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 41
29.) and which, by a similar method of analysis to § 33, pursuant to § 32, willbe found to be asymmetrically-refracting equivalents. According to Kule 1, § 34, as an instance, the concave sphero-cylin-drical lens — 1.25 sph. ~ — 0.75 cyl. axis 160° may b? converted into the pcriscopic form — 2 sph.… … Fig. 27.Concave Cylindro-cylindrical Lens (— c* axis 180° c^ axis 90°). d> d2 ^,Ar:^^ «• el \ \ .L_. e ft Z^>^^i i ! .G Fig. 28.Concave Sphero-cylindrical Lens {— s^ ^ — d^ axis 90°)—Double Form.
Lenses · Prisms (Ophthalmology)
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