Iris (anatomy)

Light micrograph of the iris near to the pupil. M. sph. sphincter muscle, L lens

Among human phenotypes, blue-green-gray eyes are a relatively rare eye color and the exact color is often perceived to vary according to its surroundings.

The iris (plural: irides or irises) is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina. Eye color is defined by that of the iris. In optical terms, pupil is the eye's aperture, while iris is the diaphragm that serves as the aperture stop.

单词	Crypts of Fuchs
释义	Crypts of Fuchs 英语百科 Iris (anatomy) The iris (plural: irides or irises) is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina. Eye color is defined by that of the iris. In optical terms, pupil is the eye's aperture, while iris is the diaphragm that serves as the aperture stop.
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Crypts of Fuchs

Iris (anatomy)