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. 2012 Apr 18;53(4):1852–1860. doi: 10.1167/iovs.11-9309

Figure 1.

Figure 1.

Schematic representations of the neuroretinal rim parameters. (A) Salient anatomical features of the optic disc margin in internally oblique border tissue (BT) configuration (left) where BT extends internally from the anterior scleral opening to fuse with BM and externally oblique BT configuration (right) where BT extends externally from the anterior scleral opening to fuse with BM. For simplicity, the retinal pigment epithelium is not shown. (B) Representation of DM-HRW, the distance from the projection (dm) of the DM from the optic disc photograph to the ILM in the DM reference plane (d). (C) Representation of BMO-HRW, the distance from BMO to the ILM in the BMO reference plane (b). (D) Representation of BMO-MRW, the minimum distance from BMO to the ILM irrespective of the plane. Horizontal rim width measurements (B and C) depend on the trajectory of the retinal nerve fiber layer at the point of measurement resulting in larger measurements when the trajectory is more horizontal (right compared with left).