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 139
1 meter = 100 centimeters. A IP. D. ! 1 D. Fig.]. upon a peripheral portion of the lens one centimeter from the opticalcenter (Fig. 1). The prism-dioptry therefore also represents the measure of the angle ofdeviation /„ for an eccentricity or decentration of one centimeter (Fig. 1). 1 meter = lOO-… … f 2 D. 3^ meter. Fig. 2. A ray impinging upon the same point of a 2-dioptry lens (Fig. 2) willsustain the same unit-deflection at its focus ^ meter, and will therefore findthe measure of its angle of deviation y,, expressed by twice the deflectionat the meter-plane, or 2 prism-dioptries. A lens…
Lenses · Prisms (Ophthalmology)
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