Abstract
Abstract Background Near-sightedness, also known as short-sightedness and myopia, is a condition of the eye where light focuses in front of, instead of on, the retina. This causes distant objects to be blurry while close objects appear normal. Other symptoms may include headaches and eye strain. Severe near-sightedness increases the risk of retinal detachment, cataracts, and glaucoma. Objectives The aim of the present study is to quantify the biomechanical effects of Femtosecond LASIK for myopes using the Ocular Response Analyzer. Patients and Methods This is a prospective study that was conducted on 30 eyes. 20 patients signed an informed written consent. The (30) eyes underwent refractive surgery using Femto-LASIK flap creation by (IntraLase iFS, Abbott Medica Optics, California, USA) and excimer laser by (WaveLight Allegretto, Alcon, Fort Worth, Texas, USA). Results The same parameters used in our study, 40 eyes of 20 patients who underwent LASIK for myopia treatment using a femtosecond laser were enrolled. IOP and the corneal biomechanical markers were measured preoperatively and 1 month after LASIK using ORA and GAT. The mean preoperative CCT was548.63 µm with SD ± 27.71, mean preoperative CH was 10.89 mmHg with SD ± 1.50and CRF was 10.47 mmHg with SD ± 1.64. The postoperative CCT, MRSE, CH &CRF were 493 µm with SD ± 30.84, -0.80 with SD ± 0. 14 (D), 8.41 mmHg with SD ± 1.19 &7.16 mmHg with SD ± 1.33 respectively. The values are significantly lower than preoperative.(p <0.001). The mean preoperative IOPcc, IOPg, IOP by GAT was 14.31mmHg with SD ± 2.42,14.19 mmHg with SD ± 2.54, 13.42 mmHg with SD ± 2.19.respectively, while the mean postoperative IOPcc, IOPg and IOP by GAT was 13.64 ±2.09, 10.27± 2.26, 10.83± 2.83 respectively. Conclusion Myopic photorefractive surgery using Femto-LASIK flap creation causes reduction in CH and IOP; obvious change in the IOP-G value postoperatively, so it is more accurate to measure IOP-CC as it is a major factor to be taken into consideration.
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