Fig. 2
From: Age- and frequency-dependent changes in dynamic contrast perception in visual snow syndrome
Dynamic contrast threshold as a function of temporal flicker frequency [Hz] for VSS patients and controls. Bars and whiskers show the mean of the log10 (contrast threshold) and the 95% confidence interval of the mean. Each cross indicates the threshold of a single subject. VSS patients showed higher contrast thresholds at 15 Hz (asterisk, p < 0.01) but did not differ from controls at higher frequencies