LASIK eye surgery changes the shape of your cornea—the transparent membrane that arcs over your pupil and the colored part of your eye (iris).

LASIK 眼科手术改变了你的角膜的形状——角膜是覆盖在你的瞳孔和你的眼睛的有色部分（虹膜）上的弧形透明膜。

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If you watch a cat blink, you will see a white membrane cross its eye - that is called its third eyelid.

当你看一直猫眨眼的时候，你会看到它眼睛上有一道白膜，这叫做第三眼睑。

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The protective bit at the front of the eye is the cornea and once light passes through this membrane, it passes through the iris.

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。

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The UCL team discovered that MIP-1a plays a key role in the early stages of an allergic response within the clear membrane that coats the inner surface of the eyelid and outer surface of the eye, known as the conjunctiva.

BBC: NEWS | Health | Eyelid protein is key to allergy