Double eyelid surgery creates or defines an upper eyelid crease to give a natural-looking fold and more definition to the eye. Surgeons individualize crease height/shape to your anatomy and goals, and may combine procedures (e.g., ptosis repair or epicanthoplasty) when appropriate.
The technique is chosen to suit the eyelid rather than to a single template, and the suture and incisional methods differ in how long they last and how long the swelling takes to settle. Most people are back to desk work inside two weeks, with the final shape becoming clear over several months. Where the main concern is excess upper-lid skin rather than the absence of a crease, surgeons often weigh this against eyelid surgery.