CL101 Study Guide - Midterm Guide: Allergic Conjunctivitis, Optical Power, Desiccation
Document Summary
Contact lens theory 2 - terms and key phrases. B. c. o. r. (back central optic radius): radius of curvature of the central, optic zone of a contact lens. Back optic zone: back area of the lens which carries the optical power. Back toric lens: a lens design that has a spherical front surface and a back toric surface. Typically used when the corneal cylinder exceeds 3. 00 d and the amount of corneal versus spectacle cylinder are relatively equal. Bandage lens: soft contact lens with no refractive power, used for protecting damaged or irregular corneal surfaces. Bi-toric lens: contact lens that has non-spheric cylindrical (toric) curvatures on both front (for astigmatic correction) and back (for stabilizing lens position and alignment on a highly astigmatic corneal surface). Desiccation: is the state of extreme dryness, or the process of extreme drying. Front optic zone: front area of the lens which carries the optical power.
