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 170
rical centre be placed just below thistooth, the index points to the number which mea-sures the physical angle of the virtual prism withwhich the lens is combined. This does not initself, however, give us much information about the ANALYSIS OF SPECTACLES. 149 effect of the spectacles on the visual… … Fig. 62.—The prism measure, used to discover the opticalcentre of a lens. mark this distance by an ink dot on the glass,then we can place the said ink dot under the toothand read off what prism is virtually combined withthe lens at this point, directly in front of the eye.In this way we discover…
Lenses
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