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Torsional shift of rectus pulleys in the 90° roll tilt up-versus-down positions in 31 normal control orbits and 12 affected and 12 fellow orbits in subjects with SO palsy and in 10 hypertropic and 10 hypotropic orbits of subjects with masquerading SO palsy. Note the reversed shift of LR and IR pulleys in the orbits with SO palsy, but different patterns of pulley shift in both orbits in masquerading SO palsy. Deg, degrees; Hyper, hypertropic; Hypo, hypotropic.
