Figure 5. Energy-dispersive X-ray spectroscopy (EDS) analysis of dendrites in tear film showing peaks of the mass percentage of chloride
and potassium in camels, humans, and Refresh Plus lubricant. The tear samples were placed on nickel grids. The unlabeled peaks
are nickel (Ni) from the nickel grids. The labeling of the peaks from backgrounds, such as nickel grids, were excluded. ClKa
= Chlorine at Kα, FeKa = Iron at Kα, FeLa = Iron at Lα, K = Potassium, KKa = Potassium at Kα, KKb = Potassium at Kβ.