Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 51
ble, the process of grinding mustbo resorted to; although this at present involves more complicated ap-paratus. A lens having one surface spherical and the other toric is calleda sphero-toric lens. Its advantages arc explained in a subsequent paper. § 44. A toric surface with contra-generic…
Lenses
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