Allergens that may be present indoors or outdoors can cause eye allergies. the most common outdoor airborne allergens are grass, tree and wood pollens. People who are sensitive to these allergens suffer from seasonal allergic conjunctivitis, the most common type of eye allergy. Pet hair or dander, dust mites and moulds are the most common indoor allergens. These indoor allergens can trigger symptoms for some people throughout the year, resulting in perennial allergic conjunctivitis.
Although cigarette smoke, perfume and diesel exhaust may inflame your eyes, they act as irritants rather than triggering an allergic response. They can, however, make your allergy symptoms worse.
It is important to diagnose the cause of redness correctly before deciding the course of treatment.
At the first sign of persistent redness or irritation in the eye, consult your eye specialist.