Can a Positive Canthal Tilt Be Achieved? (photo)

I have a really negative canthal tilt (which is rather unaesthetic). And it is somewhat asymmetrical. My question is whether or not a positive or even neutral position of the eyes can be achieved through surgical means. I have heard that such procedures as a canthoplasty and or upper eyelid surgery can achieve this. But have been unable to find much information on the matter (or surgeons that even offer this kind of procedure). Thank you for your consideration.