“…43 The standard full-field electroretinogram (ERG), which is predominately driven by the outer retina, is generally not helpful in the diagnosis or treatment of glaucoma, especially PACG, in which the IOP increase may be very sudden. 43–45 If IOP is very high, the full-field ERG may be extinguished, and although this has negative prognostic significance, in the authors’ experience it is still possible for vision to be temporarily regained once IOP returns to normal and adequate perfusion to the retina is returned. 24,43–45 …”