An allergy is a hypersensitivity reaction of the immune system causing the immune system to react to a substance as foreign. This reaction normally results in wide spectrum of ocular symptoms including excessive itching, tearing and redness but may sometimes only involve mild discomfort.

These symptoms can be managed with eye drops. It is important to note that severe cases require long term ophthalmological care. This condition mostly affects children and fortunately they normally outgrow it during their teenage years.