Plays an important role in retinal cone photoreceptor survival (PubMed:25957687). In association with glucose transporter SLC16A1/GLUT1 and BSG, promotes retinal cone survival by enhancing aerobic glycolysis and accelerating the entry of glucose into photoreceptors (PubMed:25957687). May play a role in cone cell viability, slowing down cone degeneration, does not seem to play a role in degenerating rods (PubMed:15220920). Interacts with isoform 1 of BSG. Expressed in the retina (at protein level) (PubMed:15220920, PubMed:19843539). Expressed predominantly by photoreceptors in both the inner and outer nuclear layer (at protein level) (PubMed:15220920, PubMed:19843539). Not expressed in the testis, spleen, intestine, lung, cerebellum, or kidney (PubMed:15220920). Belongs to the nucleoredoxin family.