Table 2. Young’s modulus (E; MPa; M±SD) obtained for each sample before and after cross-linking.

	E values before riboflavin/UV-A cross-linking					E values before glutaraldehyde cross-linking
Approah speed (μm/s)	Cornea 1	Cornea 2	Cornea 3	Cornea 4	Cornea 5	Cornea 6	Cornea 7
1.7	1.48±0.17	2.80±0.22	1.14±0.20	2.87±0.12	4.77±0.79	1.28±0.13	5.38±0.21
3.5	1.68±0.20	3.01±0.23	1.15±0.36	3.41±0.16	6.09±1.04	2.00±0.14	6.59±0.06
8.2	2.02±0.20	3.48±0.32	1.48±0.48	4.49±0.32	7.94±1.00	3.29±0.02	9.38±0.62
12.3	2.22±0.29	3.78±0.36	2.27±0.47	5.34±0.55	10.19±1.06	4.10±0.07	10.88±1.25
	E values before riboflavin/UV-A cross-linking					E values before glutaraldehyde cross-linking
Approach speed (μm/s)	Cornea 1	Cornea 2	Cornea 3	Cornea 4	Cornea 5	Cornea 6	Cornea 7
1.7	2.21±0.42	3.26±0.20	1.62±0.34	3.82±0.37	7.46±0.15	5.10±0.18	10.81±0.36
3.5	2.54±0.29	3.59±0.14	1.63±0.33	4.12±0.32	9.11±0.21	5.61±0.17	11.50±1.26
8.2	2.98±0.62	4.03±0.18	2.13±0.41	4.69±0.18	12.44±0.50	6.31±0.01	11.39±1.23
12.3	3.28±0.59	4.21±0.32	2.77±0.40	5.14±0.13#	16.09±1.19	7.00±0.01	12.20±0.85

*P<0.05 between the pre- and post-treatment states (except for ^#)