You don't mention whether the difference in pupil size is definitely new, definitely not new, or you can't be sure whether or not it is a new problem. Try to figure this out.
With a change in pupil size and
blurredVision problems vision, you should ask your parents to arrange an evaluation by a pediatric Eye MD. You can find one near you by going to www.aapos.org and using the doctor locator.
I would recommend that you seek the care of an eyeMD to determine the cause. Has this always been like this or was it associated with a recent illness? Some possible causes of anisocoria or a pupil size disparity include Adie’s tonic pupil, brain tumors, vascular abnormalities, trauma, infections.
Dr. Feldman
Sandy T. Feldman, M.D., M.S.
ClearView Eye and Laser Medical Center
San Diego, California