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. 2016 Apr 13;10(1):3–4. doi: 10.1016/j.optom.2016.03.002

Figure 1.

Figure 1

Melatonin amount in human tears at different moments of the day. The morning (8 h) concentrations were (0.81[0.60, 0.99] μM (10–3 mol/L)), afternoon (15 h) concentrations were (0.94 [0.69, 1.40] μM) and night (24 h) concentrations were (1.67 [1.18, 3.25] μM) (medians and quartiles). Differences discussed in the text.