Riggs-type dominant congenital stationary night blindness: ERG findings, a new GNAT1 mutation and a systemic association.

Our family's ERG showed essentially no rod response, consistent with a Danish GNAT1 pedigree but different from the Nougaret GNAT1 pedigree that shows partial preservation of rod signal. A genetic connection between CSNB and POST would be intriguing, but we found no evidence for this.