首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 93 毫秒
1.
目的探讨影响LASIK术后患者视觉质量下降的相关因素、以寻求更好的手术设计方案。方法对380例(751眼)接受LASIK手术的近视患者中出现视觉质量下降的35例(70眼)患者进行相关检查分析。结果综合分析与以下因素有关:术前屈光度、瞳孔大小、主视眼转换及激光切削中心偏移、术前是否配戴隐形眼镜。而与视力、眼压无明显相关关系。结论LASIK术后患者的视觉质量与众多因素相关,术前严格检查筛选、针对不同个体进行合理手术设计可明显提高视觉质量。  相似文献   

2.
老视是与年龄相关的进行性眼调节力下降,老视的矫正不仅重视视力,而且要注重视觉质量。研究影响老视眼视觉质量的关键因素有利于寻求矫正老视的有效手段,达到提高视觉质量的目的。本文就人眼视觉质量的评价、非手术因素、人工晶状体植入、传导性角膜成形术及准分子激光手术等对老视眼视觉质量的影响进行综述。  相似文献   

3.
王军 《眼科》2005,14(5):338-339
提高白内障的手术质量,使患者不仅脱盲、脱残,而且能达到理想的视觉质量是白内障复明工作所面临的新的挑战.除了手术设备和手术操作,人工晶状体的材料、设计及功能是决定人工晶状体眼视觉质量的关键所在.评价人工晶状体眼视觉质量不仅包括视力检查,而且需结合对比敏感度、眩光和像差等一系列综合评价指标.为了同时获得较好的远、近视力,植入多焦点人工晶状体是一种有效的方法.  相似文献   

4.
屈光手术和眼前节成像系统的发展大大提高了手术的安全性、有效性、可预测性和稳定性。飞秒激光可用于制作角膜瓣,进行角膜基质内切割,制作角膜基质环植入隧道等。与传统激光切削模式相比,波前像差引导等个性化切削模式能提高患者术后的视觉质量。角膜胶原交联术是一种治疗圆锥角膜的全新方法。有晶状体眼人工晶状体植入术和屈光性人工晶状体置换术对于高度近视和远视的治疗有着重要的临床应用价值。现有的老视手术有助于提高患者的生活质量。本文对各种屈光手术新技术及相关的眼前节成像系统进行了评述,并展望了屈光手术未来的发展趋势,强调了解屈光手术新技术和新设备的重要性,提出应该积极稳妥地推进屈光手术新技术在临床上的应用。  相似文献   

5.
雷蕾  张建华 《眼科新进展》2008,28(3):227-230
随着社会和科技的发展,人们对视觉质量的要求逐渐提高,新技术新方法不断应用于眼屈光手术.但夜间视觉质量问题仍广泛存在,并已引起眼科学者的重视.目前,关于夜间视觉干扰症状的定义、检测方法和手段并未标准化,其相关因素亦在深入研究中.本文对准分子激光角膜屈光术后夜间视觉质量问题进行概述,介绍夜间视觉干扰症状的概念与检测手段、相关因素及其临床处理方法,并提出一系列预防和改进措施.  相似文献   

6.
屈光手术已成为目前矫正屈光不正的常见手术方式之一,现代屈光手术的目的不仅是为了简单地提高视力,还追求视觉质量及手术后光学质量的完美和自然。本述评就各类屈光手术后影响视觉质量的原因、夜间视力障碍的危险因素及影响患者手术后满意度因素等予以分析,并提出选择适合的手术方式、改善切削模式及应用现代更新的各种技术是减少术后视觉不良症状、提高术后视觉质量的有效因素。  相似文献   

7.
随着准分子激光矫正屈光不正手术的发展,如何提高手术后的视觉质量,已经成为新的研究热点。其中角膜非球面性是影响术后视觉质量的一个重要因素,成为准分子屈光手术医师关注的焦点之一。大量研究表明,手术后角膜非球面状态发生明显的变化,由术前的长椭圆形(prolate)演变为术后的扁椭圆形(oblate);非球面改变的直接结果是使角膜的负球差和高阶像差增加。高阶像差的增加导致手术后的对比敏感度较手术前降低,进而影响视觉质量。本文就角膜前表面非球面性参数(Q值)及其相关与不相关因素予以综述。  相似文献   

