NCLE questions with correct answers

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