The absolute value of the average interocular latency difference of the multifocal visual evoked potential (mfVEP) is shown for individual eyes (symbols) of the control (n = 50 individuals), glaucoma (n = 50), retinal disease (RD) (n = 15), and optic neuritis/multiple sclerosis (ON/MS) (n = 12) groups. The box plot shows the 25% to 75% range (box), the 5% to 95% range (vertical line), and the mean of the group (horizontal bar).