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Ophthalmic nurses examine and advise patients. They administer tests for visual acuity and do slit lamp examinations, test blood pressure and urine, and may make preliminary diagnoses and assist ophthalmologists in surgery. In many countries, the role of the ophthalmic nurse is expanding and they are now taking on a lot of the tasks formerly only performed by ophthalmologists. Now ophthalmic nurses treat cataracts with surgery known as laser capsulotomy, excise cysts in the eyelid, and do other minor surgical procedures.