• We measured several parameters of cortical potentials evoked by visual stimulation to produce a profile suggestive of retrochiasmatic lesions. Characteristic abnormal responses included (1) very low amplitude or absent transient visual evoked potentials (T-VEPs) after stimulation of the affected hemifield, (2) reversal of normal pattern amplitude of the T-VEP distribution after stimulation of the affected hemifield, (3) abnormal lateral occipital ratio, (4) absent or very low amplitude steady-state VEPs after stimulation of affected hemifield, and (5) abnormal midoccipital ratio.
Kuroiwa Y, Celesia GG. Visual Evoked Potentials With Hemifield Pattern Stimulation: Their Use in the Diagnosis of Retrochiasmatic Lesions. Arch Neurol. 1981;38(2):86–90. doi:https://doi.org/10.1001/archneur.1981.00510020044005
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