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This article was written several years ago. It is now published in order to supplement the writer's opening paper at the Oxford Congress, 1924, on the “Treatment of Convergent Concomitant Strabismus.” It is much to be regretted that an error crept into the MS. of Table II, as sent to the printer (Trans. Ophthal. Soc. of the U.K., 1924, p. 241) where the figures for the 4th group are wrongly given. The correct figures for the 24 Emmetropic cases are: Orthophoria, 1; exophoria, 5; esophoria, 18; the ratio exophoria to esophoria being 1 to 3.6.