retinoid metabolic process aldehyde metabolic process retinal metabolic process GO:0042574 retinal metabolism biological_process retinaldehyde metabolism retinaldehyde metabolic process The chemical reactions and pathways involving retinal, a compound that plays an important role in the visual process in most vertebrates. In the retina, retinal combines with opsins to form visual pigments. Retinal is one of the forms of vitamin A. olefinic compound metabolic process