Abstract
Tears are a complex fluid, the components of which are secreted by several different glands and cell types. Tears are responsible for maintaining optimal concentrations of pH, osmolarity, ionic concentrations and proteins necessary for the function of the ocular surface.1,2 Thus, exquisite control of secretion of tears is required, and, when this control is compromised, disruption of the ocular surface and eventually ocular surface disease can occur.4 These ocular surface diseases include a range of tear-deficient disorders known as dry eye syndromes.
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