Cataracts occur with the clouding of the natural the lens of the eye, causing vision to become blurry and interfering with performing daily activities comfortably. This occurs as a person grows older, though in some cases cataracts can occur at any age due to pre-existing conditions. As you age, the lens loses flexibility, and at around age 40 reading glasses become necessary to correct near vision. Eventually the lens becomes cloudy (i.e. a cataract) and hence the vision gets more blurred. When this causes a significant impairment, cataract surgery can be performed to restore clarity of vision.
About Cataract Surgery
Cataracts are usually surgically removed using a procedure called phaco-emulsification. In this procedure, a small incision is made in the eye, then an ultrasonic instrument uses sound waves to break up the lens, and the fragments are removed from the eye. An intraocular lens (IOL) is placed in the now empty lens capsule. Patients can usually return to their daily routine within a few days of their cataract surgery.