Abstract
A filter based upon an AutoRegressive with exogenous input (ARX) model is applied in the study of the recovery dynamics after a photostress in normal and diabetic subjects. The ARX model allowed to analyze, on a single sweep basis, the visual evoked potentials (VEPs) both in stationary conditions and during the recovery phase after a dazzlement. The Ploo wave peak was analyzed in each single sweep and its amplitude was evaluated as an objective and quantitative index of the status of the retinal system. In particular, a different distribution of the Ploo amplitudes was evidenced between normal and diabetic subjects in stationary conditions; the recovery time after photostess was estimated, for normal subjects, as the constant time of the exponential function fitting the Ploo series obtained after the photostress. In diabetic patients it was not possible to obtain any recovery trend.
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