Fig. 22. Proposed mechanism of pressure reduction after nonpenetrating filtration surgery. The red arrows indicate inhibition of aqueous flow at the trabecular meshwork. The yellow arrow designates the passage of aqueous from the anterior chamber through the gossamer thin trabeculodescemet's membrane into the intrascleral cavern (blue area). The potential sites for egress of aqueous include Schlemm's canal and its collector system (green arrow 1), transscleral flow (green arrow 2), and uveoscleral flow (green arrow 3).