Effects of Earth-Fixed vs Head-Fixed Targets on Static Ocular Counterroll
نویسندگان
چکیده
منابع مشابه
Effects of earth-fixed vs head-fixed targets on static ocular counterroll.
OBJECTIVE To investigate whether static ocular counterroll (OCR) gain is reduced during viewing of an earth-fixed vs a head-fixed target. METHODS Twelve healthy individuals were recruited. The target consisted of a red fixation cross against a grid pattern at a viewing distance of 33 cm. The target was mounted on a wall (earth fixed) or was coupled to the head (head fixed). Changes in mean to...
متن کاملCLINICAL SCIENCES Effects of Earth-Fixed vs Head-Fixed Targets on Static Ocular Counterroll
Methods: Twelve healthy individuals were recruited. The target consisted of a red fixation cross against a grid patternataviewingdistanceof33cm.Thetargetwasmounted onawall(earthfixed)orwascoupledtothehead(headfixed). Changes in mean torsional eye position were plotted as a function of head position steps (0°±25° in 5° steps), and sigmoidal fits were performed. Mean static OCR gain was calculate...
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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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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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The ocular counterroll (OCR) reflex generates partially compensatory torsional eye movements during static head roll tilt. We assessed the influence of age, viewing distance and target complexity on the OCR across the age span (13-63 years; n=47), by recording eye movements during head-on-body roll tilt (0+/-40 degrees in 5 degrees steps) while subjects viewed simple vs. complex targets at 0.33...
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ژورنال
عنوان ژورنال: Archives of Ophthalmology
سال: 2010
ISSN: 0003-9950
DOI: 10.1001/archophthalmol.2010.14