We report an abnormal electroretinogram with a negative configuration in a child who presented with moderate myopia, nystagmus, and visual developmental delay. We investigated the electroretinogram and explored the possibility of a metabotropic glutamate receptor subtype 6 mutation in six family members spanning four generations.
Vision Science Laboratory, The Children's Mercy Hospital, University of Missouri-Kansas City School of Medicine, Kansas City, Missouri 64108-9898, USA. kfitzgeral@cmh.edu