泪膜

English: Tear Film

中文： 覆盖眼表的薄层液体，含脂质、水液与黏液层，起润滑、光学与保护作用。局部泪膜不稳定时，眨眼或转动眼球可短暂暴露并刺激角膜神经，引起一过性刺痛。

English: Thin layered fluid over the ocular surface (lipid, aqueous, mucin) that lubricates and protects the cornea. Local breakup can briefly expose corneal nerves and trigger a sharp twinge.

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