Congenital "see-saw" movement. A rare anomaly of ocular motility.

ATTEMPTED INFRA-LAEVOVERSION: Mild right divergent squint (Fig. ia). Left hypertropia. Right eye abducted normally and showed nystagmoid movements (Fig. ib). Right eye hypertropic and showed defect of adduction. Left eye abducted normally (Fig. Ic). Right eye diverged mildly with no elevation. Left eye moved up and inwards (Fig. id). Right eye showed defective abduction and no elevation. Left eye went up but showed defective adduction (Fig. ie). Right eye adducted only. Left eye moved up and abducted well (Fig. if). There was a "see-saw" movement. The right eye moved up and outwards, while the left rotated down and slightly outwards (Fig. ig). The right eye moved up and outwards, while the left rotated down and inwards (Fig. ih). The right eye moved up and outwards, while the left rotated down and outwards (Fig. ii). On attempt to elicit convergence or Bell's phenomenon, the right eye moved up and outwards while the left eye rotated down and outwards.