You have set your question out very well and have supplied important information. It is very unusual for a child to only have one eye affected by an allergy.You do mention that his other eye has started to itch as well now. The most likely cause of your son's eye problem is indeed allergic conjunctivitis. Spring is here and the first grass pollens are already in the air.Allergic conjunctivitis does not usually respond very well to the use of an antihistamine taken by mouth. Also Allergex is not a good choice as it has the side effect of causing drowsiness. Try Allecet syrup instead 5ml at night. The only OTC eye drops that may help is Spersallerg. Try these and see if this helps. If not ask your doctor to see your son.
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