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Rabbit tears and lacrimal gland fluid were collected simultaneously during pilocarpine stimulation with the goal of comparing the ionic composition of these fluids at various flow rates. Ions measured were sodium, potassium, calcium, magnesium, zinc, chloride, and bicarbonate. Human tears were also analyzed for purposes of comparison. Generally, tears and lacrimal gland fluid do not differ in ionic composition except for zinc and bicarbonate, which are in higher concentration in tears than in lacrimal gland fluid. The ionic composition of tears and lacrimal gland fluid of vitamin A-deficient rabbits was also analyzed. The maximal flow rate of lacrimal gland fluid was decreased in vitamin A-deficient rabbits as were calcium levels in tears and lacrimal gland fluid, as compared with controls. Concentrations of other ions generally did not differ from normal levels, indicating that vitamin A deficiency has only moderate effects on lacrimal gland function in the rabbit.
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