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From the Neurology Department, Royal Prince Alfred Hospital, Sydney, Australia.
PURPOSE. As a normal subject looks from far to near, Listings plane rotates temporally in each eye. Since Listings plane relates to the control of torsional eye position, mostly by the oblique eye muscles, the current study was conducted to test the hypothesis that a patient with isolated superior oblique palsy would have a problem controlling Listings plane.
METHOD. Using the three-dimensional scleral search coil technique, binocular Listings plane was measured in four patients with congenital and in four patients with acquired unilateral superior oblique palsy during far- (94 cm) and near- (15 cm) viewing. The results were compared to previously published Listings plane data collected under exactly the same conditions from 10 normal subjects.
RESULTS. In patients with unilateral superior oblique palsy, either congenital or acquired, Listings plane in the normal eye rotated temporally on near-viewing, as in normal subjects, while in the paretic eye it failed to do so. In patients with acquired superior oblique palsy, Listings plane was already rotated temporally during far-viewing and failed to rotate any farther on near-viewing, whereas in patients with congenital superior oblique palsy Listings plane in the paretic eye was oriented normally during far-viewing and failed to rotate any farther on near-viewing.
CONCLUSIONS. These results suggest that the superior oblique muscle, at least in part, is responsible for the temporal rotation of Listings plane that occurs in normal subjects on convergence.
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