Non penetrating glaucoma surgery glaucoma surgery can be broadly categorised into penetrating pgs trabeculectomy and non penetrating npgs techniques npgs avoids entering the anterior chamber thereby reducing the incidence of hypotony related complications bleb associated problems as well as serious complications like endophthalmitis resistance to aqueous outflow is provided by the trabecular meshwork and descemets membrane offering better control over aqueous drainage . 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 the inner wall of the schlemms canal was untouched and the conjunctiva was closed however sinusotomy never became popular because it was a difficult operation it needed a surgical microscope and the schlemms canal had to . Non penetrating glaucoma surgery npgs is selectively used on the altered structures responsible for ocular hypertension it is performed without penetrating the eye bulb and different to other widely used techniques it is essentially extraocular surgery in this way the surgeon avoids the possible complications associated with penetrating . Video showing the technique of npgs using regular instruments difficulties like micro perforation macro perforation and searching for the canal of schlemm
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