Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 34
seen through them will appear to be enlarged by con-vex and diminished by concave lenses, when these are held at some distancefrom the eye. COMPOUND LENSES. I. CONGENERIC MERIDIANS (CONVEX). § 25. Au asymmetrically-refracting or astigmatic lens is one in whichthe principal diametrically-opposed… … Fig, 24.Convex Cylindro-cylindrical Lens (+ d axis 180° o + c^ axis 90°). Referring to § 21, Fig. 21, it is evident that the aberrative distanceF^ to F^ may aLso be definitely increased by giving different amounts ofrefraction to the active planes or sections of the combined cylinders. Inthis event…
Lenses
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