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absorb amount aniseikonia anisometropia astigmatism axis barium crown glass base curves Bausch & Lomb bifocal lenses blanks Cataract Bifocal cataract lens cemented chromatic aberration color concave contact glass contact lens convex lens cornea crown glass cylinder degrees diameter diopter Disc Cataract dispersion distance and reading distance field distance lens distance portion distance vision edge flint glass flint segment focal length grinding ground horizontal imbalance indicator line infra red Kryptok light magnification melt ment meridian millimeters minus Myo-Disc Nokrome ocular image ophthalmic lenses optical center Optical Company optical glass optician ordinary Orthogon oxide patient plane plano prescription prism prism base prismatic effect produced rays reading addition reading field reading portion reading segment reading vision refractive index Softlite spherical surface telescopic spectacle thickness tion toric trifocal ultra violet Univis vertex distance vertex refraction vertical visible spectrum visual acuity visual points wave lengths Widesite Zeiss