Figure 2: A: Horizontal mattress suture bites before tying in a solid silicone segmental buckle as seen on the scleral surface. The suture bites are spread the width plus two times the thickness of the buckle element. B: Cross-section illustration of the same segmental buckle on the surface of the sclera before the mattress suture is tied to indent the sclera. C: The horizontal mattress suture has been tied with ideal buckling effect; the buckle is flush with the scleral surface.