Threshold determination in sweep VEP and the effects of criterion

摘要

In order to develop criteria for the range of data points used for regression line fitting in sweep visually evoked potential (sVEP), which would be objective, clearly specified and give good repeatability and validity, and in order to investigate the effect of luminance on sVEP measurement, visual acuity (VA) and contrast sensitivity (CS) were measured with sVEP in adults aged 17–30 years and children aged 6–8 years. Six to ten participants took part in each experiment. Five criteria (C0–C4) for fitting the regression line were implemented. Test–retest repeatability and validity against psychophysical thresholds at three luminance levels were considered for thresholds and the number of acceptable readings. There were significant effects of criteria (repeated measures ANOVAs, P 0.05). There was little effect of luminance over the 25–100 cd/m2 range used. Overall, C2 performed the best and would be the criterion of choice, giving better repeatability, better validity and more viable plots. Keywords sVEP - Visually evoked potential - Contrast sensitivity - Visual acuity