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90th meridian aberration addition adjustment alignment American Optical Company angle aphakic astigmatism back surface Balgrip base curve base-apex line Bausch & Lomb bevel blank bridge caliper cataract center thickness chart concave convex crown glass cutting cylinder axis cylinder form cylinder power decentration distance portion doctor drill edge thickness edger effective power endpiece example eyewear eyewires flint glass frames and mountings front surface fused bifocal geometric center grinding index of refraction inserted kryptok lens arms lens stop lenses lensometer light major lens manufacturers marked millimeters minus cylinder minus lens nose oblique ophthalmic optical center pads Panoptik plane plastic frames pliers position Power Formula power wheel prescribed prescription prism diopters prism power protractor pupillary distance rays reading level refractive index reticle rimless mountings rotation single vision spectacles sphere power spherical strap surface power target temple Tillyer tilt Trifocal Ultex Univis vertex vertical Vertometer wear