Canthoplasty n. : The operation of forming a new canthus, when one has been destroyed by injury or disease.

Example:
What is Canthoplasty?

Taxonomy
canthopexy, tendon, canthoplasty, canthal, eyelids, lower eyelid, blepharoplasty, tarsal plate, blepharoplasty eyelid surgery, eye, reinforcement, canthus, upper and lower, patients, resuspension, the eye, eyelid surgery, eyelid plastic surgery.

Defination from the web:
Canthoplasty - canthopexy - lateral canthal tendon tightening with blepharoplasty eyelid surgery ... "Canthoplasty" refers to a procedure designed to reinforce lower eyelid support by detaching the lateral canthal tendon from the orbital bone and constructing a replacement. ...