Can Uneven Eyes Caused by Canthopexy Be Corrected?

Dear Overcorrected
I apologize to your friend on behalf of the surgeon who did this. I don't know that surgeon. However, I can assure you that if he/she had any idea that this would be the results eyelid surgery would never had been recommended. Canthopexy is not the answer. Canthopexy is a simple procedure that uses a stitch to tighten the lateral canthal angle. It is generally performed by eyelid surgeons who are not trained to perform an actual lateral cathoplasty.
The canthoplasty actually involved cutting the lateral canthal angle. The lower and upper limbs of the eyelid can then be separately tighten and the entire position of the angle can be changed. General plastic surgeons, and facial plastic surgeons get no training in this procedure. However, it is a common maneuver for oculoplastic surgeons.
In looking carefully at your friend's eyelids, there are a number of concerns. The right upper eyelid is ptotic or droopy. This contributes to the right eye looking small. The fat in the upper eyelids is over resected but this is a greater problem on the right. There is eyebrow ptosis with a flatness to the brow as if the forehead has been injected with too much BOTOX.
There is upper eyelid lash ptosis with the eyelashes pointing down. This problem is worse on the right side. The palpebral fissure, space defined by the eyelids around the eye has been made vertically shorter on the right but horizontally shorter on both sides also contributing to the eyes looking small. Normally when one looks at the eyes, the actually edge of the lower eyelid behind the eyelashes should not be visible. Here it is rolled out due to the incision below the eyelashes which is effectively focally rotating the lower eyelid margin out.
As this picture is only 4 weeks from surgery, it is likely that a number of this issues may get a little worse over the next few weeks and then gradually improve. However, it is likely that there will be a number of residual concerns that may need surgery to improve. This should not be undertaken for 6 to 12 months.
I think it is worth your while to consult with an oculoplastic surgeon who specializes in fixing post surgical issues just so you have these relationship and an opinion independent of your current surgeon.

It is best to wait at least 6 months for things to settle and heal completely.  The eyelid position may change up to 6 months or longer.  If they are still problematic (either functionally or cosmetically) after this period, then they can be evaluated for possible surgery.

It is possible to reverse the canthopexy procedure through a revision canthoplasty and/or canthopexy. They can be taken down or removed. The eyelids can be made more symmetrical. It is important to wait at least six months prior to undergoing any revision surgery of this nature.