8.
王玲 《国际眼科杂志》2012,12(12):2319-2321

本文主要综述优势眼测定方法的现状与进展,并介绍了相关优势眼应用研究(优势眼与屈光不正、优势眼与斜视、优势眼与弱视、优势眼与屈光手术、优势眼与利手、优势眼与运动视觉)的进展。  相似文献   


9.
与眼科手术相关的干眼是临床眼科手术后常见的并发症.导致眼科手术后干眼的原因很多,其中手术对眼表上皮细胞与角膜基质神经的损害、手术中液体对泪膜的冲刷、术后局部药物的影响,均是其重要的诱因.与眼科手术相关的干眼应重在预防.眼科医师应对手术相关的干眼进行正确处理,以提高患者眼科手术的质量,同时加强对其发病机制、预防与治疗方面的研究.  相似文献   

10.
LASIK术后视觉质量下降的调查分析及处理   总被引:6,自引:0,他引:6  
目的探讨LASIK术后患者视觉质量下降的临床表现、发生原因、处理方法及效果。方法对650例(1276只眼)LASIK受术者进行问卷调查,对有视觉质量下降主诉的患者进行相关检查,并做相应治疗,随访半年~2年。结果有视觉质量下降的共45例(48只眼),占6.92%。分析与以下因素有关:(1)术后过矫及年龄偏大,占43.75%;(2)大度数散光,占10.42%;(3)手术前后主导眼变换,占20.83%;(4)切削偏心,占4.17%;(5)切削直径过小,占8.33%;(6)高阶像差增加和对比敏感度下降,占12.50%。部分患者症状可自行缓解,部分经过治疗可得以改善。结论LASIK术后视觉质量改变的发生与多种因素有关,其预后与发生原因和治疗有关,规范的手术程序可减少其发生率。  相似文献   

11.
目的:分析木头所致眼外伤的临床特征及治疗。方法:回顾性分析潍坊医学院附属医院眼科中心2018年8~12月眼部木头击伤25例(25眼)。结果:其中闭合性眼外伤者15例,并发症有前房积血、晶状体损伤及睫状体脱离,同时有3种并发症者2例,有2种并发症者2例,仅1种并发症者11例;15例均行晶状体手术,其中睫状体缝合手术者4例,玻璃体切除联合晶状体手术者10例。开放性眼外伤者10例,伤口位于Ⅰ、Ⅱ、Ⅲ区者分别为7例、2例、1例;均行一期清创缝合术,晶状体手术者4例,玻璃体切除手术者2例,玻璃体切除联合晶状体手术者4例。A组并发症的类型与视力受损情况之间差异有统计学意义(P<0.05);B组不同伤口部位与视力受损情况之间差异有统计学意义(P<0.05)。A、B两组术后视力差异有统计学意义(P<0.05)。结论:闭合性眼外伤中随着并发症的增多,视力受损情况明显加重;开放性外伤中伤口部位是影响视力的重要因素,I区伤口者较Ⅱ、Ⅲ区伤口者视力明显较好。开放性外伤视力预后明显差于闭合性外伤。  相似文献   

12.
角膜屈光手术后的患者发生白内障并行人工晶状体置换手术时,如果按常规计算公式选择人工晶状体的度数,往往会在术后产生不同程度的屈光不正,主要来源于角膜屈光力的测算误差和计算公式的误差,以及眼轴长度测量和有效人工晶状体位置计算的准确性降低等方面的原因.因此,对于曾行角膜屈光手术的白内障患者, 术前应运用适当的方法估算角膜屈光力,并正确地选择合适的人工晶状体度数计算公式,从而减少晶状体置换术后引起的屈光误差.  相似文献   

13.
An improved method of indirect biomicroscopic examination of the ocular fundus has been made possible with the use of a + 90 D lens since 1985. Its special optical characteristics make it a very useful instrument. During this study of 220 retinal detachments we compared this instrument with other methods for examining the ocular fundus (Goldmann fundus contact lens, panfundoscope, binocular indirect ophthalmoscope with a 20 D lens). Other uses for the lens are described. This non-contact examining technique provides excellent visualisation, a wide field of vision, and good patient tolerance. The 90 D lens is particularly useful in vitreo-retinal management of retinal detachment both during and immediately after surgery.  相似文献   

