I would get it done sooner rather than later. My friends son's eye was damaged during labour because of the use of the forceps.
He recovered well and it's amazing to the difference. He had the operation at 12 months and just bounced back. And she doesnt regret making the decision for him.
If it hasnt corrected itself by now, I would go for it. Like pp said before it interferes with school, social life etc.