To fix your scleral show and canthal tilt.
It's extremely simple and even normies should grasp this concept. If you have any deformities you should always check if you have any skeletal issues first. Soft tissue is the last thing you should check.
It is also extremely easy to get botched with soft tissue modifications. One small error can fuck your appearance up forever.
If your orbital rim is recessed, no shit that you have scleral show.
Fix the bones first, after that you can do the soft tissue modifications.
If you persist on doing the canthoplasty your "modifications" will return to baseline due to not having good bone support in the first place LOL.
If there isn't any bone support just LDAR or get implants.
Uncanny look
If you don't have the necessary bone support your results may look uncanny.
Just make yourself look like you are squinting 24/7 theory.
It is a dogshit surgery if the necessary bone support is just not there.
Now if you have the necessary bone support
And still have scleral show and other deformities you can consider a canthoplasty. Just check if your infraorbital rim is recessed.