DETECTION DIRECTION AND DrSCRIMINATION OF THE OF MOTION IN CENTRAL AND PERIPHERAL VISION OF NORMAL AND AMBLYOPIC OBSERVERS

This paper describes the “motion” properties of the ambiyopic fovea and compares them to the normal periphery. Specifically, thresholds for defection of the displacement of a grating pattern, and for discrimination of displacement direction were measured. The main findings of these experiments were: (I) in the central vision of both normal and amblyopic observers, unreferenced displacements are detected with an accuracy equal to the observer’s grating acuity; (2) in the normal periphery, unreferenced motion thresholds fall off at a slower rate than does grating acuity; (3) in amblyopic eyes, displacement thresholds are most elevated centrally; (4) the addition of an abutting reference improves detection of motion for the normal fovea and in anisometropic amblyopes, but elevates motion thresholds in both the normal periphery and in the fovea of amblyopes with strabismus. The adequacy of the normal periphery as a model for the central vision of ambfyopes is discussed. Motion Acuity Amblyopia Peripheral vision Eccentricity Scaling Cortical magnification