Congenital Stationary Night Blindness Type 1 Subtype B

"An abnormal sub-type of congenital stationary night blindness (CSNB), a heterogeneous class of rare genetic conditions affecting bipolar cells, photoreceptor cells, and the retinal pigment epithelium (RPE). An abnormal inner plexiform layer characterizes CSNB Type 1 subtype B despite showing a normal fundus appearance. Further, a b-wave is not recorded on the electroretinogram."