RHO and congenital stationary night blindness: Congenital stationary night blindness can be classified into 2 types based on electroretinographic findings1: (i) the Riggs type, which is much less prevalent, where there are reduced a- and b-waves in response to a scotopic bright flash; and (ii) the Schubert–Bornschein (S–B) type with selective loss of the b-wave.2, 3, 4 The Riggs type of congenital stationary night blindness (CSNB) has been associated with variants in GNAT1, PDE6B, RHO, and SCL24A1. 5, 6, 7, 8 The Schubert–Bornschein type of CSNB is characterized by signal transmission dysfunction between photoreceptors and bipolar cells.9