Excimer Laser, short for EXCited diMER, is a gas molecule, Dimer Argon Fluor that emits photon's energy when stimulated by an electrical field. This laser is used to perform corneal superficial abrasion in order to correct refractive errors: myopia, hyperopia, astigmatism.
Excimer Laser treatment is always computer-assisted to define the ablation profile according to the preoperative examination.