eye morphology trait sclera morphology trait tunica sclerotica morphology trait tunica albuginea oculi morphology trait sclerotic coat morphology trait Trait.ontology Any measurable or observable characteristic related to the shape, structure, color or pattern of the fibrous, outer envelope of the eyeball, covering it entirely excepting the segment covered anteriorly by the cornea. sclerotica morphology trait VT:0002698