The clinical use of prisms; and the decentering of lenses (1893)
Maddox, Ernest Edmund, 1860-1933 · Bristol : J. Wright ; London : Simpkin, Marshall, Hamilton, Kent · leaf 81
6 Chapter IX. ADJUSTMENT OF PRISMS IN THETRIAL-FRAME. If the apex and base of a circular prism arecorrectly marked, there is no difficulty in setting itwith the base-apex line either exactly vertical orhorizontal. But if there should be any doubt abouttheir precise position, the following simple… … Fig. 36.—Two prisms in a trial-frame. eyes, so that, as represented in the figure, the upperextremities m m m m, of its sockets coincide to allappearance with a horizontal line a b c, upon thewall, door, or window : if this line appears con- ADJUSTMENT IN TRIAL-FRAME. 67 tinuous, the prism is…
Lenses
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