A Single-Center Evaluation of the Relative Efficacy of EM-100 Compared to Zaditor® (Ketotifen Fumarate Ophthalmic Solution 0.035%) and Vehicle

Inclusion Criteria: * be at least 18 years old * have a positive history of allergic conjunctivitis and positive skin test reaction to allergens * be willing to avoid disallowed medications for the appropriate washout period and throughout the trial * be willing to avoid contact lens use * be willing to have a pregnancy test * must be able to read an eye chart from 10 feet away Exclusion Criteria: * must not have any allergies to the study medications * must not have any ocular or non ocular condition that investigator feels will interfere with study parameters * must not have used an investigational drug or device in the past 30 days or currently be enrolled in another investigational trial