Table 2.

Comparison of CAT, GSH, SOD and MDA values in keratoconus stages.

	CAT (U/L)	GSH (mmol/ml)	SOD (U/L)	MDA (mmol/L)
Stage 1	0.076 ± 0.001	0.003 ± 0.001	1.565 ± 0.016	1.683 ± 0.026
Stage 2	0.076 ± 0.001	0.002 ± 0.001	1.561 ± 0.024	1.697 ± 0.066
Stage 3	0.075 ± 0.001	0.002 ± 0.001	1.564 ± 0.013	1.694 ± 0.019
Stage 4	0.076 ± 0.002	0.001 ± 0.000	1.550 ± 0.000	1.700 ± 0.049
P Value	0.96	0.23	0.46	0.44

CAT Catalase, GSH Reduced glutathione, SOD Superoxide dismutase, MDA Malondialdehyde.