Did you know the allergy's effect on your eyes should be treated separately? We talked to an optometrist Thursday, who says over the counter medicine used to treat sneezing and congestion typically don't work for your eyes. By the time the medicine travels through the blood stream, only a small amount actually makes it to your eyes. They recommend allergy suffers use antihistamines that are available by prescription. Medical experts say roughly fifty million Americans suffer from seasonal allergies.