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A cataract is clouding of the lens inside of the eye to an extent that affects vision. The lens is the clear part of the eye located behind the pupil, which is used to focus light upon the retina. In a healthy human eye, light passes through this transparent lens to reach the retina, which then changes this light into nerve signals sent to the brain. For the retina to receive and translate light or an image, the lens must be clear. If the lens is cloudy due to a cataract, the image received in the brain will be blurred.
Most cataracts are...