This is a question that I answered for someone who had a procedure by another physician.
There are many reasons why one eye would be smaller than the other. Swelling can be the most likely reason. No matter how well you do the surgery, you cannot control swelling sometimes. The body is a complex thing and many reasons could account for why one side is more swollen than the other after blepharoplasty.
Another probable cause is sometimes, manipulation of the muscle that opens the eye could have caused it to be temporarily tired. This could take months to resolve. Sometimes, if your surgeon has attempted to recreate your crease, there could by many more reasons for your eyes to look differently. This would depend on just what was done. You will have a tired eye just from the manipulation when you recreate the crease in double eyelid blepharoplasty which is done often in Asians.
Sometimes, when you create the crease too high on the muscle, it could tether it coming up and effect the movement of the muscle. You would really have to be seen by your physician to determine just what is going on. But wait it out for now and I wouldn’t worry about it until at least a month.
Dr Young is located in Bellevue near Seattle Washington