Friday, November 6, 2009
prk vs lasik
At first, a ray of light is passed through the eye and is reflected off the retina as an outgoing wavefront. This wavefront is compared against a planar wavefront, in order to determine both lower and higher order aberrations. These aberrations are displayed on a monitor screen in the form of precise 3D images. This information is then used for a custom ablation of the cornea, with the aid of an excimer laser eye surgery system interfaced with the Aberrometer.
On the whole, the conventional LASIK procedure would suffice for the treatment of common lower order aberrations, such as myopia, hypermetropia and astigmatism.
However, higher order visual defects normally call for a much advanced surgical procedure like wavefront-guided LASIK.
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