Figure 1 of Diego, Mol Vis 2016; 22:1095-1102.

Figure 1. Fluorescein staining of the cornea. After staining with fluorescein, the corneal surface was imaged using a cobalt blue filter fitted to a slit-lamp microscope. Images were taken on day 4 of treatment. A: Normal eye control group without evidence of corneal surface damage. B: Dry eye group with fluorescein staining indicating corneal surface damage (dotted circle).