A tube for implantation into the eye for replacement conduction of
aqueous humor from the chambers of the eyeball to the subconjunctival tissue and ultimately to the venous
system is comprised of an elongated fluid conducting conduit having distal and
proximate ends, a sidewall and an interior passageway and at least one longitudinally extending opening in the sidewall that exposes the interior passageway and at least one nidi-forming structure carried by the conduit and extending laterally therefrom to implement the formation of at least one aqueous
filtration bleb in the tissue of the eyeball. In one embodiment, the tube also contains at least one releasable
ligature circumscribing the conduit. In another embodiment, the tube also contains an anchor appended to the conduit to prevent it from migrating from its placement site.