iridocorneal angle morphology trait canal of Schlemm morphology trait sinus venosus sclerae morphology trait Trait.ontology Fontana canal morphology trait circular sinus morphology trait Any measurable or observable characteristic related to the shape, structure, color or pattern of the vascular structure encircling the anterior chamber of the eye, through which the aqueous humor is returned to the blood circulation. Lauth canal morphology trait sinus circularis morphology trait scleral venous sinus morphology trait VT:0005204 venous sinus of sclera morphology trait Schlemm's canal morphology trait