In RGS9/R9AP-associated retinopathy subjects, the dark-adapted 0.01 electroretinogram (rod electroretinogram), the dark-adapted red flash electroretinogram (both an early cone and later rod system component), and the dark-adapted 3.0 electroretinogram (combined rod-cone standard flash electroretinogram; rod dominated given numerosity) with interstimulus interval of 2 minutes are all normal—all in keeping with the relatively intact cone and rod photoreceptor mosaic observed in our study. Here, RGS9 is linked to retinal disorder.