Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 51
In Fig. 36 two plano-toric lenses L^ and L- are shown to have the sametoric surface as in Fig. 35. As the principal meridians in each of theselenses are convex and concave, we may write their formulas as follows: (CJ [— 3D. Eef. 90° Z + 3D. Eef. 180°] Tor (L^) (Di) [+ 3D. Eef. 90° C — 2D. Eef.…
Lenses
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