The body reacts to the trigger by releasing histamine, causing the blood vessels in the eye to dilate and irritating the nerve endings so the eyes water. Itchy eyes can be triggered by exposure to pollen, animal fur, mould, dust mites, make-up or eye drops. The most common cause of itchy eyes is an allergy. You might also have itchy eyelids, usually at the base of the eyelashes, and your eyes and/or eyelids might be swollen. Itchy eyes are usually caused by an allergy or by a condition called dry eye syndrome. Itchy eyes, also known as ocular pruritis, are a very common problem.
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