Figure 4 of Shetty, Mol Vis 2015; 21:12-25.

Figure 4. LOX activity is reduced in tears from KC patients. LOX activity in tears from 30 control and 62 KC samples is represented as relative fluorescence units/ml (RFU/ml) in (A) the control versus KC (*: p = 0.016 for KC activity compared to controls); B) different clinical grades of KC.