Eye colour

Close up of a human iris
Brown eye, pupil dilated
Close up image of a mantis' face (Archimantis latistyla) showing its camouflaged eyes

Eye color is a visible character caused by two factors: the pigmentation of the eye's iris,[1][2] and way light is scattered as it hits the top layer of the iris.[3]

Physical cause

In humans, the pigment of the iris varies from light brown to black. This depends on the amount of melanin in the iris.[4] The appearance of blue, green and hazel eyes result from the Rayleigh scattering of light in the iris. A similar process accounts for the blueness of the sky. Neither blue nor green pigments are ever present in the human iris or fluid.[3][5] Eye colour is an example of structural colour which varies according to the lighting conditions, especially for lighter-coloured eyes.

The brightly coloured eyes of many birds, reptiles and insects is caused by other pigments, such as pteridines, purines, and carotenoids.[6]

Other Languages
العربية: لون العين
تۆرکجه: گؤز بویاغی
bosanski: Boja očiju
dansk: Øjenfarve
Deutsch: Augenfarbe
English: Eye color
español: Color de ojos
Esperanto: Okula koloro
euskara: Begi kolore
فارسی: رنگ چشم
français: Couleur des yeux
한국어: 눈 색깔
hrvatski: Boja očiju
latviešu: Acu krāsa
magyar: Szemszín
Nederlands: Oogkleur
norsk: Øyenfarge
norsk nynorsk: Augefarge
polski: Kolor oczu
português: Cor dos olhos
русский: Цвет глаз
srpskohrvatski / српскохрватски: Boja očiju
தமிழ்: கண் நிறம்
Türkçe: Göz rengi
українська: Колір очей
Tiếng Việt: Màu mắt
中文: 眼睛色彩