如果睡觉时你对光敏感，挂上厚窗帘或用眼罩。
If you're sensitive to light while sleeping, get thick drapes to cover your Windows or use an eye cover.
该方法用到一片铜片，上面用光敏感的沥青覆盖。
The method involves a piece of copper covered with light sensitive bitumen.
几年前，科学家在眼睛里发现了另一种类型的光敏感细胞。
A few years ago, scientists discovered another type of light-sensitive cell in the eye.
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