14.
目的:通过超声生物显微镜观察高度近视眼透明晶状体置换手术后眼前节结构的变化。方法:对20例36眼以矫正高度近视为目的高度近视患者,行透明晶状体超声乳化吸除联合折叠式人工晶状体植入手术。术前和术后1mo分别应用超声生物显微镜(ultrasound biomicroscopy,UBM)测量前房深度(anterior chamber depth,ACD)、前房角开放距离(angle opening distance,AOD)和前房角开放度数(anterior angle,AA)。结果:患者术后1mo的ACD,AOD,AA与术前相比有显著性差异(P=0.000),术后房角宽度、前房深度明显大于术前;眼轴与术后、术前前房深度的差值呈负相关(r=-0.711,P=0.000)。结论:高度近视患者行超声乳化透明晶状体吸除联合折叠式人工晶状体植入术,术后前房加深,房角增宽,眼轴与术后、术前前房深度的差值呈负相关。  相似文献   

15.
The status of the cornea is crucial to a good outcome with cataract extraction. Preexisting corneal disease must be managed appropriately to get the high quality results that we have come to expect with modern day cataract surgery. It is now more common to perform cataract surgery on patients who have had previous corneal refractive surgery, and in these patients intraocular lens power calculation is more challenging. Complications following cataract surgery and lens implantation that involve the cornea are uncommon because of advances in surgical techniques. Corneal complications can include mechanical or toxic injury of the endothelium, stripped Descemet's membrane, epithelial toxicity and disruption, infectious keratitis, or epithelial ingrowth. Endothelial cell survival after cataract extraction and lens implantation is still the major concern. Healing of the cornea following clear corneal incisions has become more important, as this technique is used more frequently. There are several recent studies looking at the results of clear corneal incisions performed for cataract surgery. Patients with ocular surface disease still require extra lubrication and management of blepharitis to prevent epithelial toxicity at the time of surgery as well as postoperatively. Clear corneal cataract extraction and lens implantation cause minimal disruption of the conjunctiva, allowing cataract surgery to be performed in patients with severe ocular surface disease such as ocular cicatricial pemphigoid. Overall, modern day cataract extraction is very safe for the cornea.  相似文献   

16.

Background

As techniques for cataract surgery have evolved, spontaneous intraocular lens (IOL) dislocation in patients with no ocular pathology arises less frequently. We present seven consecutive cases of uncomplicated cataract surgery with early in-the-bag spontaneous intraocular lens dislocation for which the same type of hydrophilic single piece lens was used.

Material and methods

A retrospective analysis was conducted on seven cases involving patients with IOL dislocation who underwent uncomplicated cataract surgery within a period of 4 months (October 2010 to January 2011) using the same type of single piece IOL. The median age of the 7 patients was 73 years and IOL repositioning was performed after an average of 10 weeks.

Results

Sulcus repositioning could be carried out in only five of the seven patients and IOL repositioning within the capsule was achieved in one patient. A second patient exhibited IOL dislocation after yttrium aluminium garnet (YAG) laser capsulotomy. Explantation of the IOL and sulcus implantation of another IOL type (Acrysof MA50?MB) was necessary for a third patient. A fourth case presented an angled IOL haptic and dislocation of the IOL in the sulcus position.

Discussion

Even after uncomplicated cataract surgery, spontaneous in-the-bag IOL dislocation in patients with no ocular pathology may occur due to a hydrophilic lens material which induces stronger anterior capsular phimosis (ACP) in comparison to alternative materials. In combination with a thin lens design this may result in angled IOL haptics and IOL dislocation.

Conclusions

Careful selection of suitable lens design and material according to individual predisposing factors is necessary. This retrospective case study demonstrates that the combination of hydrophilic lens material and a thin lens design may result in early spontaneous IOL dislocation. Furthermore, as established in one case, YAG laser capsulotomy may induce IOL dislocation if the lens design cannot withstand capsular fibrosis.  相似文献   

