Ocular allergy is recognized as a heterogeneous collection of immunoglobulin E (IgE) and noneIgE-mediated diseases. IgE-mediated ocular allergies include seasonal allergic conjunctivitis, perennial allergic conjunctivitis, 1 vernal keratoconjunctivitis, and atopic keratoconjunctivitis. NoneIgE-mediated ocular allergies and hypersensitivities include contact blepharoconjunctivitis, giant papillary conjunctivitis, irritative conjunctivitis, and blepharitis.The following 4 cardinal symptoms characterize ocular allergies: redness, itchiness, swelling, and watering (tearing), with several symptoms overlapping with dry eye disease.Allergological workup (skin prick testing, serum-specific IgE measurements, conjunctival provocation testing, and patch testing) is helpful in confirming a causative allergic mechanism.Newer topical corticosteroid formulations such as loteprednol have not been found to increase the risk of cataracts unlike older corticosteroids.Successful treatment usually involves a combination of avoidance of allergic triggers, medications (topical, oral, or both), and in some cases, allergy immunotherapy.