Results 261 to 270 of about 83,123 (308)

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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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.
Robert W. Baloh, Andrew W. Sills, Leda Solingen, Vicente Honrubia   +3 more
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Ocular fixation and macular integrity by microperimetry in multiple sclerosis

Graefe's Archive for Clinical and Experimental Ophthalmology, 2020
To characterize the fixation and macular integrity of subjects with multiple sclerosis (MS) with and without previous optic neuritis (ON) using microperimetry (MP).Fifty-five eyes of MS patients, subdivided into three groups (28 eyes without ON, 16 with previous ON, and 11 eyes with previous ON in the contralateral eye), and 43 healthy eyes were ...
Amparo Gil-Casas, David P. Piñero Llorens, Ainhoa Molina-Martin   +2 more
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Average double-pass ocular diattenuation using foveal fixation

Journal of Modern Optics, 2008
The average amount of ocular diattenuation was studied using a double-pass polarimeter. This was directly computed from the central part of the elements of the first row of the Mueller matrix obtained from a series of 16 double-pass retinal images. For a 633 nm wavelength, the results show that the parameter is 0.10, on average.
Juan M. Bueno, Pablo Artal
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Localization of Static Positional Nystagmus With the Ocular Fixation Test

The Laryngoscope, 1999
AbstractObjective: Characteristics of static positional nystagmus (SPN) (i.e., persistency, direction fixed, direction changing) are observed in both peripheral and central disturbances and possess no localizing value for vestibular lesions. Our objective was to investigate whether the ocular fixation test as applied to SPN could assist in localizing ...
R, Maire, B, Duvoisin
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Effects of Six Conditions of Ocular Fixation on Caloric Nystagmus

Archives of Otolaryngology - Head and Neck Surgery, 1980
Caloric tests were performed on 20 normal volunteers under the following six conditions of ocular fixation: (1) eyes open with lighted +20-diopter lenses; (2) eyes open with lighted +20-diopter lenses plus strobe lighting; (3) eyes open in darkness; (4) eyes closed in darkness; (5) eyes closed in a dimly lighted room; and (6) eyes open with unlighted ...
E A, Karlsen, C P, Goetzinger, R, Hassanein   +2 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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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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Ocular fixation index and mathematical models.

Acta oto-rhino-laryngologica Belgica, 1998
Ocular fixation test and ocular fixation index (OFI) never have been interpreted in terms of mathematical models, despite their widespread diffusion. However, ocular fixation is a typical case of visual-vestibular interaction, and mathematical models have proven very helpful in interpreting some mechanisms of this interaction, e.g.
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