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Measuring the diameter of the optic nerve head in the healthy brown Norway rat. (A) Radial scans were acquired around the optic nerve and BMO was manually annotated (white points) for each B-scan (n = 24 radial scans). (B) Bruch's membrane opening annotations are plotted (white points) on top of the scanning laser ophthalmoscopy image. The optic nerve head diameter was measured from a circle fit (black circle) through BMO annotations.
