Question

why r tears saline? how r tears useful to eyes?

Answer 1

This salinity of tears along with the presence of enzymes like lysozyme is responsible for their antimicrobial activity. Basal tears have a salt content similar to blood plasma. The salinity of basal tears disturbs the osmotic balance of bacteria and keeps the cornea in a healthy microbial-free environment. The mineral content of tears also nourishes the tissues associated with eyes. Saline nature of tears also indicates our evolutionary descent from marine organisms.

When we blink, the tears lubricate, nourish and protect the front of the eye. … glands in our eyelids produce an oily component, while other cells produce a mucus. These mix together to create a film which covers the white of the eyeand the cornea. ... Wearing glasses or sunglasses can help to reduce tear evaporation.

Answer 2

Tears are produced by a special gland called the lacrimal glands or the tear gland. It is saline because there are some dissolved salt present in it. It's salinity property helps us by cleaning away the germs present in the eyes and keeps it clean and fresh.=========≠=====

======== Whether you're crying or your eyes are just tearing, the liquid in your eyes is created the same way.They are secreted by tear glands called lachrymal glands which are situated on the inner surface of the upper eyelids.Mainly, tears are composed of water, salts, antibodies and lysozymes so they are saline Tears nourish