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 63
as a refracting angle of 12°, and the instru-ment is marked accordingly. Landolt has had itmarked in degrees of deviation, and metre angles.If we wish to know how strong a prism can beplaced before one eye without creating diplopia,we start at zero, and press up the button till double 48 PRISMS.… … Fig. 24.—Risleys Rotary Prism. delphia. It is small and circular, and can be placedin an ordinary trial-frame. On turning the littlebutton the two prisms, each of 15°, rotate in oppo-site directions. The diameter in which the buttonlies coincides with the base-apex line of the virtualprism, however…
Lenses
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