Study of AzaSite Versus Vigamox in the Tears of Healthy Volunteers

Inclusion Criteria: * Have visual acuity, using corrective lenses (no contact lenses) if necessary, in both eyes of at least +0.7 as assessed by Early Treatment of Diabetic Retinopathy Study. * Have normal lid anatomy. Exclusion Criteria: * Have an abnormal biomicroscopy or ophthalmoscopy exam. * Have a diagnosis of dry eye disease or have experienced any of the dry eye symptoms (photophobia, foreign body sensation, itching, burning, pain, dry or grittiness) in the past thirty days. * Have used artificial tears in the past thirty days. * Have a diagnosis of on-going ocular infection or lid margin inflammation. * Have ever had penetrating ocular surface or intraocular surgery. * Have a known hypersensitivity to azithromycin, or any macrolide antibiotic or to any of the ingredients in AzaSite. * Have had a known hypersensitivity to Vigamox or any fluoroquinolone antibiotics or to any of the ingredients in Vigamox. * Have had corneal or lid abnormalities. * Have glaucoma, or Intra Ocular Pressure of 22 mm Hg or greater in one or both eyes. * Have any ocular pathology with the exception of cataracts. * Have a serious systemic disease or uncontrolled medical condition. * Have experienced symptoms of viral or allergic conjunctivitis in the past 30 days. * Have a history of liver or kidney disease resulting in persisting dysfunction.