Parameters  | 
        POAG ( n = 65)  | 
       
      
        Latency time (r value)  | 
        P   | 
        Amplitude (r value)  | 
        P   | 
       
      
        Central    retinal artery  | 
           | 
           | 
           | 
           | 
       
      
        PSV  | 
        −0.068  | 
        0.479  | 
        0.210  | 
        0.340  | 
       
      
        EDV  | 
        −0.100  | 
        0.458  | 
        0.232  | 
        0.164  | 
       
      
        RI  | 
        0.165  | 
        0.331  | 
        −0.360  | 
        0.248  | 
       
      
        Ophthalmic    artery  | 
           | 
           | 
           | 
           | 
       
      
        PSV  | 
        −0.323  | 
        0.053  | 
        0.240  | 
        0.163  | 
       
      
        EDV  | 
        −0.015  | 
        0.820  | 
        0.053  | 
        0.634  | 
       
      
        RI  | 
        0.354*  | 
        0.003  | 
        −0.424*  | 
        0.015  | 
       
      
        Short    posterior ciliary artery  | 
           | 
           | 
           | 
       
      
        PSV  | 
        −0.248  | 
        0.164  | 
        0.051  | 
        0.656  | 
       
      
        EDV  | 
        −0.164  | 
        0.251  | 
        0.121  | 
        0.323  | 
       
      
        RI  | 
        0.324  | 
        0.053  | 
        0.016  | 
        0.527  | 
       
     
      POAG= primary open angle glaucoma, OA= ophthalmic artery, CRA= central
    retinal artery, SPCA= short posterior ciliary artery, PSV= peak systolic velocity,
    EDV= end-diastolic velocity, RI= resistive index *P < 0.05 |