In COL9A1-related autosomal recessive Stickler syndrome, the vitreous does not phenocopy the classic type 1 Stickler syndrome (COL2A1; membranous vitreous) or type 2 Stickler syndrome (COL11A1; beaded vitreous) patterns. This evidence concerns the gene COL9A1 and Stickler syndrom, recessive.