The oscillatory potential of the human electroretinogram is present most prominently when an intense white stimulus is used. This component of the ERG is distinct from the a-, b-photopic and b-scotopic components and each of these components is relatively selectively affected by disease states. Most strikingly in diabetes the oscillatory potential is markedly reduced while the other components are normal.
Jacobson JH, Hirose T, Popkin AB. Oscillatory Potential of the Electroretinogram: Relationships to the Photopic b-Wave in Humans. Arch Ophthalmol. 1967;78(1):58-67. doi:10.1001/archopht.1967.00980030060012