KCNV2 and retinal disorder: Genetic testing strategies and their accessibility also differ among countries: those in which targeted restricted gene panels are used selectively in patients with recognizable phenotypes could lead to a greater reported prevalence of those genes (for example, possibly contributing to the higher prevalence of KCNV2 retinopathy, which has a pathognomonic electroretinography phenotype,28 in the United Arab Emirates study).10