SAG and vitamin A deficiency: This symptomatology is also characteristic of vitamin A deficiency [84], congenital stationary night blindness (CSNB) [85], Oguchi disease [86,87] or RP, diseases that are directly linked to the malfunction of Arrestin-1 and GRK1 [75,78,86,88], and Rhodopsin and Transducin-α [85,89,90].