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Non-penetrating filtering surgeries do not penetrate or enter the eye's anterior chamber . There are two types of non-penetrating surgeris: Bleb-forming and viscocanalostomy . Bleb forming procedures include ab externo trabeculectomy and deep sclerectomy. Ab externo trabeculectomy (AET) involves cutting from outside the eye inward to reach Schlemm's canal, the trabecular meshwork, and the anterior chamber.
Also known as non-penetrating trabeculectomy (NPT), it is an ab externo (from the outside), major ocular procedure in which Schlemm's canal is surgically exposed by making a large and very deep scleral flap. The inner wall of Schlemm's canal is stripped off after surgically exposing the canal . Deep sclerectomy, also known as nonpenetrating deep sclerectomy (PDS) or nonpenetrating trabeculectomy is a filtering surgery where the internal wall of Schlemm's canal is excised, allowing subconjunctival filtration without actually entering the anterior chamber ; it is commonly performed with the Aquaflow? collagen wick .
Viscocanalostomy is also an ab externo, major ocular procedure in which Schlemm's canal is surgically exposed by making a large and very deep scleral flap. In the VC procedure, Schlemm's canal is cannulated and viscoelastic substance injected (which dilates Schlemm's canal and the aqueous collector channels)
Fig. Each letter has not only been seen separately, but it has been demonstrated in the chapter on "Shifting and Swinging" must also be numbered among the illusions of normal sight, and so must the perception of 182 Illusions of Imperfect and Normal Sight objects in an upright position. Now I do not; I welcome them. Even in these cases, too, the treatment can be continued with benefit; for it is impossible to place limits to the visual powers of man, and no matter how good the sight, it is always possible.
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