,

Electronegative ERG

  • Loss of “b” wave in a dark adapted mixed rod-cone response


from AAO EyeWiki ERG

Possible Causes

  • CSNB (Oguchi’s)
  • CRVO / acute CRAO
  • X-linked retinoschisis
  • Siderosis
  • Myotonic dystrophy
  • Duschenne muscular dystrophy
  • Batten disease
  • Quinine toxicity / methanol toxicity
  • MAR (melanoma-associated retinopathy / CAR (cancer-associated retinopathy)
  • Retinoschisis