capsulorhexis

Capsulorexis
  • 文章类型: Review
    阿根廷国旗标志(AFS)是白内障摘除过程中令人恐惧的并发症。透镜内压力,尤其是过度的后压力,已被确定为与AFS相关的囊应力和撕裂的潜在机制。囊袋张力是由正的晶状体内压力产生的,一旦开始手动撕囊术,这将导致虹膜透镜光阑向前移动。这种张力可能会导致无意中的眼泪自传播到镜头赤道,造成了AFS,在其他术中并发症中。因此,这篇综述强调了识别膨胀型白内障的重要性,以及减轻预防AFS所需的囊内压力的技术组合.然而,一些前囊撕裂的情况是不可避免的。因此,还将重点放在白内障摘除术期间用于治疗前囊膜撕裂的技术上,减轻对后囊的延伸。
    The Argentinian flag sign (AFS) is a feared complication during cataract extraction. Intralenticular pressures, especially excessive posterior pressure, have been identified as potential mechanisms for capsular stress and tearing associated with AFS. Capsular tension is created by positive intralenticular pressures, which cause the irido-lens diaphragm to move anteriorly once the manual capsulorhexis has been initiated. This tension can cause inadvertent tears that self-propagate to the lens equator, causing an AFS, among other intraoperative complications. Thus, this review highlights the importance of identifying intumescent cataracts as well as a combination of techniques to relieve intracapsular pressures needed to prevent AFS. However, some instances of anterior capsular tears are unavoidable. Therefore, focus will also be placed on techniques during cataract extraction used to manage anterior capsular tears, mitigating extension to the posterior capsule.
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  • 文章类型: Journal Article
    UNASSIGNED:连续曲线撕囊(CCC)已成为前囊切开术的黄金标准技术,现代白内障手术的重要发展。CCC可以更安全和相对方便地进入晶状体,然而,它比旧的方法更具有挑战性的掌握。了解此过程背后的物理原理是实现预期结果和避免并发症的关键。
    UNASSIGNED:为了审查和介绍有关CCC的既定信息,并为白内障手术的这一重要步骤创建实用指南。
    未经评估:使用PubMed进行了文献综述,Embase,Cochrane和Scopus数据库,强调最新的信息。这篇综述的第一部分描述了CCC的演变,并讨论了不同的方法,可用的各种仪器,提示和珍珠和一般设置的最佳结果。下半年涵盖了最近的创新和常见的并发症,以及预防或管理它们的策略。本文对CCC的各个方面进行了实践回顾。
    UNASSIGNED: Continuous curvilinear capsulorhexis (CCC) has become the gold standard technique for anterior capsulotomy, a cardinal development in modern cataract surgery. CCC enables safer and relatively convenient access to the crystalline lens, however it is more challenging to master than older methods. Understanding the physics underlying this procedure is key to achieving the desired results and avoiding complications.
    UNASSIGNED: To review and present the established information about CCC, and to create a practical guide to this important step in cataract surgery.
    UNASSIGNED: A literature review was conducted using PubMed, Embase, Cochrane and Scopus databases, with emphasis on up-to-date information. The first part of this review describes the evolution of CCC and discusses the different approaches, the various instruments available, tips and pearls and the general setup for best results. The second half covers more recent innovations and common complications, and strategies to prevent or manage them. This paper provides a practical review of all aspects of CCC.
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  • 文章类型: Journal Article
    飞秒激光手术的使用提高了角膜切口和囊开口的精度和可重复性;它还减少了晶状体核工作所需的超声能量。到目前为止,报告的并发症发生率似乎很低。有许多禁忌症,如角膜和/或青光眼手术史和某些解剖特征,如深陷的眼睛,后凸畸形,震颤,和肥胖。两种技术的视觉恢复和屈光效果都很好。基于荟萃分析的激光白内障手术(LCS)与手动白内障手术(常规超声乳化术)的比较目前揭示了屈光和视觉结果的微小差异。这两种方法都非常成功和安全。LCS是一种仍在上升的技术,其全部潜力尚未挖掘。
    The use of femtosecond laser surgery improves the precision and reproducibility of corneal incisions and the capsular opening; it also reduces the amount of ultrasound energy required for lens nucleus work-up. The rate of complications reported so far appears to be low. There are a number of contraindications such as a history of cornea and/or glaucoma surgery and certain anatomical features like deep-set eyes, kyphosis, tremor, and obesity. Visual recovery and refractive results of both techniques are excellent. Comparing laser cataract surgery (LCS) with manual cataract surgery (conventional phacoemulsification) based on meta-analysis currently reveals slight differences in refractive and visual outcome. Both methods are extremely successful and safe. LCS is a technique still on the rise, with its full potential not yet tapped.
