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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 45
..i-- « U-- Fis. 32. Concavo-convex Sphero-cylindrical Lens (—s^ O + ^* axis 180°). and cylindrical curvatures, according to § 32, the demanded positive andnegative elements of refraction for the principal meridians of the crossedcylindrical lens, Fig. 30, are fulfilled. 42 COMPOUND LENSES. To… … Fig. 30c. Fig. 31c. Fig. 32c. Formula Ic. — 1.5 cyl. axis 90° C + 3.5 cyl. axis 180°. (Fig. 30.) Refraction: ) , . . _^ Fio 30c r — horizontal .^ -\- 3.5 vertical = — 1.5H 3 + 3.5V. Formula lie -f 3.5 spherical C — 5 cyl. axis 90°. (Fig. 31.)FirtlT * 1 — 5 + 3.5 horizontal C + 3.5 vertical = — 1.5H…Lenses · Prisms (Ophthalmology)
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