One Eye Looks Different After Upper Blepharoplasty

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.
Another probablr 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.
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.
Consulting a Board Certified Facial Plastic Surgeon would be something that I recommend. We specialize in the face and are highly qualified to help you with this.
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The eyes are the most delicate tissues on the surface of the body. Thus, they are more sensitive to bruising and swelling associated with surgery.
It is very common to see asymmetries between the eyes after blepharoplasty during the first 3 weeks.
By six weeks, the swelling should have subsided enough so that you can accurately evaluate your results.