A cataract is a clouding of the lens of the eye that can impair vision. More than half of all Americans over the age of 65 have cataracts.

What Causes Cataracts?

The eye functions much like a camera. Light rays enter the eye, passing through the cornea, the aqueous humor (transparent fluid in the front of the eye) and then the pupil into the lens. The crystalline lens bends light rays to focus objects on the retina in the back of the eye. From there, the focused light hits the retinal receptors (rods and cones) and sends the light impulses through the optic nerve to the brain, which processes the images.

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