Chondroitin sulfate- and hyaluronan-binding proteoglycan involved in the organization of interphotoreceptor matrix; may participate in the maturation and maintenance of the light-sensitive photoreceptor outer segment. Binds heparin. Expressed in the retina (at protein level) (PubMed:10702256, PubMed:29777959). Expressed by photoreceptors of the interphotoreceptor matrix (IPM) surrounding both rods and cones (at protein level) (PubMed:10542133, PubMed:29777959). IPM occupies the subretinal space between the apices of the retinal pigment epithelium and the neural retina (PubMed:10542133). Expressed in the pineal gland (at protein level) (PubMed:10702256). Expressed in the retina 17 weeks post-conception (at protein level) (PubMed:29777959). Expressed in the outer neuroblastic zone and retinal pigment epithelium (at protein level) (PubMed:29777959). Highly glycosylated (N- and O-linked carbohydrates). The disease is caused by variants affecting the gene represented in this entry. The disease is caused by variants affecting the gene represented in this entry.