• Can Allergies Affect Just One Eye at a Time?


    Question:

    Can allergies affect just one eye but not the other?


    Answer:

    The simple answer is no. Typical allergies such as hay fever, etc., are systemic and affect both eyes. It is possible that a small amount of allergen can get in one eye and cause a temporary problem, but this is highly unlikely. A red, swollen, tearing eye can be caused by tear duct obstruction, foreign body, exposed suture, ill-fitting contact lens, or small chalazion (stye). Look for causes other than allergy. If you have not done so already, consult an ophthalmologist.