Human tears have attracted attention with easy-accessible indicators of healthcare
monitoring. Recently self-monitoring of tear glucose in place of blood glucose has been
developed with microfluidic paper-based analysis for a non-invasive diagnosis of diabetes.
However, most previous works still have many limitations in unstable sample collection, low
sensitivity, and insufficient sample volume. Here, we report a colorimetric Schirmer strip with
preconcentration for tear glucose detection. A wax barrier on a paper strip enables tear …