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10D lens 9 base blank 9 base toric American Optical Company axis back focal length back focus bifocal center of rotation center thickness cornea corneal distance curvature cylinder definition of effective designed diopters distant source E. D. Tillyer effect of thickness equation equivalent power error focal point Focal Power front curve front surface power give Glancy glass index of refraction last surface Laurance lens measure Lensometer manufacture Marked True Marked measured in meters Menis meniscus meridian negative lenses neutralizing power numbers Oblique power oblique vision OOOOOOOOOOO Ophthalmic Lenses ophthalmic optics Phoroptor piano positive lenses power and neutralizing Power of Ophthalmic Power Power Power primary focus principal planes principal point rear surface refracting instrument secondary focus semi-finished blank shape spectacle lens sphere succession of lenses theoretical thin lens trial frame trial lens trial set True Marked True true power vergency vertex refraction worn