Mizoguchi T, et al. - An inquiry was initiated regarding the efficacy and safety of 0.05% epinastine and 0.1% olopatadine eye drop preparations as seasonal and preseasonal treatments, among patients with seasonal allergic conjunctivitis (SAC). Equally effective results were gained via the seasonal treatment with 0.05% epinastine or 0.1% olopatadine, for the study cohort. Yet, the study revealed that 0.05% epinastine was more effective than 0.1% olopatadine, for preseasonal therapy.