Abstract
Introduction: To determine the proportion of military conscripts with ammetropia in this cohort study that may be suitable for Lasik corrective refractive intervention based on the success rate of using various machine to correct corneal refractive error. The parameters used for the evaluation are thickness of cornea and refraction of the sample population. Methods: 1,121 new male military conscripts aged 16 to 26 years with at least 1D of ammetropia were systematically selected from a population of 29,170 to undergo a Visante Anterior Segment Optical Coherence Tomography scan to determine their corneal curvature, thickness and anterior chamber depth. The stand-alone autorefractor, the Huvitz MRK-3100P machine was used to determine their refractive status. 4 models of machines were evaluated using their ablation table (Carl Zeiss Mel 80TM excimer laser, Zyoptix laser, VISX STAR S4 IR Excimer Laser System and Wavelight Allegretto Wave.) Results: It was found that 86.4% in our sample population are able to undergo Lasik successfully using Wavelight Allegretto Wave together with 130um femtosecond laser to create a flap. Our sample population represents 73.63% of the cohort population. As such, using the Wavelight Allegretto Wave may be able to correct 63.62% of the cohort population successfully. Conclusion: Despite the availability of the Lasik technology to correct for a wide range of refractive error, it is still dependant on the machine’s ability to correct by ablating minimum amount of corneal tissue so as to correct for higher range of refractive error while accommodating thinner corneas.
Meeting abstract presented at VSS 2012