Enzymatic deficiency of O-Fucose-specific β-1,3-N-glucosyltransferase (B3GALTL, sometimes referred to as B3GLCT or B3GTL) [OMIM:261540], also known as Peters plus syndrome, is a rare AR disorder that presents with syndromic developmental defects mostly affecting the eye. The gene discussed is B3GLCT; the disease is Peters plus syndrome.