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Phase retardation per unit depth (PR/UD, proportional to birefringence) measurements from radial area and ring scans for subject 57204 were averaged together within its respective angular section around the (ONH) and superimposed on (A) mean (Ax) modes for subject 57204 and (B) mean (Aa) and (Ax) modes for subject 1853 measured in corresponding regions of the same eye. N, nasal; T, temporal; S, superior; I, inferior
