Disinserted extraocular muscles.

In two patients, a muscle that slipped from the globe posteriorly created the clinical pattern of reduced rotation amplitude, reduced saccadic velocity, reduced active force, and increasing exophthalmos with gaze into the field of action of the muscle. The muscle was surgically identified by an electronic stimulator that caused the muscle to contract, thus allowing the surgeon to fell it pull on the forceps or see its traction on adjacent tissues.