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  • 文章类型: Case Reports
    Here we present 2 cases of capsule contraction syndrome (CCS). In both cases, a hydrophilic acrylic Akreos MI60 (Bausch and Lomb) intraocular lens (IOL) was implanted in the capsular bag through microincision cataract surgery, and the literature on the subject is reviewed. Since CCS has been described after the implantation of every IOL type, it is unlikely that the Akreos MI60 chemical and physical properties may cause CCS. When CCS occurs with IOLs composed of increasingly flexible materials that are inserted through incisions of decreasing size, a severe dislocation and deformation of IOL optics and haptics may develop. In both cases illustrated here, Nd:YAG laser anterior capsulotomy was highly effective. Hence, also based on the literature, which reports severe complications as a result of surgical intervention, it is suggested that Nd:YAG laser anterior capsulotomy be the first line of CCS treatment when the luxation of an IOL capsular bag is absent.
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  • 文章类型: Journal Article
    OBJECTIVE: To review the published literature describing the use of the LenSx femtosecond laser technology (Alcon Laboratories, Inc., Fort Worth, TX) in cataract surgery.
    METHODS: Literature review.
    RESULTS: The LenSx system has been used in more than 200,000 cataract surgery procedures to date. Pre-clinical evaluations have shown that this system produces accurate and reproducible capsulorhexes, and that both the energy required for phacoemulsification and total phacoemulsification time are less than with conventional phacoemulsification. In comparative studies, femtosecond lasers have been shown to produce more precise and reproducible capsulorhexes than manual procedures, and better intraocular lens placement; capsule overlap, circularity of capsulotomy, and centration of the intraocular lens are consistently better with femtosecond lasers than with manual procedures. The improved quality of capsulorhexis and intraocular lens positioning are reflected in favorable visual and refractive outcomes. As with any new technology, there is a significant learning curve: prospective cohort studies have shown that the incidence of intraoperative complications such as suction breaks or anterior capsular tears or tags decreases with experience. In general, the incidence of such complications is within the range (< 2%) considered in recent evidence-based guidelines to be feasible and desirable.
    CONCLUSIONS: Although femtosecond laser cataract surgery is in its infancy, the technology is evolving rapidly and offers the potential for more consistent and predictable results after cataract surgery.
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  • 文章类型: Journal Article
    Introduced in 2008, the femtosecond laser is a promising new technological advance which plays an ever increasing role in cataract surgery where it automates the three main surgical steps: corneal incision, capsulotomy and lens fragmentation. The proven advantages over manual surgery are: a better quality of incision with reduced induced astigmatism; increased reliability and reproducibility of the capsulotomy with increased stability of the implanted lens; a reduction in the use of ultrasound. Regarding refractive results or safety, however, no prospective randomized study to date has shown significant superiority compared with standard manual technique. The significant extra cost generated by this laser, undertaken by the patient, is a limiting factor for both its use and study. This review outlines the potential benefits of femtosecond-laser-assisted cataract surgery due to the automation of key steps and the safety of this new technology.
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    文章类型: Journal Article
    Hawai\'i has had the first US Food and Drug Administration approved femtosecond laser (LenSx as shown in figure) for cataract surgery since early 2012, a brand new laser technology for modern cataract surgery in Hawai\'i. This article intends to evaluate the cost, safety, efficacy, advantages, and limitations of femtosecond laser-assisted cataract surgery through a review of the literature for the public of Hawai\'i. A search was conducted using keywords to screen and select articles from PubMed. In addition, recent published peer reviewed articles pertinent to the femtosecond laser-assisted cataract surgery were selected and reviewed. Safety and efficacy of femtosecond laser-assisted cataract surgery were demonstrated in the literature, with improvements in anterior capsulotomy, phacofragmentation, and corneal incision. However, there were limitations within these studies which included small sample size and short-term follow-up. In addition, cost-benefit analysis has not yet been addressed. Long-term studies to compare the complication rate and visual outcome between the laser and conventional cataract surgery are warranted.
