THE EFFECT OF ROLL-TILT ON OCULAR SKEW DEVIATION

Static roll-tilt of normal healthy subjects causes the ocular tilt rea ction (OTR) one component of which is disconjugate vertical eye positi on (skew deviation). In this study the magnitude of skew was measured subjectively by the use of a computerized Hess test at three static ro ll-tilt angles (head erect, left ear down and right ear down) and two viewing distances (20 cm and 60 cm). The results showed that during st atic roll-tilt there was a small skew deviation, the magnitude of whic h was increased at close viewing distances.