The eyes react when they come in contact with allergens. An allergic reaction can affect one or both eyes. It causes redness and itching under the eyelid, watering of the eye and sensitivity to light. When waking in the morning, eyelids might feel like they are glued shut. Ocular allergy is most often uncomfortable and unattractive. In its most serious form, ocular allergy can cause damage to the eye.
Ocular allergy is quite a common condition. The strength of the allergic reaction, the length of time it lasts, and the number of times it happens are different for each person. Some people might find they have a strong reaction to an allergen at one time, and a weaker reaction to the same allergen at another time.