Tear serotransferrin quantitative analysis
To validate the glycomic results, tears from the 7 AKC and 7 VKC patients, and from 7 CTRL were used to measure tear concentrations of serotransferrin by the commercial quantitative immunochemical analysis (Dimension Vista System, Siemens, Erlangen, Germany) (Limit of Detection (LOD) is 0.002 mg/L).