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 107
es z, i indicate theinitial convergence during waking hours, due partlyto muscular tone, and partly to involuntary tonicaction of the converging innervation. It is thisposition of the visual axes [i z), to which they arebrought by tonic convergence, that is noticed whenwe use V. Graefes distant… … Fig. 44.—The three grades of convergence. an excess, of tonic convergence. In either case theaberration is corrected, when both eyes are in useby reflex convergence, positive or negative, as thecase may be. Excess of tonic convergence is sometimes apt tooccur temporarily after prolonged use of the…
Lenses
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