Inclusion Criteria:  M or F 18<age<60 BCVA>=9/10 Signed informed consent, voluntary adherence to treatment  Exclusion Criteria:  Pregnancy/breastfeeding Conjunctivitis Thyroid disease Diabetes Rheumatologic diseases including Sjogren's syndrome Neurologic conditions, including stroke, Bell's palsy, Parkinson's, trigeminal nerve problem Refractive surgery (LASIK or PRK) Other Eye Surgeries HSV Keratitis Medication/supplement use, including psychiatric medicines, OTC cold medicines, anti-histamines, beta-blockers, pain relievers, sleeping pills, diuretics, Hormones replacement, and oral contraceptives Chemical splashes / injuries to the eyes Contact lens use Environmental (dusty, windy, hot/dry) Any treatment for dry eye in previous 4 weeks (including lubricants, steroids, cyclosporine)