Presbyopia :
The term presbyopia refers to a condition where the eye loses its ability to change the focus, thus leading to loss of clear close-up vision. The major presenting complaints of presbyopia are the need for more light when the person is reading, blurred vision at a normal reading distance, the need to hold reading material at arm's length, headaches from doing close work, and eye strain, which makes the eye feel sore or tired. Presbyopia occurs due to aging, which causes the eye's natural lens to lose its flexibility slowly. There is an increased risk of presbyopia in people who are older than forty years of age, with farsightedness, suffering from certain conditions like diabetes, multiple sclerosis, or cardiovascular and those who take certain medications like antihistamines and antidepressants. This refractive error is corrected by wearing eyeglasses, contact lenses, surgery and eye drops.