Bilateral recession of the superior oblique in "A" pattern tropia.

A bilateral recession of an overacting superior oblique was performed in nine patients with "A" pattern ranging from 12 to 48 diopters, with an average of 24 prism diopters.There were six esotropic and three exotropic subjects. In all cases but one, some surgery of one or two horizontal recti was done at same time.An under correction was observed in two patients, of respectively 13 and 9 prism diopters. An overcorrection not exceeding 15 prism diopters was seen in six patients; in four it measured 3 prism diopters or less. A full correction was obtained in one case. The mean correction of "A" pattern was 25 prism diopters.Complications were not observed during the follow-up period.