Inhibits angiogenesis in the vitreous humor of the eye, and therefore represses neovascularization (By similarity). Binds collagen fibrils (By similarity). May be involved in collagen fiber organization via regulation of other members of the small leucine-rich repeat proteoglycan superfamily (By similarity). Homodimer. Ocular tissues, cartilage, ligament, skin, muscle and testes. O-glycosylated. Proteolytically cleaved by MMP1, MMP2, MMP3, MMP7, MMP8, MMP9, ADAMTS4, and ADAMTS5 (By similarity). Proteolytically cleaved by MMP13 (By similarity). Sulfated on tyrosine residues. Belongs to the small leucine-rich proteoglycan (SLRP) family. SLRP class III subfamily.