Review Article
Corneal Collagen Cross-Linking for Keratoconus: Systematic Review
Table 2
Risk of bias in included studies.
| | Study (year) | Random sequence generation (selection bias) | Allocation concealment (selection bias) | Blind participants and personnel (performance bias) | Blind outcome assessment (detection bias) | Incomplete outcome data (attrition bias) | Selective reporting (reporting bias) |
| | Greenstein [16] (2011) | Low | Low | High | Unclear | Unclear | Unclear | | O’Brart [17] (2011) | Low | Low | High | Low | Low | Unclear | | Wittig-Silva [18] (2014) | Low | Low | High | High | High | High | | Lang [19] (2015) | Low | Low | High | Unclear | Low | Unclear | | Seyedian [20] (2015) | Low | Low | High | Unclear | Low | Unclear |
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First author.
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