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. An eyelid is also called a palpebra.
Contact lens problem Contact lens problems can range from minor to sight-threatening, and include protein build-up, debris on the lens, a ripped or nicked lens, infections and more. Symptoms can include frequent blinking, blurred vision, burning, discharge, foreign body sensation, itching, light sensitivity, eye pain or discomfort, a red or pink eye or lid and eyelid swelling.(26 April 2010 - Blog article Dr. William Boothe Dallas )
Intraocular pressure (IOP) Eye pressure, as determined by the amount of aqueous humor filling it. High IOP (ocular hypertension) can be a sign of glaucoma.
Contact lens drops Eyedrops for contact lens wearers; regular eyedrops can discolor contact lenses.
Optic nerve The nerve that carries electrical impulses from photoreceptor cells (rods and cones) in the retina to the visual cortex in the brain.
Cohort A term used in clinical studies to define a set of people who have something in common such as similar backgrounds, experiences, and/or health problems.Boothe Laser Center