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. 2002 Sep;86(9):981–984. doi: 10.1136/bjo.86.9.981

Figure 2.

Figure 2

OPA values of the four groups: POAG, NTG, OHT, and control. Group comparisons demonstrate a statistically significant lower OPA in the group of patients suffering from NTG compared to each of the other groups (p = 0.01). * indicates a p value <0.05, ** indicates a p value <0.01.