By john mce
 Laser Assisted Sub Epithelial Keratectomy (or LASEK) is a surgical laser procedure which is carried out to correct refractive error in the cornea. It is specifically designed to correct astigmatism, hyperopia (farsightedness) and myopia (nearsightedness). LASEK is a technique which combines Laser Assisted in Situ Keratomileusis (LASIK) and Photo Refractive Keratectomy (PRK), in the hope of decreasing the occurrence of flap-related complications associated with LASIK. It is particularly helpful for patients whose cornea is too thin for LASIK.
The cornea consists of layers of translucent tissue that protects the eye from light. There are five layers, from superficial to deep they are: corneal epithelium, the Bowman layer, the stroma, Descemet membrane and the endothelium.
Defects in the corneal epithelium can cause severe pain, but are quick to heal in healthy eyes. The Bowman layer, however, is not replaced after injury, and this tough layer may become standard scar tissue. The stoma makes up 90% of corneal thickness and gives the cornea its strength and shape. The Descemet membrane, like the Bowman layer, is not replaced after injury, and may turn into scar |
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