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Abstract
The records of 76 patients who underwent bilateral anterior transposition of the inferior oblique muscles were retrospectively reviewed with respect to the effect that this surgery had on inferior oblique function, “V” pattern, and reduction or prevention of dissociated vertical deviation. The records of 34 patients who underwent bilateral inferior oblique myectomies were reviewed for comparison with the anterior transposition group. Inferior oblique muscle anterior transposition was slightly less effective than myectomy in normalizing inferior oblique function and eliminating “V” pattern, but was more effective in preventing small-to-moderate cases of dissociated vertical deviation from developing in patients who initially had bilateral inferior oblique muscle overaction but no dissociated vertical deviation. Anterior transposition of the inferior oblique muscles was also successful in eliminating or reducing the severity of dissociated vertical deviation in the majority of patients who had inferior oblique overaction and dissociated vertical deviation.