Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
The electroretinogram (ERG) is a useful diagnostic tool in differentiation of various ocular diseases in small animals. The ERG recording is not a true measure of vision but is a measure of the functional integrity of the outer retinal layers and of the pigment epithelium. When the retina is suddenly illuminated with a light source of high intensity and very short duration a complex photo-chemical response is initiated.
Carter, James D.
"Clinical Use of Electroretinography,"
Iowa State University Veterinarian: Vol. 31
, Article 3.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol31/iss3/3