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The most common forms of ocular allergy are seasonal allergic conjunctivitis and perennial allergic conjunctivitis. They can be annoying and negatively affect quality of life but are not sight-threatening.
Both are ocular hypersensitivity disorders caused by exposure to an allergen trigger and mediated by immunoglobulin E. Seasonal allergic conjunctivitis (SAC) is worse for most in the spring and fall, and perennial allergic conjunctivitis (PAC) lasts all year long.