| http://www.w3.org/ns/prov#value | - er surface, environmental factors such as humidity, temperature and air movement affect the rate of evaporation from the ocular surface.30,31 Evaporation of the tear film is significantly slowed by an intact lipid layer with evaporation increasing at least four-fold if the lipid layer is absent or compromised.22,23,32 Tear film evaporation rates range between 1.4 and 39.3 ?? 10-7 g/cm2/s.33,34 Rec
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