Inferior oblique muscle function : correlation between scleral insertions of inferior, lateral recti and inferior oblique muscles and clinical function of inferior oblique muscle.

Primary hyperfunction of the inferior oblique muscle causes elevation of the non-fixing eye in adduction. The goal of this work was to measure the position of the scleral insertion of the inferior oblique muscle compared with those of the lateral and inferior recti muscles and to assess if these measures were correlated to clinical hyperfunction. 122 eyes from 78 strabic children, ranging from 30 to 196 months, 29 boys and 49 girls, 74 esotropia, 48 exotropia, 57 right eyes and 65 left eyes, have been included. This study shows the innervationnal theory to be most likely to explain the hyperfunction of inferior oblique muscle.