An allergy is a response of the body against an allergen. It is an exaggerated reaction of the immune system against a substance that is not naturally present in the body. The eye as a whole – lids, conjunctiva and cornea can be impact – in direct contact with the environment is more frequently affected by allergic reactions. These ocular allergies occurred frequently – approximately 40 to 60% of allergic people have ocular symptoms – and it’s a burden. Find out what forms those allergies take, what are the causes and how to treat them!