Study of Accuracy of Corneal Flap Thickness by Using Femtosecond Laser Technology
Journal Title: The Egyptian Journal of Hospital Medicine - Year 2018, Vol 71, Issue 3
Abstract
<strong>Background- </strong>LASIK is the most popular surgery to correct the refractive errors nowadays. It is proved to be safe, effective and well predictable. It is important to produce a uniform flap with a narrow SD from the intended thickness. The Integrated optical pachymetry is a convenient and useful feature of the EX500 excimer laser which can be used to measure flap thickness intraoperatively.<strong>Objectives:</strong> this study aimed to detect the accuracy of Allegretto Wavelight FS200™ platform in creation of different corneal flap thicknesses. <strong>Patients and</strong> <strong>Methods: </strong>sixty eyes of 30 myopic patients were included in our study, the patients were operated by 2 different surgeons from June 2017 till December 2017. The patients were distributed randomly into 3 studied groups. <strong>Group I</strong> (20 eyes with intended fs flap 100um), <strong>group II</strong> (20 eyes with intended fs flap 110um) and <strong>group III</strong> (20 eyes with intended fs flap 120um). All participants were subjected to full medical history taking, uncorrected distance visual acuity, slit-lamp microscopy, corneal topography using oculus® pentacam device, manifest and cycloplegic refraction, corrected distance visual acuity, fundus bio-microscopy examination using 90 D lens. <strong>Results: </strong>inthis study 100μm thickness group (<strong>Group A</strong>) showed the lowest difference between the mean result and the intended flap (-0.35um) followed by the 120um group (<strong>Group C</strong>) with difference of (-2.9um) between the mean result and the intended flap thickness followed by the 110μm group (group B) with the highest difference (-3.45um) from the intended flap thickness. <strong>Conclusion: </strong>the flaps made with the Wavelight FS200 femtosecond laser were predictable and uniform more predictable in <strong>group A</strong> than <strong>in group C </strong>and B, but with no statistical significance between the three studied groups (P=0.402).
Authors and Affiliations
Eman Helal
Keywords
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