Figure 7. Multifocal electroretinography (left panel) and overlay of multifocal electroretinography focal responses on fundus autofluorescence photography (right panel) in the 33-year-old female carrier of X-linked retinitis pigmentosa whose fundus is presented in Figure 6. Patchy retinal dysfunction compatible with random X inactivation, and a patchy variability in fundus autofluorescence intensity is demonstrated. Areas of remaining autofluorescence seem to correspond to areas of remaining responses by multifocal electroretinography. The following abbreviations apply: ms is short for millisecond and nV is short for nanovolt.