LASIK (Laser-assisted in situ Keratomileusis) is a procedure where the curvature of the cornea is restructured to correct your vision. If you are nearsighted, your cornea is too curved, causing the image to appear blurry because the light rays meet before the retina. If you are farsighted, your cornea may be too flat, causing the image to form behind the retina. LASIK can make your cornea more curved or flat, depending on what your condition requires. If you have astigmatism, some areas of your cornea may be irregularly curved, causing light rays to hit the cornea at multiple points, resulting to blurry vision. LASIK can also correct astigmatism.
In a LASIK procedure, your ophthalmologist uses either a laser or a blade on your cornea to create a thin flap of tissue. This flap is then lifted so that the computer-controlled laser can easily access the inner corneal layers (the stroma). The laser carefully performs the needed reshaping of the cornea to correct your vision, and then the flap is put back over the cornea to heal in a few days.
Wavefront-guided LASIK is an advancement of the traditional LASIK procedure where specific irregularities in a patient’s eye are also corrected. These irregularities, called higher-order aberrations, may cause symptoms like increased sensitivity to lights, halos, blurry vision and difficulty seeing at night. Wavefront-guided LASIK performs special mapping of the eye to determine any irregularities, so that the LASIK procedure can also correct any higher order aberrations in addition to reshaping the cornea to improve vision.