Retinol dehydrogenase with a clear preference for NADP. Converts all-trans-retinol to all-trans-retinal. all-trans-retinol + NADP(+) = all-trans-retinal + H(+) + NADPH Cofactor metabolism; retinol metabolism. Detected in retina, entire eyecups and in liver (at protein level). Belongs to the short-chain dehydrogenases/reductases (SDR) family.