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A: Before intra-stromal corneal ring implantation, (before 1st step-ISCR) treatment for keratoconus; B: After intra-stromal corneal ring implantation, (before 2nd step-ISCR) treatment for keratoconus, showing significant improvement; C: After TG-PRK/CXL, ( 2nd step-ISCR) treatment for keratoconus, showing significant improvement.
