CACNA1F and Cone rod dystrophy: Type 2 CSNB with an X-linked pattern of inheritance (CSNB2A) is the single most common form of CSNB, attributable to mutations in a single gene—CACNA1F.1,9–11 (CSNB2A has also been referred to as Åland eye disease, incomplete CSNB, and X-linked cone-rod dystrophy 3.