Lateral Canthoplasty in Asian Patient to Lengthen and Open Eyes?

In looking at you photo, I would strongly advise you against a lateral canthoplasty.  These are not cosmetic procedures.  They are for reconstruction.  You are highly likely to be disappointed with the result of this procedure even in the hands of the most expert surgeon.  Similarly for epicanthoplasty.  I generally advise strongly against these procedures. 
The purpose is to take an inside fold to an outside fold.  This can be a very nice adjunct to the double fold surgery.  However, it can also place a visible scar in the middle of the face that can trouble you for the rest of your life.  When we do the double fold surgery, the scar is hidden under the fold.  I would also strongly recommend that you have a very clear understanding with your surgeon regarding how much platform will be exposed by your surgery and where the fold will sit on the platform so you are not surprised after surgery.

Thank you for sharing your question and photo. Many young people have interest in lengthening their eyes horizontally. The problem is that the lid and skin are usually already tight and performing canthoplasty would make the eyelid tighter. This could cause several different problems. The other procedures you discussed are reasonable to have performed. 

Hi. You are young with good eyelid tone. The position of your lateral canthus is good. So no canthoplasty is needed. In fact, it can cause problems. What you can have is Asian upper blepharoplasty, with removal of small amount of skin only. The eyelid crease can be reformed as well.