In 6 rabbits which had been submitted to a seton operation 2--6 months previously, the mode of aqueous outflow has been documented photographically after injection of fluorescein into the anterior chamber. In all 6 cases the catheter allowed direct passage of aqueous humour through its lumen into the subconjunctival space; further sources of diffuse aqueous egress were provable at the site of the corneo-slceral wound, either next to the catheter or aside from it. Additional drainage via preformed channels occurred through lymphatic vessels as well as through secondary aqueous veins.
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