Shahhoseini Saied, Hashemi Hassan, Asgari Soheila
Noor Ophthalmology Research Center, Noor Eye Hospital, Tehran, Iran.
Noor Research Center for Ophthalmic Epidemiology, Noor Eye Hospital, Tehran, Iran.
Int Ophthalmol. 2018 Aug;38(4):1379-1383. doi: 10.1007/s10792-017-0595-2. Epub 2017 Jun 12.
To compare the actual depth of the tunnel created with femtosecond laser for intracorneal ring segment (ICRS) implantation with the target depth in keratoconus patients.
In this mix design study, eligible keratoconus patients were identified through chart review. The inclusion criterion was a history of ICRS implantation with femtosecond laser more than 6 months prior to enrollment. Participants underwent anterior segment optical coherence tomography using Spectralis (Heidelberg Engineering GmbH, Heidelberg, Germany) for depth measurement defined as the distance from the anterior corneal surface to anterior rim of the ring.
The mean age of the 30 participants was 31.4 ± 7.9 years, and 58.6% were male. Mean follow-up time after ring implantation was 25.8 ± 10.0 (range 7-41) months. Mean actual depth was 59.9% (42.4-86.8%), and the target depth was 85.0% (74.8-90.0%) (P < 0.001). The ring was at a depth of less than 70% in 25 eyes of the 30 (83.3%) studied eyes.
The mean 26 months after implantation, ring segments are placed at a shallower depth than originally intended. Therefore, although femtosecond laser technology is an acceptable method for the surgeon, it is necessary to revisit the depth calculator of the device.
比较圆锥角膜患者中使用飞秒激光制作角膜内环植入术（ICRS）隧道的实际深度与目标深度。
在这项混合设计研究中，通过病历审查确定符合条件的圆锥角膜患者。纳入标准为在入组前6个月以上接受过飞秒激光ICRS植入术。参与者使用Spectralis（德国海德堡海德堡工程有限公司）进行眼前节光学相干断层扫描，以测量定义为从角膜前表面到环的前缘的距离的深度。
30名参与者的平均年龄为31.4±7.9岁，58.6%为男性。环植入后的平均随访时间为25.8±10.0（范围7 - 41）个月。平均实际深度为59.9%（42.4 - 86.8%），目标深度为85.0%（74.8 - 90.0%）（P < 0.001）。在30只研究眼中的25只眼（83.3%）中环的深度小于70%。
植入后平均26个月，环段放置的深度比原计划浅。因此，尽管飞秒激光技术对外科医生来说是一种可接受的方法，但有必要重新审视该设备的深度计算器。
