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单词 Iris diseases
释义

Iris diseases

中文百科

虹膜 Iris (anatomy)

(重定向自Iris diseases)
双色虹膜与中央的黑色瞳孔

虹膜又称黄仁,眼睛构造的一部分,虹膜中心有一圆形开口,称为瞳孔,犹如相机当中可调整大小的光圈,内含色素决定眼睛的颜色。日间光线较为强烈时,虹膜会收缩,只使一小束光线穿透瞳孔,进入眼睛;当进入黑暗环境中,虹膜就会往后退缩,使瞳孔变大,让更多的光线进入眼睛,多数的脊椎动物的眼睛都有虹膜。因为每个人的虹膜都是不同的,所以也用于身份标识。

英语百科

Iris (anatomy) 虹膜

(重定向自Iris diseases)
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.

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更新时间:2025/6/20 16:41:34