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Relations among measurements of RNFL birefringence, macular blood flow velocity, and microvascular density. The average birefringence and birefringence in the inferior quadrant were not related to axial length (a), refraction (b), blood flow velocities (c) and macular vessel densities (d) (r ranged from − 0.09 to 0.19, P > 0.05). SVD: superficial vascular density; DVD: deep vascular density
