Predicted to enable riboflavin binding activity; riboflavin transmembrane transporter activity; and signaling receptor activity. Predicted to be involved in riboflavin transport. Predicted to be located in interphotoreceptor matrix. Predicted to be extrinsic component of plasma membrane. Predicted to be anchored component of external side of plasma membrane. Orthologous to human RTBDN (retbindin). [provided by Alliance of Genome Resources, Apr 2022]