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By Mayo Clinic staffIf you can't close your eye, you'll need to keep the eye moist with hourly eyedrops during the day and an eye ointment at night. If the clear protective covering of the eye — called the cornea — becomes too dry, it can cause permanent vision loss. Your doctor may want you to wear glasses or goggles during the day and an eye patch at night to protect your eye from getting poked or scratched.