This document discusses three types of allergic conjunctivitis: allergic rhinoconjunctivitis, vernal keratoconjunctivitis, and atopic keratoconjunctivitis. Allergic rhinoconjunctivitis involves a hypersensitivity reaction to airborne antigens and is associated with nasal and eyelid swelling. Vernal keratoconjunctivitis commonly affects children and males in warm climates and involves itching, discharge, and tearing, with papillae forming on the eyelids that can rupture and form giant papillae. Atopic keratoconjunctivitis typically affects young patients with atopic dermatitis and causes red, thickened, fissured eyelids, with