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180th meridian American 0ptical American Optical Aphakia astigmatism axis B.F. toric form back surface base curve Bausch & Lomb Calculate center thickness Check concave convex corneal vertex Courtesy cross cylinder form crown glass cyl form cylindrical lenses decentration degree of prism diagram diameter direction effective power Flint focal length following Rx frames Front or Toric front surface Ful-Vue fused bifocal Given grinding hyperopia inches index of refraction lens blank lens containing lens measure lens thickness lensometer meniscus meter millimeters minimum edge thickness minus cylinder form minus lens Minus Surface motion myopia neutralizing chart Numont optical center optical glass parallel rays plano polished power wheel Presbyopia prescription principal meridians prism B. I. prism diopter prismatic effects prismatic power pupillary distance rays of light refraction is 1.500 refractionist refractive error side sphere spherical lenses temple Thick Edge Transpose into B.F. unknown lens x i x