During conventional LASIK-type surgery, the protective layer in the form of corneal flap is surgically created by means of mechanical microkeratome with a sharp oscilating blade. Although the surgery is extremely safe and reliable, the idea of a vibrating blade working on their eye is not acceptable for a number of patients.
Compared to that, during ReLEx SMILE and femtoLASIK surgery (the methods can also be called femtolasik) the protective layer is created with delicate and precise laser, without using any sharp or cutting instruments. This so-called femtosecond laser can create the flap in a safe, precise and painless manner.
Femtosecond laser is used by NASA to treat its cosmonauts and by the US Army and US Navy to treat the members of combat units as well as pilots.