New PDF release: Advances in Understanding Mechanisms and Treatment of

By R. John Leigh, Michael W. Devereaux

ISBN-10: 0195342186

ISBN-13: 9780195342185

ISBN-10: 0199711801

ISBN-13: 9780199711802

This quantity brings jointly paintings from best researchers within the fields of developmental issues of binocular imaginative and prescient, strabismus, and either childish and purchased sorts of nystagmus. It comprises 4 sections. the 1st part, simple suggestions of solid imaginative and prescient and Gaze, offers with psychophysical facets of childish kinds of nystagmus and the relative contributions of extraocular proprioception and efference (corollary discharge). It additionally comprises an obtainable evaluation of present notions of spatial and temporal visible services and spatial fidelity in childish nystagmus syndrome and latent nystagmus. the second one part, New versions and strategies for learning Gaze balance, studies animal and improvement versions for strabismus, amblyopia, and nystagmus. It additionally comprises novel optical equipment for dealing with the visible effects of nystagmus and a learn of the capability unwell results of video screens on kid's reaction to close viewing. The 3rd part, New remedies for Congenital Nystagmus, provides simple genetic experiences and medical trials of drug and surgical procedure of these sufferers with childish kinds of nystagmus. the ultimate section,General points of ordinary and irregular Gaze keep watch over, pulls jointly various contributions facing basic gaze keep an eye on, childish nystagmus, and purchased problems of eye activities, together with new remedy measures. This ebook should be a helpful source for all scientists and practitioners attracted to developmental problems of imaginative and prescient.

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Extra info for Advances in Understanding Mechanisms and Treatment of Infantile Forms of Nystagmus

Sample text

Neither CN nor MLN waveforms were related to any of the three subject groups (idiopaths, albinos, and ocular anomalies), although MLN was found to occur most frequently in the ocular anomaly group. Visual performance in IN is, for the most part, dependent on three factors: (1) the range of retinalimage slip velocities, (2) foveation, and (3) the state of the eye and visual pathways. Most clinicians are likely to measure the spatial resolution limit (that is, VA) and stereoacuity, and to note the presence of any associated smear or motion of the visual scene.

64 These results suggest that single-letter acuity tests may overestimate VA when compared to a traditional Snellen or a LogMAR chart. Hyperacuity tasks include vernier and stereo detection thresholds. 28,34,59,66 PRECEPTION WITH UNSTABLE FIXATION 27 Motion Perception and CN A number of studies have indicated that motion perception thresholds are raised in CN. 67 Spatial Constancy and CN Patients with CN rarely experience movement in their visual environment. That is, they are not usually aware of any oscillopsia and report a state of perceptual stability or spatial constancy.

1). 20 These results are in contrast to those of normal subjects, whose orientation-discrimination thresholds are uniformly larger than the SDs of torsional eye position during fixation. Because orientation-discrimination thresholds in 3 of the subjects with IN are reliably smaller than the variability of their torsional eye position, we conclude that extraretinal signals compensate partially for the changes in retinal-image orientation that result from the torsional component of IN. THEORETICAL CONSIDERATIONS CONCERNING EXTRARETINAL EYE MOVEMENT SIGNALS IN IN An important potential limitation on the usefulness of extraretinal eye movement signals for maintaining perceptual stability in normal observers may be their limited temporal fidelity.

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Advances in Understanding Mechanisms and Treatment of Infantile Forms of Nystagmus by R. John Leigh, Michael W. Devereaux

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