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Ocular Surface Disease Index

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Ocular Surface Disease Index (OSDI) The OSDI questionnaire was used to quantify the dry eye symptoms before surgery and 2 weeks, 1 month and 3 months postoperatively. In this questionnaire, patients were asked about dry eye symptoms that they had experienced during a 1-week recall period. Each answer was scored on a 4-point scale from zero (indicating no problems) to four (indicating a significant problem). Accordingly, we combined the responses to all of the questions to generate a composite OSDI score that ranged from 0 to 100, with higher OSDI scores indicating more severe symptoms. Statistical analysis We used SPSS version 20.0 (SPSS Inc., IBM, USA) in statistical analysis and results are expressed as mean ± standard deviation …show more content…

There were no statistically significant differences between the three groups in relation to age, preoperative spherical equivalent, central corneal thickness and keratometric readings (P>0.05) (Table 1). Table 1: Preoperative selected characteristics. Variable Lasik group (n=30) Femtolasik group (n=38) SMILE group (n=35) F P Age 23.84 ±4.75 23.84 ±4.75 24.43 ±5.91 0.66 0.52 Gender (M / F) 6 / 9 7 / 12 7 / 11 -- -- SE (D) -4.49 ±2.05 -4.14 ±1.97 -5.45±2.06 4.08 0.019 CCT (μm) 552.84±12.25 531.96±9.06 528.32±10.65 Mean K (D) 43.16±1.27 43.41±1.08 43.57±1.15 Data are means ± SD of 103 eyes of 52 preoperatively. n= number of eyes, M/F=Male/Female, SE= spherical equivalent, D= diopter, CCT=Central Corneal Thickness, μm= micrometer, K=Keratometric reading. A one-way between subject ANOVA found insignificant differences between groups in age, preoperative and postoperative spherical equivalent (P>0.05). On the other hand, significant differences between groups were detected in the mean flap and cap thickness as it was 123.37±4.41μm in Lasik group, 105.03±2.49μm in the Femtolasik group and 105.89±2.21μm in the SMILE group

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