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LASIK basically involves 3 steps:


Step 1:

Create the flap in the front of the cornea with the flap still attached on a hinge.

Step 2:

The corneal flap is folded to the side, and the excimer laser is applied on the cornea to correct the refractive error.

Step 3:

The corneal flap is then replaced to cover the area removed by the laser.

- Methods to Create the Flap (the hardware)

- Methods of Excimer Laser Ablation (the software)

- Iris-Recognition Advanced Control Eyetracker (ACE)


PRK In PRK, the most superficial layer of the cornea, called the epithelium, is removed. The excimer laser is then used to reshape the surface of the cornea, changing its curvature and therefore correcting the refractive error.

Because the surface layer of the cornea is removed, there will be more discomfort, longer healing time and a higher risk of corneal haze and scarring compared to LASIK.