How Tears Work National Eye Institute

Tears keep your eyes wet and smooth, and they help focus light so you can see clearly. They also protect your eyes from infections and irritating things, like dirt and dust. Find out what tears are made of and how they protect your eyes.

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How the Eyes Work National Eye Institute

How Do Tears Work? Dry Eye Institute of St. Louis

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Parts of the Eye National Eye Institute

Dry Eye Syndrome

Characterization of tear production in subjects with dry eye

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