Allergic conjunctivitis Etiology

Ocular allergy is a broad term that includes several diseases with the hallmark symptom of itching, often accompanied by tearing, conjunctival swelling, and nasal congestion.14 Seasonal ocular allergy is the most common type of allergic conjunctivitis. This is an IgE-mediated hypersensitivity to pollen or other airborne allergens.11 Often, the patient's history is positive for atopic conditions such as allergic rhinitis, asthma, or eczema.14 Perennial allergic conjunctivitis has similar but less severe symptoms and may not be tied to a specific time of year. Finally, conjunctivitis medicamentosa is a contact allergy to a topical medication, often an antibiotic.11

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