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. Author manuscript; available in PMC: 2009 Oct 1.
Published in final edited form as: Vision Res. 2008 Sep 16;48(23-24):2425–2432. doi: 10.1016/j.visres.2008.07.016

Figure 2.

Figure 2

Standard ISCEV (International Society for Clinical Electrophysiology of Vision) protocol ERGs obtained over a 12-year-period of follow-up in patient # 4940. A, The ISCEV standard rod response. B. The standard combined (rod and cone) ERG response. C. The cone response to a 30 Hz flickering stimulus. D. The cone response presented in the presence of a rod-saturating background. Typical of patients with CD, rod responses remain fairly stable over the follow-up period, while cone responses show considerable progression.