Results 251 to 260 of about 83,211 (286)

Ocular Motor Fixation Deficits in Friedreich Ataxia

The Cerebellum, 2010
Friedreich ataxia (FRDA) is the most common genetic cause of ataxia with a prevalence of approximately 1 in 29,000. Ocular motor abnormalities are common in FRDA and include fixation instability, saccadic dysmetria, and vestibular dysfunction. It has not yet been determined whether aspects of spatial attention, which are closely coupled to eye ...
Hocking, Darren, Fielding, Joanne, Corben, LA, Cremer, Phillip D, Millist, Lynette, White, Owen B, Delatycki, MB   +6 more
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Effect of ocular fixation on positional nystagmus in BPPV patients

International Journal of Audiology, 2022
The quantitative suppression rate of positional nystagmus (PN) by ocular fixation (OF) is unknown. This study aims to analyse the effect of OF on the slow phase velocity (SPV) of PN during diagnostic positional manoeuvres (DPMs) with videonystagmography in patients with benign paroxysmal positional vertigo (BPPV).DPMs were performed on 58 patients with
Halil Erdem Özel, Ahmet Taha Karakuzu, Hümeyra Temir, Muhammed Alpay, Fatih Özdoğan, Selahattin Genç   +5 more
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The Ocular Fixation Index

Annals of Otology, Rhinology & Laryngology, 1973
The effects of ocular fixation on normal and pathological nystagmus are reviewed, and in particular the effect of opening the eyes during the caloric test is analyzed. The Ocular Fixation Index of Demanez was applied to the records of 100 patients, and the findings tend to confirm the usefulness of this Index as a means of distinguishing peripheral ...
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Unilateral pallidotomy for Parkinson’s disease disrupts ocular fixation

Journal of Clinical Neuroscience, 2003
Although some motor functions of the basal ganglia have been well studied, the oculomotor functions are not well established. We studied eye movements in patients with Parkinson's disease (PD) undergoing pallidotomy to assess the role of the globus pallidus interna (GPi) in oculomotor control.
O'Sullivan, JD, Maruff, P, Tyler, P, Peppard, RF, McNeill, P, Currie, J   +5 more
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Ocular fixation, vestibular dysfunction, and visual motion hypersensitivity

Optometry - Journal of the American Optometric Association, 2009
A subgroup of individuals with vestibular dysfunction and visual motion hypersensitivity (VMH) become dizzy and imbalanced in response to movement of the visual environment. The purpose of this study was to investigate ocular fixational stability during gaze on a target, with and without visual background movement.
Winkler, Patricia A., Ciuffreda, Kenneth J.   +1 more
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Binocular Coordination, Fixation Disparity, and Ocular Dominance

Perception, 1996
In a series of experiments we have quantified the spatial and temporal dynamics of binocular coordination. Tasks studied ranged from simple scanning and letter detection to complex visual processing in text reading. In all of these paradigms we found similar eye movement characteristics: in 70% to 90% of the observations, the saccade of the abducting ...
R Radach, D Heller, P Wiebories, W Jaschinski   +3 more
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The Effect of Ocular Fixation on the Caloric Nystagmus

ORL, 1974
The effect of fixation and nonfixation upon the caloric nystagmus was studied in 30 normal volunteers.
E M, Molnar, N, Torok
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Ocular Fixation Abnormality in Patients with Autism Spectrum Disorder

Journal of Autism and Developmental Disorders, 2016
We examined the factors that influence ocular fixation control in adults with autism spectrum disorder (ASD) including sensory information, individuals' motor characteristics, and inhibitory control. The ASD group showed difficulty in maintaining fixation especially when there was no fixation target.
Aya, Shirama, Chieko, Kanai, Nobumasa, Kato, Makio, Kashino   +3 more
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Infant responses of ocular fixation to moving visual stimuli

Journal of Experimental Child Psychology, 1976
Abstract Infants of 1, 2, and 3 months of age were presented with two checkerboard patterns, one stationary and the other moving in a horizontal oscillatory motion at one of eight rates. An observer who could see only the infant's head and eyes recorded, for each 30-sec trial, (a) the position of first fixation, (b) position of fixation at the end of
F C, Volkmann, M V, Dobson
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Fixational ocular motor control is plastic despite visual deprivation

Visual Neuroscience, 2002
The aim of this study was to assess the plasticity of human voluntary fixational eye movement control in relation to visual experience/chronic visual deprivation. Twelve blind adults participated (self-reported vision ≤ light perception in each eye; age range = 23–56 years; visual experience range = 0–28 years; blindness duration range = 6–55 ...
E C, Hall, K J, Ciuffreda
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