Foveal Vision in Amblyopia

Foveal vision in amblyopia.

THE reduced visual acuity in amblyopic eyes has presented a.problem ever since the condition was recognized. Most of the evidence so far favours the cortex as the site of inhibition (Vogt, 1939; Wald and Burian, 1944; Dyer and Bierman, 1952). Clarke (1941) thought that the cause might be an atrophy from disuse affecting the cells of the lateral geniculate body which rely for their vitality on t...

Amblyopia and Foveal Thickness

Modeling Foveal Vision

A geometric model is proposed for an artificial foveal vision system, and its plausibility in the context of biological vision is explored. The model is based on an isotropic, scale invariant two-form that describes the spatial layout of receptive fields in the the visual sensorium (in the biological context roughly corresponding to retina, LGN, and V1). It overcomes the limitation of the famil...

Discriminating mirror symmetry in foveal and extra-foveal vision

The ability to discriminate perfect from imperfect mirror symmetry was examined at the fovea and at eccentricities out to 10 degrees in the nasal visual field. A 2-AFC method of constant stimuli was employed in which a bilaterally symmetric pattern was presented in one interval and a degraded version of this symmetric pattern in the other. The subject's task was to decide which interval contain...

Amblyopia and binocular vision.

Amblyopia is the most common cause of monocular visual loss in children, affecting 1.3%-3.6% of children. Current treatments are effective in reducing the visual acuity deficit but many amblyopic individuals are left with residual visual acuity deficits, ocular motor abnormalities, deficient fine motor skills, and risk for recurrent amblyopia. Using a combination of psychophysical, electrophysi...