INTRODUCTION:The aim of the study was to compare the visual performance of LASIK eyes measured using high-contrast logMAR letter charts under bright (photopic) and dim (mesopic) conditions. MATERIALS AND METHODS:A total of 46 subjects (35 +/- 8 years of age) undergoing LASIK procedures were recruited for the study. The best spectacle-corrected visual acuity (BSCVA) of each subject was measured using the high-contrast ETDRS logMAR chart under photopic and mesopic conditions at 3 visits: preoperative (Pre), 1 month postoperative (Post1) and 3 months postoperative (Post3). The differences in logMAR scores for the right eyes only were analysed for the Pre-Post1 (n = 46), Pre-Post3 (n = 18) and Post1-Post3 (n = 16) comparisons. RESULTS:The logMAR scores of subjects were worse at the 1-month postoperative visit than preoperatively, and improvement in visual performance was seen at the 3-month postoperative visit. These changes in visual performance became more evident under mesopic conditions. The means and standard errors of the differences in logMAR scores for the Pre-Post3 (0.097 +/- 0.020) were slightly larger than those of the Pre-Post1 (-0.067 +/- 0.019) and Post1-Post3 (0.031 +/- 0.012) comparisons. Under mesopic conditions, the visual performance of the subjects was statistically significant for the 3 comparisons, but not under photopic conditions. CONCLUSION:High-contrast logMAR chart performed under mesopic conditions has the potential to replace visual acuity measured under photopic conditions in providing more reliable representation of postoperative visual outcomes of LASIK eyes. Eye doctors should consider performing this vision test routinely to gauge the success of LASIK surgery.

译文

简介:本研究的目的是比较在明亮(明暗)和暗淡(近视)条件下使用高对比度logMAR字母图测量的LASIK眼睛的视觉性能。
材料与方法:共招募了接受LASIK手术的46名受试者(35 /-8岁)。使用高对比度ETDRS logMAR图表在以下3次就诊和视差条件下使用高对比度ETDRS logMAR图表测量每个受试者的最佳眼镜矫正视力(BSCVA):术前(Pre),术后1个月(Post1)和术后3个月(Post3) 。仅比较了Post-Post1(n = 46),Pre-Post3(n = 18)和Post1-Post3(n = 16)比较中的右眼logMAR分数的差异。
结果:术后1个月随访时受试者的logMAR评分较术前差,术后3个月随访时视力改善。在中视条件下,视觉性能的这些变化变得更加明显。 Post-Post3(0.097 /-0.020)的logMAR得分差异的均值和标准误比Post-Post1(-0.067 /-0.019)和Post1-Post3(0.031 /-0.012)比较的均值和标准误差稍大。在中视条件下,受试者的视觉表现在3个比较中具有统计学意义,但在明视条件下则不然。
结论:在中视条件下进行的高对比度logMAR图表有可能替代在明视条件下测量的视敏度,以提供更可靠的LASIK眼术后视觉结果的表示。眼科医生应考虑定期进行这种视力测试,以评估LASIK手术的成功率。

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