When people get a new prescription for glasses that involves a sudden increase of several diopters, they often complain of dizziness and disorientation. Fortunately, it disappears in a few days. What caused it? Well, suppose the new glasses magnified everything by 20%. If the patient turns his head to the left at 100 deg/sec (a modest velocity) the visual world turns to the right (relative to the head) at 120 deg/sec, with his new glasses on. But the vestibuloocular reflex (vor) is only moving the eyes in a compensatory movement at 100 deg/sec to the right, just like it used to before the new glasses. Thus, the images of the world now appear to slip to the right at 20 deg/sec.
KeywordsPurkinje Cell Mossy Fiber Inferior Olive Climbing Fiber Retinal Slip
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