A treatise on simple and compound ophthalmic lenses : their refraction and dioptric formulae, including tables of crossed cylinders and their sphero-cylindrical equivalents / by Chas. F. Prentice.

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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 equivalents / by Chas. F. Prentice. Public Domain Mark. Source: Wellcome Collection.