electroretinogram

initialism: ERG
https://doi.org/10.1351/goldbook.11748
Recording, with electrodes placed on the cornea or nearby skin, of the electrical activity of photoreceptors and other retinal cells in response to standardized, patterned stimuli with light and colour.
Source:
PAC, 2015, 87, 841. (IUPAC Glossary of terms used in neurotoxicology (IUPAC Recommendations 2015)) on page 865 [Terms] [Paper]