Table 2.

Comparisons of ONH parameters in different astigmatism groups ($\overline{\mathbf{x}}\pm s$)

	Normal astigmatism group	High corneal astigmatism group	P*
Disc area	1.70 (0.32)	1.95 (0.58)	0.030
Rim area	1.25 (0.30)	1.44 (0.34)	0.019
Vertical C/D ratio	0.44 (0.13)	0.41 (0.18)	0.423
Average C/D ratio	0.48 (0.13)	0.44 (0.16)	0.374
Cup volume	0.096 (0.09)	0.097 (0.10)	0.970

*Independent t-test, ONH indicates optic nerve head, C/D indicates ratio cup-to-disk.