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Increased episcleral vessel density was correlated to higher IOP (A; r = 0.45, P < 0.01) and C/D ratio (B; r = 0.54, P < 0.01). Increased episcleral vessel diameter index was correlated to higher IOP (C; r = 0.56, P < 0.01) and C/D ratio (D; r = 0.65, P < 0.01).