Comparison of functional vision Between Wavefront and Conventional LASIK determined by Glare disability and Contrast Sensitivity

Abstract

Abstract: : Purpose: Distortion of vision in the form of glare and halos is one of the major concerns after excimer laser refractive surgery. In this study, we compare the glare disability and contrast sensitivity with the glaremeter, which proved the reproducibility and reliability. Methods:Ninety six eyes of 52 patients were included. After preoperative evaluation, forty six eyes of 25 patients were underwent wavefront guided LASIK procedure and fifty eyes of 27 eyes were underwent conventional LASIK. Until postoperative six months, visual acuity, glare disability and contrast sensitivity was measured monthly. Glare disability was measured by glaremeter which was introduced at 2003 ARVO (Program #2613). And contrast sensitivity was measured with the Pelli–Robson letter sensitivity chart at 1 m with a chart luminance of 85cd/m². Results:During the glare test, the mean luminance of the test room was 5.4±0.4cd/m². Glare disability measured glaremeter showed a statistical significance between the two groups until six months (1108±583 vs 1097±539 at preoperation, 1423±356 vs 2834±638 at 1^st month, 1583±488 vs 2943±873 at 3^rd month, 1145±478 vs 2281±783 at 6^th month) (p<0.05). Contrast sensitivity test also showed a statistical significance between the wavefront and conventional LASIK operated group (1.82±0.21 vs 1.81±0.18 at preoperation, 1.63±0.31 vs 1.55±0.29 at 1^st month, 1.66±0.27 vs 1.54±0.26 at 3^rd month, 1.71±0.23 vs 1.60±0.30 at 6^th month. Until three months, the wavefront LASIK group showed more favorable visual acuity (p=0.023), but not in six months (p=0.134). Conclusions: Functional vision change following LASIK showed a statistically significant decrease compared with the preoperative status in both group. However, the functional vision change appears to be less significant in wavefront LASIK operation until postoperative six months.

Keywords: refractive surgery: comparative studies • refractive surgery • visual acuity