Evaluation of the Safety and Efficacy of Ketotifen 4.0% Patch as Compared to Placebo Patch, Olopatadine 0.2% Ophthalmic Solution, and Artificial Tears in the Conjunctival Allergen Challenge (CAC) Model of Acute Allergic Conjunctivitis

Inclusion Criteria: * 18 years of age of either sex and any race * positive history of ocular allergies and a positive skin test reaction to cat hair, cat dander, dog dander, grasses, ragweed, trees, dust mites, and/or cockroaches within the past 24 months * able and willing to avoid all disallowed medication for the washout period and during the study Exclusion Criteria: * active ocular infection or skin condition * ocular surgery within the past 3 months * pregnancy or nursing