The Scotopic ERG ResponseA dim flash of light below the sensitivity threshold for cone photoreceptors stimulates only the rods in a dark adapted eye. An electrode placed on the cornea records the changing electrical potentials of the cells in the retina.http://www.iscev.org/standards/index.html

The Scotopic ERG ResponseA flash of light stimulates both rod and cone photoreceptorsin a dark adapted eye. An electrode placed on the cornea records the changing electrical potentials of the cells in the retina.http://www.iscev.org/standards/index.html

Multifocal electroretinogram (mfERG):

http://www.webvision.utah.edu

records focal responses from several locations in

retina simultaneously primarily tests middle and outer retinal layers

http://www.iscev.org/standards/index.html

Advances in imaging techniques

Gerth CR, Zawadski RJ, Warner JS and Heon E (2008).