Iris Pigmentation

Health

A true black eye is usually the result of trauma that causes bleeding beneath the thin skin around the eye, creating a dark purple or black bruise. This is different from eye co...

Health

Black-looking pupils are common and usually normal, but many people wonder whether the eye itself is completely black and what creates that appearance. The pupil is a small open...

Health

Eye color is primarily set by genetics, specifically by multiple genes that control melanin production and placement in the iris. Melanin is a brown pigment; higher amounts and...

general

Eye color is a polygenic trait shaped by multiple genes and levels of melanin in the iris. Medically and statistically, hazel eyes are widely regarded as the third rarest global...

science-eye-color

Hazel eye color is a mix of brown, green, and sometimes gold tones in the iris, often appearing to shift in different light. It is most common in people of European ancestry, es...

Health

Heterochromia is a variation in iris color that produces two noticeably different colored areas in one or both eyes. It can be complete, when each iris is a fully different colo...

conditions

Heterochromia is the condition in which the irises of the eyes are different colors. It can be complete, with each iris a distinct color, or partial, when only part of one iris...

health-and-science

Do people have purple eyes? In everyday conditions, no one has naturally purple irises; what looks purple is usually a mix of deep blue and red tones shaped by lighting, skin, a...

healthcare

Heterochromia iridum is a relatively uncommon ocular condition in which there is a visible difference in coloration between the two irides. Clinical classification distinguishes...

Health & Wellness

Two different eye colors, medically called heterochromia, occurs when the iris pigmentation or neurological pathways differ between eyes. It can be complete, sectoral, or centra...