Document Type

Journal Article

Date of this Version


Publication Source

Compendium on Continuing Education for the Practicing Veterinarian





Start Page

355-366, 399


Electroretinography, a technique that objectively assesses the function of the retina, is used to evaluate the progression of retinal disorders. Part I of this two-part presentation discussed the morphologic and physiologic characteristics of the retina. The information presented in Part II can help practitioners determine when an electroretinogram (ERG) is recommended. In addition to the standard flash ERG, visual evoked potentials (VEPs) are useful for evaluating disorders that lead to blindness.

The most common indications for electroretinography are presurgical evaluation of patients with cataracts, characterization of disorders that cause blindness, and identification of the extent of retinal damage caused by glaucoma. A flash ERG can only show changes that occur to the retina in advanced stages of glaucoma; whereas a pattern ERG (PERG) can record early, selective damage to ganglion cells in the retina.


Dr. Komáromy was affiliated with the University of Pennsylvania from 2003-2012.

Pages 360-361 contained full page advertisements and have been removed. Blank pages were inserted to reflect pagination.

Part I can be found at



Date Posted: 20 November 2013

This document has been peer reviewed.