Gharaee Hamid, Ghanavati Siamak Zaree, Rad Saeed Shokoohi, Omidtabrizi Arash, Naseri Hashem
Eye Research Center, Khatam-Al-Anbia Hospital, Mashhad University of Medical Sciences, Mashhad, Iran.
Cornea Research Center, Khatam-Al-Anbia Hospital, Mashhad University of Medical Sciences, Mashhad, Iran.
J Curr Ophthalmol. 2016 Feb 3;27(3-4):82-6. doi: 10.1016/j.joco.2015.11.007. eCollection 2015 Sep-Dec.
To investigate the efficacy of Technolas 217Z eye tracking system (torsional component) in corneal surface irregularity and high order aberrations (HOAs) after photorefractive keratectomy.
Patients with compound myopic astigmatism among persons demanding refractive surgery in Khatam-al-Anbia Eye Hospital with the mean age of 29 years were enrolled in this double-blind randomized interventional study. The mean spherical equivalent (SE) of refractive error was -4.75 diopters(D) (range: -1.5 to -7.0), and the mean astigmatism was 3 D (range:1.0-4). Many studies were performed for each patient including: A complete eye examination, visual acuity and Monocular contrast sensitivity evaluation, and refraction. Corneal topography, Orbscan II, and wavefront aberrometry were conducted. One eye was randomly assigned for aspheric treatment and applying eye tracking system. The other eye was treated without torsional eye tracking system. The outcome measures were uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), contrast sensitivity, corneal irregularity index in 3 mm and 5 mm optical zones in Orbscan II, and mean total HOAs at the 6-monthvisit.
Fifty eyes of 25 patients were enrolled. Mean UCVA was improved significantly in both the study and control groups in the 6-month post-operative follow-up. There was no significant difference between the 2 groups in UCVA and BCVA (P = 0.185 and P = 0.176, respectively). Total HOAs increased in both groups after PRK. However, they were lower in eyes treated with the eye tracking system (P < 0.001). Corneal irregularity index in 3 mm and 5 mm central zones in Orbscan II was significantly lower in the study group (P = 0.045 and P = 0.031 respectively). Contrast sensitivity function was not different in the 2 groups (P = 0.15).
Our study findings suggest that applying 'Technolas 217z' eye tracker system (Bausch and Lomb Advanced) results in a more regular anterior surface of cornea. Therefore, we recommend it for surface laser refractive surgery.
研究Technolas 217Z眼动追踪系统（扭转分量）在准分子激光角膜切削术后角膜表面不规则性和高阶像差（HOAs）方面的疗效。
在哈塔姆-安比亚眼科医院，将平均年龄29岁、要求进行屈光手术的复合性近视散光患者纳入这项双盲随机干预研究。屈光不正的平均等效球镜度（SE）为-4.75屈光度（D）（范围：-1.5至-7.0），平均散光为3 D（范围：1.0 - 4）。对每位患者进行了多项检查，包括：全面的眼部检查、视力和单眼对比敏感度评估以及验光。进行了角膜地形图检查、Orbscan II检查和波前像差测量。一只眼睛被随机分配接受非球面治疗并应用眼动追踪系统。另一只眼睛则在没有扭转眼动追踪系统的情况下进行治疗。观察指标包括裸眼视力（UCVA）、最佳矫正视力（BCVA）、对比敏感度、Orbscan II中3毫米和5毫米光学区的角膜不规则指数以及6个月随访时的平均总高阶像差。
纳入了25例患者的50只眼睛。在术后6个月的随访中，研究组和对照组的平均裸眼视力均有显著提高。两组在裸眼视力和最佳矫正视力方面无显著差异（P分别为0.185和0.176）。准分子激光角膜切削术后两组的总高阶像差均增加。然而，使用眼动追踪系统治疗的眼睛中的高阶像差较低（P < 0.001）。研究组中Orbscan II 3毫米和5毫米中央区的角膜不规则指数显著较低（P分别为0.045和0.031）。两组的对比敏感度函数无差异（P = 0.15）。
我们的研究结果表明，应用“Technolas 217z”眼动追踪系统（博士伦高级版）可使角膜前表面更规则。因此，我们推荐将其用于表面激光屈光手术。
