Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1907)
Prentice, Charles F. (Charles Frederick), b. 1854 · Philadelphia : Keystone · leaf 49
the process of grinding mustbe resorted to; although this at present involves more complicated ap-paratus. A lens having one surface spherical and the other toric is called■& sphero-toric lens. Its advantages are explained in a subsequent paper. § 44. A toric surface with contra-generic…
Lenses · Prisms (Ophthalmology)
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
