Eye Diseases and Conditions Slideshow Pictures Pink Eye Slideshow Pictures Laser Eye Surgery Pictures Eyelid: The lid or cover of the eye, a movable fold of skin and muscle that can be closed over the eyeball or opened at will. Each eye has an upper and a lower lid. Also known as a palpebra. From Eye Health Resources How's Your Eye Health?Diabetes and Your EyesEye Care for Diabetes Featured Centers When Prostate Cancer SpreadsEssential Tips to Manage DiabetesWhat Is Cystic Fibrosis? What Causes It? Health Solutions From Our Sponsors Kept Your Wisdom Teeth? Therapy at Home?