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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
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. … Fig. 29.Ooncavs Sphero-cylindrical Lens (— s^ O + c^ axis 180°) — Periacopic Form. In the above figures, i, e, and/ are associated with horizontal, and i», c*, and/* with vertical refraction. COMPOUND LENSES. 3. CONTRA-GBNERIC MERIDIANS (CONVEX AND CONCAVE). § 37. Hitherto we have considered…Lenses · Prisms (Ophthalmology)
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