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  • 文章类型: Journal Article
    为了评估安全性,功效,优势,通过对文献的回顾,以及飞秒激光辅助白内障手术的局限性。使用适合主题的关键字进行PubMed搜索以筛选和选择文章。初步研究表明,飞秒激光辅助白内障手术具有适当的安全性和有效性,随着前囊切开术的改善,Phacofragmentation,和角膜切口。这些研究的局限性包括样本量小和短期随访。成本效益分析尚未解决。飞秒激光辅助白内障手术的初步数据显示了适当的安全性和有效性,与传统白内障手术相比可能有优势。最终要回答的问题包括比较长期术后并发症发生率-包括感染和视觉结果-以及禁忌症和财务可行性的分析。
    To evaluate the safety, efficacy, advantages, and limitations of femtosecond laser-assisted cataract surgery through a review of the literature. A PubMed search was conducted using topic-appropriate keywords to screen and select articles. Initial research has shown appropriate safety and efficacy of femtosecond laser-assisted cataract surgery, with improvements in anterior capsulotomy, phacofragmentation, and corneal incision. Limitations of these studies include small sample size and short-term follow-up. Cost-benefit analysis has not yet been addressed. Preliminary data for femtosecond laser-assisted cataract surgery shows appropriate safety and efficacy, and possible advantage over conventional cataract surgery. Questions to eventually be answered include comparisons of long-term postoperative complication rates-including infection and visual outcomes-and analysis of contraindications and financial feasibility.
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  • 文章类型: Case Reports
    BACKGROUND: Pseudoexfoliation syndrome (PEX) is associated with an increased risk for the development of capsular fibrosis including capsular phimosis. A complete occlusion of the anterior capsular opening is, so far, a rarely reported phenomenon.
    METHODS: Here we report the case of a 75-year-old female patient who suffered from a secondary open-angle glaucoma caused by PEX. Three months after an uneventful cataract surgery with capsulorhexis, phakoemulsification and implantation of a posterior chamber lens (PMMA) the anterior capsular opening of her left eye was completely occluded.
    RESULTS: The patient reported a slow loss of vision (20/40 immediately after cataract surgery to 20/200 at the follow-up visit three months later). The examination revealed a complete closure of the capsulorhexis with thick, central fibrous material. The diameter of the capsulorhexis was extensively diminished. Reopening of the anterior capsular opening utilizing a YAG laser was achieved and visual acuity increased to 20/40. Additionally, the fibrotic, secondary cataract of the posterior capsule was removed, again with a YAG laser, five weeks after the first intervention and, now with a free optical axis, the patient\'s visual acuity increased further to 20/30.
    CONCLUSIONS: The excessive production of fibrosis and the tendency towards a shrinkage of the diameter of the capsulorhexis postoperatively in patients with PEX may lead to a complete occlusion of the capsulorhexis. Even in such extreme cases, the reopening of the anterior and posterior capsule by a YAG laser is possible and, as demonstrated here, leads to a morphologically and functionally satisfying result.
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  • 文章类型: Journal Article
    OBJECTIVE: To evaluate the occurrence of cystoid macular edema (CME) after lens extraction, anterior vitrectomy, and intraocular lens implantation (IOL) in children using angioscopy after administration of oral fluorescein.
    METHODS: Centers in Tamil Nadu, India, and Hong Kong, China.
    METHODS: This study comprised 18 children (28 eyes) who had cataract extraction, posterior capsulorhexis, anterior vitrectomy, and in-the-bag IOL implantation. The presence of CME was evaluated 1 week and 4 to 6 weeks after surgery using fluorescein angioscopy.
    RESULTS: Anterior chamber fibrin occurred in 4 eyes (14.3%). Fluorescein angioscopy was performed 1 week after surgery in all eyes and after 1 month in 25 eyes (89.3%). No eye demonstrated the presence of CME on fluorescein angioscopy.
    CONCLUSIONS: Cystoid macular edema did not occur in the early period after pediatric cataract surgery using current surgical techniques. Longer follow-up is required to ascertain the incidence of CME in the late postoperative period.
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