Convergence reduces ocular counterroll (OCR) during static roll-tilt

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Convergence reduces ocular counterroll (OCR) during static roll-tilt

When humans are roll-tilted around the naso-occipital axis, both eyes roll or tort in the opposite direction to roll-tilt, a phenomenon known as ocular counterroll (OCR). While the magnitude of OCR is primarily determined by vestibular, somatosensory, and proprioceptive input, direction of gaze also plays a major role. The aim of this study was to measure the interaction between some of these f...

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Static ocular counterroll reflex in skew deviation.

OBJECTIVE The static ocular counterroll (OCR) reflex generates partially compensatory torsional eye movements during head roll. It is mediated by the utricle in the inner ear. Skew deviation is a vertical strabismus thought to be caused by imbalance in the utriculo-ocular pathway. We hypothesized that if skew deviation is indeed caused by damage to this reflex pathway, patients with skew deviat...

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Hyperdeviation and static ocular counterroll in unilateral abducens nerve palsy.

Twenty-seven patients with unilateral sixth nerve palsy and ten normal subjects were studied. The range of ductions was examined and the degree of abduction defect was recorded. The amount of horizontal and vertical deviations was measured in nine diagnostic positions by the prism and cover test, Maddox rod and prism test, and magnetic scleral search coils. MRI with enhancement was performed fo...

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Dissociated hysteresis of static ocular counterroll in humans.

In stationary head roll positions, the eyes are cyclodivergent. We asked whether this phenomenon can be explained by a static hysteresis that differs between the eyes contra- (CE) and ipsilateral (IE) to head roll. Using a motorized turntable, healthy human subjects (n = 8) were continuously rotated about the earth-horizontal naso-occipital axis. Starting from the upright position, a total of t...

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Ocular Counter-Rolling During Centrifugation and Static Tilt

Activation of the gravity sensors in the inner ear—the otoliths—generates reflexes that act to maintain posture and gaze. Ocular counter-rolling (OCR) is an example of such a reflex. When the head is tilted to the side, the eyes rotate around the line of sight in the opposite direction (i.e., counter-rolling). While turning corners, undergoing centrifugation, or making side-to-side tilting head...

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ژورنال

عنوان ژورنال: Vision Research

سال: 2004

ISSN: 0042-6989

DOI: 10.1016/j.visres.2004.06.014