The eye is a vital organ that converts the reflected light from an object into neuron signals and feed them to the brain for processing and identification of the object.

The eyes can suffer from various conditions such as myopia, hyperopia, conjunctivitis, cataract, astigmatism, glaucoma, sty, infection and tumors. The eyelids blink several times a minute to clean the eyes and keep them moist, using the secretion of tears from the lacrimal gland. The lids also have a fast reflex action to protect the eyes.

Tears serve an important function in the health of the eyes. They wash off dust, chemicals, germs and other foreign bodies. They control the microorganisms in the eyes with their enzymes. In a condition called