الفهرس 
Corneal Basic Sciences and BiomechanicsOnly 14 pages are availabe for public view
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Abstract
Purpose : to report the incidence of ocular complications during and after fe mtosecond LASIK surgery for treatment of refractive errors
Design: prospective cohort study
Method: the study included 100 eyes of 52 randomly selected patients who underwent Femto-lASIK correction at Maghrabi eye hospital - Cairo for Myopic astigmatism, Compound myopic, Hyperopic astigmatism, Compound Hyperopic and Mixed astigmatism, and who completed the 6 months follow up period. All the patients were operated on by one surgeon.
Results : Age of enrolled patients ranged from 19-46 years with mean±SD age 27.154±5.972 years, sex distribution which was 22 male patients (42.31%) and 30 female patients (57.69%), the mean±SD preoperative spherical equivalent (SE) refraction was -3.563±2.953 SD ranging from (-8.5)-(+4) D while the mean post-operative (3rd month) spherical equivalent (SE) refraction was -0.092±0.511 SD ranging from (-1.50)-(+0.5) D with significant p-value , the mean±SD preoperative UCVA was 0.087±0.083 ranging from 0.03-0.4 which increased post-operatively to become 0.911±0.140 ranging from 0.5-1 with significant p-value, the mean±SD preoperative BCVA which was 0.954±0.091 ranging from 0.67-1, and the mean±SD post-operative BCVA which was 0.992±0.033 ranging from 0.8-1 with significant p-value, the incidence of intraoperative complications was as follow; vertical gas breakthrough = 6%, Opaque bubble layer= 30%, Air bubble in anterior chamber = 6%, Epithelial defect = 4%, Suction loss = 3%. No reports of decentered flaps or flap tears. The incidence of postoperative complications was as follow; enhancement for residual refractive errors = 12%, Diffuse lamellar keratitis = 4%, No report of displaced flap, infection and ectasia, and no worsening of the preoperative BCVA was seen in all patients.
Conclusion: Complications have not been entirely eliminated by femtosecond lasers but FS laser offers several advantages over the conventional microkeratomes and is gaining popularity across the globe. This is due to several advantages including reduced incidence of flap complications, greater surgeon choice and control over flap diameter and thickness, side cut angle, hinge position and length, Increased precision with improved flap safety and better thickness predictability and capability of cutting thinner flaps to accommodate thin corneas and high refractive errors.