One of the longstanding ISCEV goals is to establish worldwide standard clinical protocols for electrophysiological examinations. Based on input from many members, ISCEV has published the following compilations of protocols. Thankfully, Springer has made these public access; since access on their site is occasionally not working right we here also provide local copies.
Standards available for free only →here (scroll down to Society Guidelines/Standards).
Hood DC, Bach M, Brigell M, Keating D, Kondo M, Lyons JS, Marmor MF, McCulloch DL, Palmowski-Wolfe AM (2012) ISCEV Standard for clinical multifocal electroretinography (2011 edition). Doc Ophthalmol 124:1–13 mfERG Standard (free from Springer)
McCulloch DL, Marmor MF, Brigell MG, Hamilton R, Holder GE, Tzekov R, Bach M (2015) ISCEV Standard for full-field clinical electroretinography (2015 update). Doc Ophthalmol 130:1–12
Erratum: Table 1 in the above publication gives an incorrect number as the lower bandpass for dark-adapted OPs. The correct value is “75 Hz”, as correctly stated on page 8, 2nd paragraph. Erratum PDF (free from Springer)
[Erratum (switch to open access, correction of one axis label in a figure): Constable PA, Bach M, Frishman LJ, Jeffrey BG, Robson AG; International Society for Clinical Electrophysiology of Vision (2017) Erratum to: ISCEV Standard for clinical electro-oculography (2017 update). Doc Ophthalmol 134(2):155]
Bach M, Brigell MG, Hawlina M, Holder GE, Johnson MA, McCulloch DL, Meigen T, Viswanathan S (2013) ISCEV standard for clinical pattern electroretinography (PERG) – 2012 update. Doc Ophthalmol 126:1–7 [DOI]
Odom JV, Bach M, Brigell M, Holder GE, McCulloch DLL, Mizota A, Tormene AP (2016) ISCEV standard for clinical visual evoked potentials – (2016 update). Doc Ophthalmol 133(1):1–9VEP Standard (from Springer) [and since, due to some glitch, it's not free, here the PDF]
Brigell M, Bach M, Barber C, Moskowitz A, Robson J (2003) Guidelines for calibration of stimulus and recording parameters used in clinical electrophysiology of vision. Doc Ophthalmol 107:185–193
Robson AG, Nilsson J, Li S, Jalali S, Fulton AB, Tormene AP, Holder GE, BrodieSE (2018) ISCEV guide to visual electrodiagnostic procedures. Doc Ophthalmol 136:1–26.
doi: 10.1007/s10633-017-9621-y [PDF]
ISCEV approves Extended Protocols that specify rigorous procedures for applications such as non-standard diagnostic testing and clinical trials.