ERG or VEP?

Often blindness is associated in neuro metabolic diseases apart from hyperbarix oxygen damage in new borns to ocular infection s.

We follow retina assessment protocol for suspected retinal detachment in nicu or ventilator graduates..

For optic atrophy no obvious tests but a repeat check after three months following a heavy dose steroids helps doc call it irreversible.

In extensive retinal disease both ERG that is electroretinogram and VEP are likely to be abnormal.
In retinitis pigmentosa as in storage diseases ERG may be affected though VEP may be preserved.

Vice versa in macular degeneration VEP is affected and ERG May be intact.

For diseases like galactosemia and wilsons monitoring lens ofr cataract is important so is in steroid toxicity.