Fig. 2. A. Windows are cut in the scleral covering of the hydroxyapatite implant. B. The implant is inserted within Tenon's fascia. C. The four recti muscles are sutured to the sclera, each in the region of a previously cut window. D. Tenon's fascia has been imbricated over the implant, and the conjunctiva is being undermined to the fornices.