RELATIONSHIP OF EYE-MOVEMENT TO COMPUTED TOMOGRAPHIC FINDINGS IN PATIENTS WITH GRAVES OPHTHALMOPATHY

To elucidate the relationship between eye movement and computed tomogr aphic findings, 101 patients with Graves' ophthalmology were studied. Eye movements were scaled 0 to 3 according to movability. Extraocular muscle width and area were calculated from the largest portion of each muscle from the orbital coronal CT sections. Muscle widths were measu red manually and muscle areas were calculated by a digitizer. The widt h and area of each rectus muscle were significantly correlated with li mitation of eye movement. The muscle widths and areas were also signif icantly correlated to each other (r = 0.91 to 0.77, p < 0.001). Limita tions of supraduction and abduction from enlargement of the inferior a nd medial rectus muscles were the most common clinical findings (46.5% and 39.6%, respectively). In conclusion, this study establishes a rel ationship between limitation of eye movement and extraocular muscle en largement. Calculation of the width from the largest portion of the mu scle manually from orbital coronal section is a simple method for clin ical assessment of the severity of extraocular muscle involvement.