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 113
refracting angle, and, in fact, from prisms of anyother system. The Dioptral f System | of numbering prisms alone possesses the greatdesideratum of establishing a direct and simple relation between the prism-dioptry and the lens-dioptry, as demonstrated by the authors law,|| that a lens decentered… … Fig. 1. Fig. 2. prism-dioptral power is also in direct proportion to the amount of decentra-tion, so that a lens of 2 D. decentered J cm. gives 1^ ; whereas, if the samelens is decentered 2 cm. it produces 4^, and so on. It is, therefore, onlythe size of the lens which in practice will set a limit…
Lenses · Prisms (Ophthalmology)
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