Allergic conjunctivitis, caused by allergens such as pollen, perfumes, cosmetics, smoke,[REF] dust mites, Balsam of Peru (used in food and drink for flavoring, in perfumes and toiletries for fragrance, and in medicine and pharmaceutical items for healing properties),[REF] and eye drops [REF].
Keratoconjunctivitis is the combination of conjunctivitis and keratitis (corneal inflammation).