<unk>  uses a device called a microkeratome to separate a thin layer of the cornea and create a flap. The eye is anesthetized and a ring is fixed to it in order to keep it properly positioned and flat. The microkeratome then makes a small incomplete flap across the cornea by cutting across it. While still attached at one side, the corneal flap is folded back to reveal a sub layer of cornea. At this point, the microkeratome is precisely readjusted to match the calculated cut depth for the patient's vision correction. The calculation is based on the patient's glasses and contact lens prescriptions. The surgeon then passes the microkeratome completely over the eye making the power cut. After the power cut, the corneal flap is laid back over the eye where it reattaches.<unk>  is a technique used to correct very high levels of myopia and is generally used from -5.00 to -18.00 diopters of nearsightedness.
Automated lamellar keratoplasty
Conductive keratoplasty
Laser thermal keratoplasty
Descemet membrane endothelial keratoplasty
Corneal transplantation
Phototherapeutic keratectomy
Boston keratoprosthesis
Photorefractive keratectomy