By Merrick Moseley BSc PhD, Alistair Fielder MD
This booklet presents a precis and synthesis of present concerns and examine in the box of 1 of the main demanding paediatric eye stipulations - Amblyopia.
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Additional resources for Amblyopia: A Multidisciplinary Approach, 1e
T. and Klein. S. A. ( 1999). Optimum spatial localization is limited by contrast sensitivity. • 39, 503-11. Dernanins, R. and Hess. R. F. (1996). Positional loss in strabismic amblyopia - interrelationship of alignment threshold. bias, spatial scale and eccentricity. Vision Res .. 36, 2771-94. • Wang. -Z. and Hess. R. F. (1999). The neural deficit in strabismic amblyopia: sampling considerations. , 39, 3575-85. Field. D. • Hayes. A. and Hess. R. F. (1993). Contour integration by the human visual system: evidence for a local 'association field'.
Our question is answered; the positional abnormality is scale-invariant - that is, it cannot be thought of in terms of a fixed spatial dimension for any individual amblyope (see also Demanins and Hess, 1996). The neural representation of space is equally disrupted at all scales. 7) in minutes of arc for the normal (unfilled symbols) and fellow amblyopic eyes (filled symbols) of six strabismic amblyopes. The positional loss is large and scale invariant (from Hess and Holliday, 1992). T. F. F.. A.
That said, some YEP studies have proved fruitful in understanding which cortical pathways might be affected in amblyopia. For example, Kubova et al. (1996) suggested that the magnocellular (M) pathway might be relatively spared in amblyopia. They used small-check patterns, stimulation being restricted to various parts of the visual field (peripheral Vs central vision, full field Vs foveal). They measured a pattern reversal YEP, where the checks were slowly counterphased at I Hz; and a motion onset YEP, where the checks moved rightwards at 6deg/s.