Children suspected of being amblyopic are generally referred for electrodiagnostic testing in order to exclude other pathologies, e. g., when visual acuity has not improved with patching and the fundi are normal or when visual acuity is reduced bilaterally. In amblyopic eyes, pattern visual evoked potentials often show amplitude reduction and/or mild to moderate delay [75, 79] that is not due to optical factors [52]. Generally, latency abnormalities in the major positive (P100) component tend to be milder in ani-sometropic than with strabismic amblyopia. Pattern VEPs may also play a useful role in monitoring the effects of patching therapy in amblyopic and fellow eyes [83,87].

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