Read e-book online Advances in Understanding Mechanisms and Treatment of PDF

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 prime researchers within the fields of developmental problems of binocular imaginative and prescient, strabismus, and either childish and purchased kinds of nystagmus. It includes 4 sections. the 1st part, simple strategies of strong imaginative and prescient and Gaze, bargains with psychophysical features of childish kinds of nystagmus and the relative contributions of extraocular proprioception and efference (corollary discharge). It additionally comprises an obtainable overview of present notions of spatial and temporal visible features and spatial fidelity in childish nystagmus syndrome and latent nystagmus. the second one part, New types and methods for learning Gaze balance, studies animal and improvement types for strabismus, amblyopia, and nystagmus. It additionally includes novel optical equipment for coping with the visible outcomes of nystagmus and a research of the aptitude unwell results of video monitors on kid's reaction to close viewing. The 3rd part, New remedies for Congenital Nystagmus, offers easy genetic reviews and medical trials of drug and surgical procedure of these sufferers with childish different types of nystagmus. the ultimate section,General elements of ordinary and irregular Gaze keep watch over, pulls jointly a number contributions facing common gaze keep an eye on, childish nystagmus, and purchased problems of eye pursuits, together with new therapy measures. This e-book might be a important source for all scientists and practitioners attracted to developmental problems of imaginative and prescient.

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Additional resources for Advances in Understanding Mechanisms and Treatment of Infantile Forms of Nystagmus

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One way for extraretinal eye movement signals to contribute usefully to perceptual stability is for these signals to undergo less low-pass filtering in persons with IN than in normal observers. This suggested difference between the temporal filtering characteristic of the extraretinal signals in IN and normal observers is presumed to be an adaptive consequence of the early abnormal visual experience in IN. 36,37 However, an obvious question is why the extraretinal signals that accompany normal eye movements should be temporally low-pass filtered in the first place.

A number of different mechanisms have been proposed to account for spatial constancy in CN. These include (a) reduced sensitivity to retinal-image motion, (b) adaptation to retinal-image motion, (c) information sampled only when the eyes are moving relatively slowly during foveation periods, and (d) the use of extraretinal information to cancel the effects of the eye movements. Such extraretinal signals include efference copy (outflow), in which a copy of the CN oscillation command signal cancels the effect of subsequent retinal-image motion and proprioception.

Listing’s law, eye position sense, and the perception of the vertical. Vision Res. 1977;17:453–457. Haustein W, Mittelstädt H. Evaluation of retinal orientation and gaze direction in the perception of the vertical. Vision Res. 1990;30:255–262. Poljac E, Lankheet MJ, van den Berg AV. Perceptual compensation for eye torsion. Vision Res. 2005; 45:485–496. Haustein W. Head-centric visual localization with lateral body tilt. Vision Res. 1992;32:669–673. Wade SW, Curthoys IS. The effect of ocular torsional position on perception of the roll-tilt of visual stimuli.

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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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