In the U.S., there were 24.4 million cases of cataracts in 2010, and the number is expected to double to 50 million by 2050, according to the National Eye Institute.
What is a cataract?
A cataract is a clouding of the crystalline lens inside the eye which leads to a decline in vision. Aging is the most common reason for a cataract, but other factors include disease, trauma, and certain medications. Most cataracts grow slowly over decades, but some may progress more quickly.
The crystalline lens is the structure located in the middle of the eye, in front of the retina, but behind the iris (colored part). All light that enters the eye goes through the cornea and the lens to get to the retina. If a cataract is affecting the lens, distorted vision is the result. Glasses and contacts are unable to correct the vision until the cataract is removed.