• 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 StimulationTheir Use in the Diagnosis of Retrochiasmatic Lesions. Arch Neurol. 1981;38(2):86–90. doi:10.1001/archneur.1981.00510020044005