在眼睛最外层起保护作用的薄膜是角膜。光线通过这层薄膜后，就进入了虹膜。
The protective bit at the front of the eye is the cornea and once light passes through this membrane, it passes through the iris.
激光能去除眼球虹膜最外层的棕色素或黑色素，而蓝眼珠会在两到三周之后显现。
The laser energy removes the brown pigment, or melanin, from the top layer of the iris, and the blue eye colour emerges over the following two to three weeks.
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