With aging, the eye's lens experiences a chemical change that makes it less transparent and may cause cloudy vision. This cloudy obstruction of the lens is called a cataract. Having cataracts is a common vision problem with over 70 percent of people developing cataracts by age 75.
The good news is that the clouded lens (cataract) can be replaced with a prescription lens to correct vision, possibly eliminating the need for eyeglasses completely, with a common surgical procedure. In fact, today cataract surgery is the most common surgery in the world.