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Evaporative contribution to tear loss at different relative humidity (RH) conditions (40%–45% and 20%–25%). The contribution of evaporation to total aqueous tear loss in dry eye patients, either with (10 patients) or without (8 patients) meibomiam gland dysfunction (MGD), when compared to 11 normal subjects did not reach statistical significance. Error bars represent the standard error of the mean. KCS = keratoconjunctivitis sicca.
