الفهرس 
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Abstract
LASIK is the most common procedure used to correct refractive errors. Conventional LASIK depends on a microkeratome to create the corneal flap. Femto Lasik uses femtosecond laser to create that flap. Those procedures may cause tear film instability, therefore patients often complain of dryness.
Dry eye disease can be problematic for some individuals, as it can affect their daily activities. Different tests are used to assess tear film stability and dry eye. One of the most recent tests is measurement of tear film stability by anterior segment Optical Coherence Tomography.
80 eyes of 40 patients were examined to compare between Femto LASIK and mechanical LASIK. Tear film stability was assessed by Tear Break-up Time Test, Schirmer’s Test and basically in our study by Anterior Segment Optical Coherence Tomography.
The data revealed decrease in tear film stability in the early postoperative period. The parameters measured were stabilized to near normal levels 3 months postoperatively. A slight difference was noticed between mechanical LASIK patients and Femto LASIK, although the difference was insignificant.