Eye position and electromyographic observation of squint eyes under general anesthesia.

The position of eyes under general anesthesia was measured in different groups of nonparalytic strabismus. Almost all patients with esotropia or hyperactive inferior oblique muscle showed divergent eye positions while patients with exotropia showed no consistent trend. The eye position of patients with lid ptosis without squint, which served as a control group, were divergent in all cases. Electromyographic observation of the medial rectus muscle under the same condition of anesthesia revealed that muscle discharge disappeared almost completely at the stage at which the eyes were in a well-stabilized position.