NCLE Pre-Test 2024.

NCLE Pre-Test 2024. annular bifocal contact - ANSWER A lens with distance portion ground into the center of the lens and the near portion ground into the periphery aphakic lenses - ANSWER lenses designed for post-cataract fitting apical zone of cornea - ANSWER the central portion of the cornea with a constant radius of curvature. Also called the corneal cap. artificial tears - ANSWER medications, many of them over the counter, to treat dry eyes aspheric lens - ANSWER A non-spherical lens, in which the radii of curvature increase towards the periphery rather than remaining equal at all points. Aspheric lenses reduce optical aberration and improve resolution. bactericide - ANSWER a chemical that disinfects and kills pathogenic organisms. benzalkonium chloride - ANSWER a preservative used in contact lens solutions because of its germicidal qualities biomicroscopy - ANSWER Ophthalmic examination of the eye by use of a slit lamp and a magnifying lens; also known as a slit-lamp exam. 10 to 50 times magnification bullous keratopathy - ANSWER corneal edema with painful blisters in the epithelium due to corneal endothelial dysfunction. treated frequently with a therapeutic soft lens. Burton lamp - ANSWER an ultraviolet light used to illuminate the fluorescein dye that is used to analyze the fit of a rigid contact lens. chord length - ANSWER the straight-line measurement of the contact. lens diameter from edge to edge. circumcorneal injection - ANSWER Redness around the limbus surrounding the cornea contact lens wetting angle - ANSWER the angle between the liquid and the lens surface. contour lens - ANSWER a tricurve lens designed to conform to the curvature of the cornea, which flattens as it extends in the periphery. copolymer - ANSWER two or more chemicals that are combined to form a new chemical compound.