VEP latency of 30 msec or maybe more is frequently indicative of retrobulbar neuritis rather then PION [20]. PION is a lot more more likely to cause a discount in amplitude of VEP and is much more more likely to be everlasting and irreversible variations as compared with optic neuritis. https://daftarpion78609886.dailyhitblog.com/31561286/what-does-pion786-mean