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Figure 4: UVA irradiation alone did not enhance Young’s modulus of cornea in epithelium-on (1.00 ± 0.09 mpa) or epithelium-off (0.94 ± 0.21 mpa) groups compared with those in control group (1.03 ± 0.24 mpa). The UVA irradiation combined with riboflavin significantly increased Young’s modulus of cornea in epithelium-on (1.23 ± 0.23 mpa) or epithelium-off (1.42 ± 0.16 mpa) groups compared with those in control group ( ). Young’s modulus of cornea in UVA+rib+nonepi group is 15.4% higher than that in UVA+rib+epi group ( ). Asterisk denotes significant difference with control group, unless otherwise specified.