The function of Ensembl gene identifier ENSG00000128617 (OPN1SW, opsin 1, short wave sensitive) is as follows. G protein-coupled photoreceptor that selectively activates G(i) proteins in response to short-wavelength (blue-violet) light, thereby decreasing intracellular cAMP levels (PubMed:2937147, PubMed:6140680, Ref.10). Activation occurs when the opsin-bound cis- retinal chromophore absorbs a photon and isomerizes to all-trans- retinal, inducing a conformational change in the opsin that triggers a G protein-mediated phototransduction cascade (Ref.10). Required for the maintenance of cone outer segment organization in the ventral retina, but not essential for the maintenance of cone photoreceptor function (By similarity). Involved in ensuring the correct abundance and localization of retinal membrane proteins (By similarity). Mediates visual perception of blue light (PubMed:1386496, PubMed:1531728, PubMed:23022137). May contribute to increased spectral sensitivity under dim light conditions (By similarity). Is not UV-sensitive (By similarity). {ECO:0000250|UniProtKB:D5H3X0, ECO:0000250|UniProtKB:P51491, ECO:0000269|PubMed:1386496, ECO:0000269|PubMed:1531728, ECO:0000269|PubMed:23022137, ECO:0000269|PubMed:2937147, ECO:0000269|PubMed:6140680, ECO:0000269|Ref.10}.