A patient undergoing a phacoemulsification procedure to correct a cataract. It is the most common type of cataract removal. It works on the basis of administering ultrasound to emulsify the lens nucleus. A cataract is an opacity in the lens within the eye, caused by changes in the properties of the proteins that make up the lens. These proteins are known as crystallins, and are usually transparent but changes to their structure result in a loss of transparency.
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