Ophthalmic Mechanics for the Refractionist, Volume 1Southern College of Optometry, 1948 - Eyeglasses |
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Page 147
George Joseph Haus. ( c ) The lens thickness at the thin edge ( d ) The lens thickness at the geometrical center ( G.C. ) Note : The geometrical center is that point on a lens surface which is equidistant from all edges . Also note that ...
George Joseph Haus. ( c ) The lens thickness at the thin edge ( d ) The lens thickness at the geometrical center ( G.C. ) Note : The geometrical center is that point on a lens surface which is equidistant from all edges . Also note that ...
Page 150
... thickness if the center thickness ( at the O.C. ) is 4 points . Find the sag and the edge thickness . XIII . Given : A plus 3.00 D. lens with a diameter of 38 mm . and an edge thick- ness of 4 points . Calculate the sag and the center ...
... thickness if the center thickness ( at the O.C. ) is 4 points . Find the sag and the edge thickness . XIII . Given : A plus 3.00 D. lens with a diameter of 38 mm . and an edge thick- ness of 4 points . Calculate the sag and the center ...
Page 151
... thickness is 4 points . The blank is decentered 3 mm . and a lens 38 mm . round is cut from the blank . Find : ( a ) The lens thickness at the 0. C. ( b ) The lens thickness at the G. C. ( c ) The lens thickness at the Thick Edge . ( d ) ...
... thickness is 4 points . The blank is decentered 3 mm . and a lens 38 mm . round is cut from the blank . Find : ( a ) The lens thickness at the 0. C. ( b ) The lens thickness at the G. C. ( c ) The lens thickness at the Thick Edge . ( d ) ...
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Common terms and phrases
180th meridian American Optical amount of prismatic Aphakia astigmatism axis B.F. toric form Back or Minus back surface base curve Bausch & Lomb Calculate centimeters concave convex cross cylinder form crown glass cyl form cylindrical lenses D₁ D₂ decentration degree of prism deviation diagram direction distance P.D. effective power flat form Flint focal length following Rx frames Front or Toric front surface FUL-VUE fused bifocal Given grinding hyperopia hyperopic inches index of refraction lens measure lens thickness lensometer meniscus meter millimeters minimum edge thickness minus cylinder form minus lens Minus Surface motion myopia Numont optical center optical glass parallel rays plano power wheel Presbyopia prescription principal meridians prism diopter prismatic effects prismatic power pupillary distance rays of light refractionist refractive error refractive power S.V. toric side sphere spherical lenses Surface Fig temple thru the lens Toric Surface Transpose into B.F. unknown lens wave front