2月21日 · Tritanopia is a rare type of color blindness that alters how you see the colors blue and yellow. It is caused by the absence of S cone cells (short wavelength) in the retina and is typically the result of a gene mutation.
Odd-eyed cat - Wikipedia
An odd-eyed cat has one blue eye and one eye either green, yellow, amber, or brown. This is a feline form of complete heterochromia, [1][2] a condition that occurs in some other animals, including humans. There is also sectoral (partial) heterochromia, where two different colours occur within the same iris.