ABSTRACT
Conventional surgery is calculated on the basis of the waking-state angle. In order to reduce the variance of the results, passive force imbalance in the horizontal rectus pair should be taken into account. Patients and method. In 80 children with infantile esotropia the angle under anaesthesia and the differential of muscle extensibility were assessed. Bilateral posterior fixation and uni or bilateral medial rectus recessions, adjusted if necessary during surgery according to the intra-operative data, were carried out. Results’. The postoperative minimum angle was most often between -4° and + 4° in the cases where adjustment was carried out. Discussion and conclusion’. The results 1) demonstrate the validity of intra-operative data as additional parameters, 2) suggest that by taking these into account variance in results is reduced.
