What Is the Tear Film?

Tear film: Tear is evenly distributed in the conjunctival sac, forming a thin film of liquid, which is medically called a tear film.

Tear film

What is the tear film?

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When the upper and lower eyelids are closed, the tear film gradually thickens. When the upper and lower eyelids are closed to 2 mm, the tear film forms an elongated "concave-convex cylinder". It can become clearer when looking through . We often see that when someone has myopia or astigmatism, they often squint to see something, which is related to this. In addition, the tear film provides essential nutrients to the cornea.