Tears - Wikipedia Tears are a clear liquid secreted by the lacrimal glands (tear gland) found in the eyes of all land mammals [1] Tears are made up of water, electrolytes, proteins, lipids, and mucins that form layers on the surface of eyes [2] The different types of tears—basal, reflex, and emotional—vary significantly in composition [2]
Facts About Tears - American Academy of Ophthalmology Tears are essential to help you see clearly and maintain the health of your eyes They can also help communicate your emotions Your body makes three types of tears Basal tears are in your eyes all the time to lubricate, nourish and protect your cornea
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
The Composition of Tears and Their Role in Eye Health Tears are made of mucus, water, and oil, and each component plays a role in the eye Mucus coats the surface of the eye and helps bind the tear layer to the eye Without a healthy mucus layer, dry spots may form on the cornea, the clear, dome-like structure on the front of the eye
Tears | Dry Eye | MedlinePlus Your tears clean your eyes and keep them moist Read about tears and what can go wrong, like too many tears, too few tears, or tear duct problems