Efficacy of different techniques of superior oblique weakening in the correction of the "A" anisotropia.

The authors present the results of 118 operations in which five different techniques for superior oblique weakening were employed for the correction of "A" pattern: recession of the tendon, split-lengthening, posterior fiber tenectomy near the scleral insertion, full tenectomy near the scleral insertion and marginal tenotomy (Z lengthening). In all the techniques but one, the marginal tenotomy, a high percentage of correction and a good coefficient of correlation between initial incomitance and obtained correction were found. We propose a new technique of superior oblique weakening, the full tenectomy of the tendon near the scleral insertion, and an easy, safe and effective technique.