What type of corrective eye surgery is least likely to leave a scar?

Lasik surgery: In lasik surgery one makes a flap and treats under the flap because the treatment is under the surface there is no scar.

Unlikely: Scarring is very unlikely with all modern refractive surgery when performed by an experienced surgeon on a good candidate. Certain risk factors can make scarring more likely with a procedure named prk but overall the risk is extremely low.