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 42
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… … Fig. 30.Concavo-convex Cylindro-cylindrical Lens {— c axis 90° :i^ -[- c^ axis 180°). sections. In contradistinction thereto, and as a final complication, wemay combine in a lens different or even like degrees of refraction, thoughof opposite type; namely, convex in one and concave in the other…
Lenses · Prisms (Ophthalmology)
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