According to Bio-Medicine (2008) the eye environment is like a balance ecosystem where each component plays an important role. In this case tears play their own role and every time a person blinks, tears flow from a coating and nourish the eye surface by washing away foreign objects and preventing dryness.
When tear production is reduced, eyes will become dry, scratch and irritated. Dry eyes, also called keratoconjuctivitis sicca is eye disease which results from decreased production of tear. It can also be due to increased tear film evaporation and it is commonly found in old people.
The condition affects millions of people across the world with a high prevalence in females. For example studies in the united states of American have showed a ratio of 9:1 in women above 40 years. With increase prevalence of the condition, it is important to understand its causes and remedies and how one can prevent the disease.