Psychophysical Examination Research Articles

Electrophysiologic Aspects of Amblyopia

This paper presents a sampling of the psychophysical and electrophysiologic examinations which have been applied to determine the location of the visual processing defect in functional amblyopia. Areal summation and lateral inhibition are discussed along with methods for determining their extent at different locations in the visual system. Using psychophysical and visual-evoked response data from a series of these tests in humans, a case is made that the outer retina is the locus of a major defect leading to the loss of visual resolution in functional amblyopia.

Electrodiagnostic procedures in drug-induced ocular diseases.

Modern electrophysiological methods like electro-oculography (EOG), electroretinography (ERG) and visually evoked cortical responses (VER) enable us to determine objectively the localization and the extent of drug-induced diseases in many cases. Sometimes more information can be obtained when advanced examination methods, such as the local foveal ERG, are used. The objective examination methods mentioned above are not the only techniques to rely on when the early diagnosis of drug-induced diseases is concerned. These methods have to be supplemented by other objective and psychophysical examination methods. Follow-up of electrodiagnostic results may be quite helpful in giving a reliable prognosis in drug-induced ocular diseases.