Effect of Brimonidine Tartrate Ophthalmic Solution 0.15% on Pupil Diameter in Normal Eyes

Inclusion Criteria: * Adult active duty personnel between 18 and 50 years of age with best corrected visual acuity of 20/20 or better. Exclusion Criteria: * Patients not meeting above stated age criteria * Females that are pregnant or lactating (non pregnant females of childbearing potential will have pregnancy test prior to participating in study) * History of serious ocular, neurological, cardiovascular disease * History of severe systemic disease * History of arrhythmias or high blood pressure * Patients currently taking any type of ocular or systemic medications except multivitamins. * Patients with abnormal pupil shape, Addie's pupil, anisocoria, or abnormal pupil defect.