Date of Award
Master of Science in Vision Science
William M. Ludlam
The Visual Evoked Response (VER) is an electrical response by the brain to visual stimulation. It is one of the evoked potentials used frequently in clinical neurophysiology. It has also begun to offer more and more information to the clinical optometrist. In this paper we compared the relationship between the VER and Amblyopia. We divided our amblyopia population (5) into two categories, deprivation and non-deprivation (fixation anomaly) amblyopia. We then measured the amplitudes of the VER responses to varied acuity check sizes. Although amplitudes are less reliable than latencies, we averaged the amplitudes over several VER recordings and repeated trials. Then we compared the results of post-visual training VER's with the pre-training VER's. We found that in non-deprivation amblyopia, there was not a significant increase in VER amplitudes after training. However, in the deprivation amblyopes the amplitudes did change after training. Thus, there appears to be an increase in visual cortex cell response after training in the deprivation amblyopia population.
Fuerst, Randall and Schleisman, Terry, "Prediction of after-training changes in acuity of amblyopes using the patterned V.E.R." (1983). College of Optometry. 654.