Eye allergies occur when an allergen comes into contact with the cells in the eyes that produce histamine, which wards off the substance causing a reaction. Most types of eye and nose allergies usually happen in conjunction. This means that people who have nasal allergies can also suffer from eye allergies.
Usually, eye allergies can cause mild but uncomfortable symptoms. Common eye allergy symptoms include watery eyes, swelling in the eyelids, and sensitivity to light.
Eye allergies can also be triggered by allergens that did not come into contact with the eyes. Some people get eye allergies by ingesting certain foods or from insect bites.
Just like with nasal allergies, over-the-counter antihistamines or artificial tears can treat an eye allergy. Types of eye allergies include:
Allergic conjunctivitis is the inflammation of the conjunctiva, which is the clear layer of tissue that protects the sclera or the white of the eye.
This type of eye allergy causes bumps to form on the surface of the eye, specifically on the eyelid. Vernal keratoconjunctivitis usually occurs in younger males who are residing in areas with warm climates.