1. The Scotopic ERG Response A 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

2. The Scotopic ERG Response A 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

3. Multifocal electroretinogram (mfERG): http://www.webvision.utah.edu records focal responses from several locations in retina simultaneously primarily tests middle and outer retinal layers

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

5. Advances in imaging techniques Gerth CR, Zawadski RJ, Warner JS and Heon E (2008).