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Effect of roll tilts on absolute horizontal and vertical positions of the eye. 2a,c: eye positions plotted versus tilt angle of interocular axis. 2b,d: eye positions for the central ±90° of tilt replotted versus the fraction of the gravity vector projecting into the horizontal plane. Dashed lines indicate the eye position predicted from the simple geometrical model. Directions of roll are reported with respect to the recorded eye.
