Results 261 to 270 of about 447,001 (304)

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 ...
R Radach, D Heller, P Wiebories, W Jaschinski   +3 more
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Ocular translation and cyclotorsion due to changes in fixation distance

Vision Research, 1980
Abstract When an observer, looking straight ahead with one eye occluded, aligns a nearby target with a more distant one, and then alternately fixates upon the near and far targets, the iris and pupil of the viewing eye shift back and forth laterally by as much as 200 μm, and produce fixation-dependent misalignment of the targets.
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1. Effect of Different Conditions of Ocular Fixation

Annals of Otology, Rhinology & Laryngology, 1977
Twelve normal subjects received standard caloric testing under the following conditions: 1) fixation, 2) Frenzel glasses in a dimly lit room, 3) eyes open in total darkness, and 4) eyes closed. Multiple nystagmus response parameters were evaluated and statistically compared for each condition. Fixation markedly diminished induced nystagmus and produced
Robert W. Baloh, Andrew W. Sills, Leda Solingen, Vicente Honrubia   +3 more
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The contribution of the fixational eye movements to the variability of the measured ocular aberration

Ophthalmic and Physiological Optics, 2009
Abstract The purpose of this work is to analyze the contribution of eye movements to the variability of the Zernike coefficients as determined with a Hartmann–Shack aberrometer. In order to isolate this effect we considered static aberrations tied to the eye pupil.
J, Arines, E, Pailos, P, Prado, S, Bará
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Ocular fixation and visual activity in the monkey lateral intraparietal area

Experimental Brain Research, 2002
The macaque lateral intraparietal area (LIP) has been implicated in visuospatial attention and saccade planning. Since area LIP also contains a representation of the central visual field, we investigated its possible role in fixation and foveal attention in a visual fixation task with gap (momentary disappearance of fixation point).
S, Ben Hamed, J-R, Duhamel
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Failure of Fixation Suppression of Caloric Nystagmus and Ocular Motor Abnormalities

Archives of Neurology, 1980
Caloric nystagmus is substantially suppressed by visual fixation. The degree of suppression of caloric nystagmus is influenced by the condition of visual fixation. We studied the percent reduction in slow-phase velocity of caloric nystagmus by visual fixation and certain abnormalities in optokinetic nystagmus, smooth pursuit, and maintenance of ocular ...
Y, Sato, I, Kato, T, Kawasaki, K, Mizukoshi, M, Hayano   +4 more
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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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Ocular oscillations induced by shifts of the direction and depth of visual fixation

Annals of Neurology, 2001
Shifts of the point of fixation between two targets aligned on one eye that are located near and far (Müller paradigm) stimulates a combined saccadic-vergence movement. In normal subjects, this test paradigm often induces saccadic oscillations of about 0.3 degrees at 20 to 30 Hz.
Bhidayasiri J. T., Somers J. T., Kim J. I., Nayak S., Boki H. S., Leigh R. J., RAMAT, STEFANO   +6 more
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Assessing inter-ocular fixational eye movements throughout the lifespan

Experimental Brain Research
This study aims to assess fixational eye movements (FEMs) obtained under binocular and monocular viewing in normal individuals across different age groups. We recruited 68 healthy participants divided into Group 1 (children, 3-9 years, n = 20), Group 2 (adolescents, 10-19 years, n = 26), and Group 3 (adults, 20-73 years, n = 22).
Sophie C, Yue, Gokce B, Cakir, Aasef, Shaikh, Fatema F, Ghasia   +3 more
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[The status of ocular fixation in civil aviation pilots].

Kosmicheskaia biologiia i aviakosmicheskaia meditsina, 1991
This paper discussed the importance of gaze fixation for professional pilot activities. It describes new methods for evaluating mono- and binocular fixation. The results of examinations of pilots with mild emmetropia and ametropia demonstrate that qualitative parameters of gaze fixation are important adequate assessment of visual abilities.
S V, Panferov, T I, Miliavskaia, E A, Evseev, S L, Shapovalov   +3 more
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