title: Contrast sensitivity after zyoptix tissue saving LASIK and standard LASIK for myopia with 6-month followup.
abstract: This control-matched comparative study evaluated changes in contrast sensitivity after Zyoptix tissue-saving (TS) LASIK and Planoscan standard LASIK (Technolas 217z, Bausch & Lomb) for myopia 6 months postoperatively. 102 TS LASIK-treated eyes were matched with 102 standard LASIK-treated eyes (divided into low, moderate, and high groups). There were no significant differences in refraction outcomes between the groups postoperatively. In high group, a significant reduction in contrast sensitivity after TS LASIK was found at high spatial frequencies (P < .05) under photopic conditions and at middle to high spatial frequencies (P < .05) under mesopic conditions. And significant reduction was also found in standard LASIK at high spatial frequency (P < .05) under mesopic conditions. The reduction was significantly lower in TS LASIK than that in standard LASIK at high spatial frequencies (P < .05) under mesopic conditions. TS LASIK was prone to reduce mesopic contrast sensitivity of high myopia at high spatial frequencies.
authors.affiliation: Department of Ophthalmology, School of Medicine, Xinhua Hospital Affiliated to Shanghai Jiao Tong University, 1665 Kongjiang Road, Shanghai 200092, China.
authors.forename: Li-Quan
authors.initials: LQ
authors.lastname: Zhao
authors.forename: Huang
authors.initials: H
authors.lastname: Zhu