Cataracts occur when changes in the lens of the eye cause it to become less transparent. The lens is the crystalline structure that sits just behind your pupil, which is the black circle in the center of your eye.When light enters your eye, it passes through the transparent layer of tissue at the front of the eye (the cornea) and the lens, which focuses it on the light-sensitive layer of cells at the back of your eye (the retina).
Cataracts sometimes start to develop in a person's lens as they get older (age-related cataracts), stopping some of the light reaching the retina. This can affect your vision, making it become increasingly cloudy, blurry, or misty.
Cataract surgery is a relatively straightforward procedure that usually takes 30 to 45 minutes. It's often carried out as day surgery under local anesthetic, which means you'll be awake during the procedure and can go home on the same day.
During the operation, the surgeon will make a tiny cut (incision) in your eye so they can remove the affected lens. After it's been removed, a small plastic lens called an intraocular implant or intraocular lens will be inserted.
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