CLEAR LENS EXTRACTION (CLE) - Procedure in which the eye’s natural clear crystalline lens is removed and replaced with an intraocular lens implant, using the same technique as cataract surgery CONTACT LENS - Small, thin removable plastic lens worn directly on the front of the eyeballs, usually used instead of ordinary eyeglasses for correction or protection of vision CORNEA - Transparent tissue that forms the front part of the eyeball, covering the iris and pupil. The cornea is the first part of the eye that bends (or refracts) the light and provides most of the focusing power. CORNEAL CURVATURE - Shape of the front of the eye CORNEAL MAPPING, TOPOGRAPHY - A tool used to see the refractive problems that might be present in the cornea. Corneal topography is used not only for screening all patients before refractive surgery like LASIK but also for fitting contacts. CRYSTALLINE LENS - Double convex, transparent part of the eye, located behind the iris and in front of the vitreous body. Serves in conjunction with the cornea to refract incoming rays of light onto the retina DIABETIC RETINOPATHY - Deterioration of retinal blood vessels in diabetic patients, possibly leading to vision loss DILATION - Enlargement of the pupil (space in the middle of the iris) DRY EYE - A common condition that occurs when the eyes do not produce enough tears to keep the eye moist and comfortable ENDOTHELIUM - Cellular tissue that covers the inner surface of the eye within the closed cavity, typically referring to the cornea ENHANCEMENT - An additional LASIK procedure, used in the refinement of Personal Best Vision EPITHELIUM - Cellular tissue that covers the outer surface of the eye. Consists of one or several layers of cells with little intercellular material