Retina-specific kinase involved in the signal turnoff via phosphorylation of rhodopsin (RHO), the G protein- coupled receptor that initiates the phototransduction cascade (PubMed:15946941). This rapid desensitization is essential for scotopic vision and permits rapid adaptation to changes in illumination (By similarity). May play a role in the maintenance of the outer nuclear layer in the retina (By similarity). {ECO:0000250|UniProtKB:Q9WVL4, ECO:0000269|PubMed:15946941}. This is the function of GRK1 (G protein-coupled receptor kinase 1, ENSG00000185974).