Abstract
Electromyographic recordings were obtained from external rectus muscles of patients with intermittent exotropia (“divergence excess” type). Before the operation the lateral rectus muscle of the covered, deviating eye invariably showed an increase in its electric activity while the electric activity of the horizontal muscles in the fixing eye remained unchanged. During the operation no increase in electric activity of the lateral rectus muscle could be found on the alternating cover test when (a) the tested muscle was severed from its insertion (though the activity at rest remained the same) or (b) when the surgical procedure produced orthophoria. This immediate change in innervational pattern speaks against the theory of "divergences excess as the mechanism of intermittent exotropia.
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