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Figure 4: During endoscopic ONDd, once the optic nerve bulge is identified (a), the bone is drilled. Then, sheath is cut from medial to lateral direction, at the superior border, to avoid inadvertent injury to ophthalmic artery. We use sharp endoscopic sickle-shaped knife and cut the sheath in a single stroke from medial to lateral (b) direction. After CSF egress is complete, the oxidized cellulose is kept on the defect for the hemostasis and to facilitate fibroblast growth (c)

Figure 4: During endoscopic ONDd, once the optic nerve bulge is identified (a), the bone is drilled. Then, sheath is cut from medial to lateral direction, at the superior border, to avoid inadvertent injury to ophthalmic artery. We use sharp endoscopic sickle-shaped knife and cut the sheath in a single stroke from medial to lateral (b) direction. After CSF egress is complete, the oxidized cellulose is kept on the defect for the hemostasis and to facilitate fibroblast growth (c)