Electroretinograms according to the protocol recommendations by the International Society for Clinical Electrophysiology of Vision (ISCEV)8, 9 also do not allow for the distinction to be made between RGS9/R9AP-associated retinopathy and oligocone trichromacy, with more comprehensive electroretinograms than those mandated by the ISCEV in the electroretinogram standard document being needed. This evidence concerns the gene RGS9 and retinal disorder.