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 49
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: (Ci) [— 3D. Eel 90° C + 2D. Kef. 180°] Tor {U) (Di) [+ 3D. Kef. 90° C — 3D. Kef. 180°]…
Lenses · Prisms (Ophthalmology)
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
