From Personaleyes (Chan, Pattamatta, Meades), Department of Biomedical Engineering (Butlin), and Department of Ophthalmology (Bala), Macquarie University, Sydney, Australia.
From Personaleyes (Chan, Pattamatta, Meades), Department of Biomedical Engineering (Butlin), and Department of Ophthalmology (Bala), Macquarie University, Sydney, Australia.
J Cataract Refract Surg. 2017 Apr;43(4):480-485. doi: 10.1016/j.jcrs.2016.12.033.
To compare the breaking force required to tear the explanted capsule after femtosecond laser-assisted cataract surgery in the worse eye and manual cataract surgery in the contralateral eye.
Personaleyes, Sydney, Australia.
Prospective nonrandomized case study.
Patients with bilateral cataract had femtosecond laser-assisted cataract surgery with the Lensx laser in the eye with worse vision and manual cataract surgery in the contralateral eye. Each explanted capsule was stretched mechanically, and the breaking force and strain in grams (g) were compared. When a large contralateral difference in capsule strength was found, scanning electron microscopy (SEM) was applied to determine whether morphologic imperfections were present in a case with a weak capsule.
Paired samples of 78 eyes of 39 patients were tested. The mean breaking force was not significantly different between manual capsulorhexes (2.3 g ± 2.0 [SD]) and femtosecond laser capsulotomies (2.0 ± 2.2 g, P = .52). The breaking strain for the manual samples (33.8% ± 18.3%) and for the femtosecond laser samples (34.6% ± 18.6%) were also not significantly different (P = .81). In 5 patients, in the femtosecond group, the capsules required considerably less force to break than the capsules in the manual group. However, the SEM images of these samples did not show specific laser imperfections.
In paired human eyes, the capsulotomies created by a femtosecond laser with a contact lens interface were as strong as manual capsulorhexes.
比较在较差眼行飞秒激光辅助白内障手术后和在对侧眼行手动白内障手术后撕除囊袋所需的撕裂力。
澳大利亚悉尼 Personaleyes。
前瞻性非随机病例研究。
双眼白内障患者在较差眼行 Lensx 激光飞秒激光辅助白内障手术，在对侧眼行手动白内障手术。每个取出的囊袋都进行机械拉伸，比较撕裂力和克数（g）的应变。当发现囊袋强度的显著差异时，应用扫描电子显微镜（SEM）确定在囊袋较弱的情况下是否存在形态缺陷。
对 39 例患者的 78 只眼进行了配对样本测试。手动撕囊（2.3±2.0 g，SD）和飞秒激光囊切开术（2.0±2.2 g，P=.52）的平均撕裂力无显著差异。手动样本（33.8%±18.3%）和飞秒激光样本（34.6%±18.6%）的撕裂应变也无显著差异（P=.81）。在 5 例患者中，飞秒激光组的囊袋所需的撕裂力明显小于手动组。然而，这些样本的 SEM 图像并未显示出特定的激光缺陷。
在配对的人眼中，带有接触镜界面的飞秒激光产生的囊切开术与手动撕囊一样坚固。
