Allergic conjunctivitis is an inflammation of the outer layer of the eye that usually arises together with hypersensitivity to such allergens as pollen or animal fur. It can, however, also affect people without a history of allergy. Symptoms include itchiness and a feeling of grittiness on the inner surface of the eyelid. Swollen conjunctiva, which may appear as a blister on the white of the eye, may also be a symptom of conjunctivitis. The tear fluid of a patient suffering from conjunctivitis can become viscous and fibrous. Conjunctivitis vernalis is an allergy-related condition that is most common in children aged 3-5 years. It is characterised by severe itching and sensitivity to light.
The first step in any treatment is to determine the cause of the allergy and remove it from the patient’s surroundings. Topical treatment with sodium chromoglicate or an antihistamine may be necessary. Antihistamines can also be taken as tablets.