iridocorneal angle morphology trait canal of Schlemm 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. Fontana canal morphology trait Lauth canal morphology trait Schlemm's canal morphology trait Trait.ontology VT:0005204 circular sinus morphology trait scleral venous sinus morphology trait sinus circularis morphology trait sinus venosus sclerae morphology trait venous sinus of sclera morphology trait