Conventional Non-Penetrating Deep Sclerectomy Versus Modified Subflap Mattress Suture in OAG

Up until the deep scleral flap was removed, this method was identical to the conventional NPDS. Applying a mattress suture beneath the superficial scleral flap was the next step. The superficial flap was sutured with a 10/0 nylon (Alcon®) that extended 1 mm beyond its outside edges. The methodology originally described by Abdel Rahman and Habib was followed by the placement method. The initial step in introducing the suture into the sclera was to line it with the left boundary of the superficial scleral flap and to do it in an anteroposterior manner. This was done 2 mm outside the flap. After that, it was moved horizontally under the flap again until it reached the right border. Then, it was threaded postero-anteriorly, 2 mm laterally to the right flap edge. Then, using McPherson forceps, the suture was fastened in a mattress configuration, with one limb placed near Schlemm's canal.

The conjunctiva was made more visible by placing a 7/0 Vicryl corneal traction suture in the superior cornea. Wescott scissors were used to excise a 10 mm fornix-based conjunctival flap, and minimum diathermy was used to achieve haemostasis. Using a super blade, a 4 mm x 4 mm superficial scleral flap was made. Then, a crescent knife was used for anterior dissection to a depth of around 50% of the scleral thickness, exposing the top 2 mm of the transparent cornea. Under the scleral flap in the subconjunctival area, mitomycin-C (MMC®) sponges were positioned at a concentration of 0.2 mg/mL and moved towards the upper fornix. They were kept in place for 2 minutes. A balanced salt solution, volume 50 mL, was used for irrigation purposes. The scleral spur was located by dissecting a deep scleral flap that began at the superficial flap's perimeter and continued to a depth equal to 90% of the thickness of the scleral bed. To expose the trabecular meshwork (TDM), the roof of Schlemm's canal wa