In people with blue eyes, those scattered pigment particles bounce blue light back out of the iris due to the Tyndall effect, and the iris absorbs the red light.

有着蓝色眼睛的人由于丁达尔效应，他们的色素粒子把虹膜里的蓝色光线弹开，并且虹膜吸收红色光线。