. The clinical use of prisms; and the decentering of lenses . Fig. 50.—Higli fusion supplement (ao) from deficient tonicconvergence (Ri). use the tests described on p. 120. Since the thirdgrade of convergence is complementary to the. Fig. 51.—Same case as Fig. 50, relieved by prisms. other two, its amount can be altered by alteringthem. In Fig. 50, for instance, the tonic conver- THE STUDY OF CONVERGENCE. :oi gence is deficient, the accommodative convergencenormal, and the reflex convergence, therefore,excessive. The relief of this by prisms is shewn inFig. 51, and by tenotomy in Fig. 52. The
. The clinical use of prisms; and the decentering of lenses . Fig. 50.—Higli fusion supplement (ao) from deficient tonicconvergence (Ri). use the tests described on p. 120. Since the thirdgrade of convergence is complementary to the. Fig. 51.—Same case as Fig. 50, relieved by prisms. other two, its amount can be altered by alteringthem. In Fig. 50, for instance, the tonic conver- THE STUDY OF CONVERGENCE. :oi gence is deficient, the accommodative convergencenormal, and the reflex convergence, therefore,excessive. The relief of this by prisms is shewn inFig. 51, and by tenotomy in Fig. 52. The prismsdo not alter the anatomical position of the eyes
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