17.
L Lim  D T Tan  W K Chan 《The CLAO journal》2001,27(4):179-185
PURPOSE: To evaluate the Bausch & Lomb PureVision contact lens as a continuous wear contact lens for therapeutic indications in a prospective open-ended non-randomized clinical trial. METHODS: Patients with a variety of corneal and ocular surface disease conditions presenting at the Singapore National Eye Centre who required therapeutic continuous contact lens wear were enrolled. Therapeutic indications included pain relief, corneal protection, and enhancement of corneal wound healing. Success or failure of specific treatment indications was assessed in all cases, with evaluation of lens performance and fit characteristics, and the presence of ocular complications or lens-related complications was noted. RESULTS: There were 54 patients (54 eyes), and the mean duration of continuous contact lens wear was 1.1 months. Conditions treated included post-surgical indications (n = 36) (post-keratoplasty or ocular surface transplantation, post-LASIK or PRK surgery) bullous keratopathy (n = 7), chemical burns (n = 3), epithelial abrasions or recurrent corneal erosion syndromes (n = 3), corneal perforations (n = 3), neurotrophic ulcer (n = 1), and corneal laceration (n = 1). For the indication of corneal healing (40 eyes), improved healing was noted in 38 eyes (96%), with full healing occurring in 33 eyes (83%). For pain relief (28 eyes), 27 patients (96%) had considerable or complete pain relief, and the remaining patient reported partial pain relief. For corneal protection (21 eyes), lens wear was fully protective in all cases. The lens performance and fitting characteristics surpassed any previous therapeutic lenses used by the investigators. Complications related to contact lens wear were limited to one case of a culture-negative corneal infiltrate requiring cessation of therapeutic lens wear and one case of a loosely fit lens. CONCLUSIONS: Our results show that the PureVision contact lens exhibits good safety and efficacy when utilized as a continuous wear therapeutic lens. With the theoretical advantage of increased oxygen transmissibility reducing the risk of hypoxia-related complications, this new lens may be one step closer to the ideal therapeutic contact lens. The PureVision contact lens is now our primary bandage lens of choice in our corneal, external disease, and refractive surgery services.  相似文献   

18.
Giant papillary conjunctivitis--a review.   总被引:2,自引:0,他引:2  
First described in 1974 by an Australian ophthalmologist Dr. Spring, Giant Papillary Conjunctivitis (GPC) is one of the external ocular allergic conditions. It is most often associated with contact lens wear, but has also been described in patients with ocular prostheses and corneal sutures following surgery. Diagnosis is usually straightforward. Patients complain of decreasing lens tolerance, mucus production, often severe enough to cause blurred vision, and some itch. Inspection will reveal conjunctival hyperaemia and enlarged tarsal papillae. Management centres around patient education regarding careful lens hygiene but in severe cases may require a change to disposable lenses or a cessation of lens wear. In some cases, pharmacological agents may be required. The histopathology of GPC is very similar to Vernal Keratoconjunctivitis (VKC). It is caused by a complex immunological reaction and is not solely IgE-mediated. Trauma and foreign body reactions also play a role. The incidence of GPC has decreased with the advent of disposable lenses.  相似文献   

19.
We present the case of a 36-year-old male patient who presented with an increasing bilateral loss of vision which had existed for several years. Slit-lamp examination revealed a conical anterior protusion of the lens and funduscopy showed a discreet perimacular dot and fleck retinopathy. In consideration of all clinical findings the patient was diagnosed with anterior lenticonus as an ocular manifestation of an Alport's syndrome which is a rare X-linked disease. Besides renal failure and hearing loss which occur early, ocular changes usually manifest later on. Patients with a anterior lenticonus can be effectively treated with phacoemulsification and intraocular lens implantation. The visual outcome after surgery is excellent.  相似文献   

20.
目的 探讨眼外伤术后无晶状体眼二期人工晶状体植入术前后生存质量的变化及其影响因素.方法 采用于强等开发的视功能损害眼病患者生活质量量表( AQOL - DVI)对眼外伤术后无晶状体眼98例行二期人工晶状体植入手术.对术前2d、术后3个月的生存质量进行比较,以配对t检验,并采用多元逐步回归分析方法筛选影响生存质量的因素.结果 植入术后3个月量表得分明显高于术前2d者,差异具有统计学意义.影响手术后得分改变的首要独立因素是患眼视力的变化.多元回归分析筛选出5个主要影响因子:术后3个月视力(Bs =0.408)、用眼时间(Bs=-0.172)、社会保障(Bs=0.324)、晶状体位置(Bs=-0.216)、术后眩光(Bs=-0.143).结论 二期人工晶状体植入术后眼外伤患者的生存质量得到明显提高.根据术后生存质量的影响因子,不仅要重视患者的单纯的视力提高,同时还要了解患者的职业、经济状况及术后舒适度等.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号