A nuclear cataract is the most common type of cataract. Nuclear cataracts begin with a gradual hardening and yellowing of the center of lens, called the nucleus. This hardening gradually expands to the other layers of the lens. The cataract causes light to scatter when it passes through the lens, which decreases the amount of light to the retina. If left untreated, these symptoms will increase in severity, eventually leading to major vision loss that can only be restored through surgery.
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