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Start Over Subjects Eyeglasses ✖Remove constraint Subjects: Eyeglasses Titles A treatise on simple and compound ophthalmic lenses: their refraction and dioptric formulae, including tables of crossed cylinders and their sphero-cylindrical equivalents ✖Remove constraint Titles: A treatise on simple and compound ophthalmic lenses: their refraction and dioptric formulae, including tables of crossed cylinders and their sphero-cylindrical equivalents Dates by Range 1850-1899 ✖Remove constraint Dates by Range: 1850-1899

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  • A treatise on simple and compound ophthalmic lenses: their refraction and dioptric formulae, including tables of crossed cylinders and their sphero-cylindrical equivalents1