Ocular allergy is a common condition associated with significant morbidity and economic burden from both direct and indirect costs.1-5 It encompasses a group of type I and type IV hypersensitivity-mediated ocular surface diseases that include seasonal allergic conjunctivitis (SAC), perennial allergic conjunctivitis (PAC), atopic keratoconjunctivitis (AKC), vernal keratoconjunctivitis (VKC), and contact lens–induced papillary conjunctivitis (CLPC; previously known as giant papillary conjunctivitis). According to various studies, the overall prevalence of ocular allergy ranges between 15% and 40%.1 However, SAC and PAC are the most common forms, accounting for up to 95% of allergic eye disease in the United States.
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