Table 1 lists the median with 95% CI of the variables reported by ORA and Corvis-ST. The number of eyes was 59, 57, and 83 in healthy, PACG, and POAG groups, respectively. Based on GAT-IOP, the minimum total sample size needed to achieve a type I/II error of 0.05/0.2 was 21. Thus, the study sample size was adequate. From
Table 1, age (
P = 0.96) and CCT (
P = 0.37) were similar among the groups (
P = 0.96). From
Table 1, median GAT-IOP of PACG (16 mm Hg,
P = 0.002) and POAG (15 mm Hg,
P = 0.002) groups was significantly higher than the healthy group. IOPg of PACG was significantly higher than IOPg of POAG (17.6 mmHg,
P = 0.003) and healthy (
P = 0.003) group. Further, median IOPcc of PACG (
P < 0.0001) and POAG (17.2 mm Hg,
P < 0.0001) was significantly higher than the healthy eyes group. Median Corvis-ST IOP of healthy was similar to Corvis-ST IOP of POAG (16.5 mm Hg,
P > 0.05) but lower than Corvis-ST IOP of PACG (16.75 mm Hg,
P = 0.02). Among all the IOPs, IOPcc achieved the greatest statistically significant difference among the groups (
P < 0.0001) and was used for further analysis.
Figure 1 shows a comparison of all the IOP's of the different groups. From
Table 1, the CH of PACG (8.2 mm Hg,
P < 0.0001) and POAG (7.7 mm Hg,
P < 0.0001) groups was significantly lower than the CH of healthy group. Similarly, the median CRF of PACG (9.0 mm Hg,
P < 0.0001) and POAG (8.4 mm Hg,
P < 0.0001) groups was significantly lower than the CRF of healthy eyes group. These trends are shown in
Figure 2. However from
Table 1, median DA of PACG (1.05 mm) was significantly lower than POAG (1.1 mm,
P = 0.04) and was similar to healthy eyes (
P > 0.05).
Figure 3 shows the trend in DA among the groups. The mean spherical equivalent refractive error was −0.12 ± 0.19 D and +0.57 ± 0.29 D in the POAG and PACG group, respectively (
P = 0.04). The healthy eyes had no refractive error.