Known collectively as non penetrating glaucoma surgery or npgs most of these procedures attempt to improve or re establish the eyes natural drainage system without the creation of a bypass and development of a post operative bleb as seen with traditional filtering surgeries. While most patients are managed with topical treatment some will require surgery non penetrating glaucoma surgery glaucoma surgery can be broadly categorised into penetrating pgs trabeculectomy and non penetrating npgs techniques. The concept of non penetrating glaucoma surgery npgs originated in 1964 when krasnov published his first report on sinusotomy 1 this operation consisted of removing a lamellar band of the sclera opening the schlemms canal over 120o from 10 to two oclock. Success of iop control over time following non penetrating glaucoma surgery the symbols represent reported results of separate studies as identified by their principal investigators there is a trend towards diminished iop control over time as illustrated
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