Ketotifen/Naphazoline Ophthalmic Solution in the Conjunctival Allergen Challenge Model of Allergic Conjunctivitis.

Inclusion Criteria: * Positive history of ocular allergies and positive skin test reaction to cat hair, cat dander, grasses, ragweed, and/or trees within the past 24 months. * Calculated best-corrected visual acuity of 0.7 logMAR or better in each eye as measured using the ETDRS chart. * Positive bilateral conjunctival allergen challenge(CAC)reaction within 10 minutes of instillation of the last titration of allergen at visit 1. * Positive bilateral CAC reaction in at least 2 out of 3 time points at visit 2. Exclusion Criteria: * Known contraindications or sensitivities to the study medication or its components. * Any ocular condition that, in the opinion of the investigator, could affect the subjects safety or trial parameters. * Use of disallowed medications during the period indicated prior to study enrollment or during the study.