Static Ocular Counterroll: Video-based Analysis After Minimizing the False-Torsion Factors
نویسندگان
چکیده
منابع مشابه
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...
متن کاملHyperdeviation 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...
متن کاملDissociated 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...
متن کاملConvergence 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...
متن کاملStatic ocular counterroll is implemented through the 3-D neural integrator.
Static head roll about the naso-occipital axis is known to produce an opposite ocular counterroll with a gain of approximately 10%, but the purpose and neural mechanism of this response remain obscure. In theory counterroll could be maintained either by direct tonic vestibular inputs to motoneurons, or by a neurally integrated pulse, as observed in the saccade generator and vestibulo-ocular ref...
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ژورنال
عنوان ژورنال: Japanese Journal of Ophthalmology
سال: 2005
ISSN: 0021-5155,1613-2246
DOI: 10.1007/s10384-005-0254-4