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Keratoconus affecting young population is a progressiveeye disease. This disease may remain silent untilcomplain of visual impairment is appeared. By using thehigh-quality imaging techniques disease now can be diagnosedearlier. The goal of keratoconus treatment is toimprove visual acuity and to prevent the progression ofthe disease. Although the previous treatment methods initiallyprovided slightly improvement of visual acuity, couldnot prevent keratoconus progression. However, collagencross-link (CCL) treatment both halts the progression ofthe disease and provides an increased vision. Since theside effect of the treatment is less and implementation iseasier, CCL provides an important advantage for thesepatients and this technique becomes common day by day.Key words: Keratoconus, cross-linking, cornea.