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, catdander, grasses, ragweed, and/or trees within the past 24 months.
• Calculated best-corrected visual acuity of 0.7 logMAR or better in each eye asmeasured using the ETDRS chart.
• Positive bilateral conjunctival allergen challenge(CAC)reaction within 10 minutes ofinstillation 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 thesubjects safety or trial parameters.
• Use of disallowed medications during the period indicated prior to study enrollment orduring the study.