亲水性丙烯酸酯折叠式人工晶状体的临床疗效研究

目的探讨亲水性丙烯酸酯折叠式人工晶状体(intraocular lens,IOL)的临床疗效.方法将214只眼随机分为两组,试验组(114只眼)植入亲水性丙烯酸酯折叠式IOL;对照组(100只眼)植入聚甲基丙烯酸甲酯(polymethylmethacrylate,PMMA)一体型IOL.观察手术前、后视力,角膜曲率和角膜内皮细胞密度的变化.术后3个月散大瞳孔观察119只眼IOL的位置和晶状体后囊膜的混浊情况.对两组结果进行统计学分析.结果术后早期视力、3个月后手术性散光度数、晶状体后囊膜混浊的发生率、IOL位置试验组均优于对照组,差异有显著性(P＜0.05);术后3个月角膜内皮细胞的损失率和矫正视力两组比较,差异无显著性(P＞0.05).结论亲水性丙烯酸酯折叠式IOL生物相容性好,术中便于植入及固定,术后炎性反应轻、恢复快,临床应用效果满意.     

不同材料的人工晶状体植入术后的临床疗效观察

目的　评价超声乳化白内障吸出联合不同材料制成的人工晶状体植入术治疗白内障的疗效。方法　将 14 5例(14 8眼 )行超声乳化白内障吸出联合人工晶状体植入术的患者分为 3组 ,术中随机植入PMMA人工晶状体、新型疏水性丙烯酸酯类、硅凝胶类折叠式人工晶状体。比较术前和术后视力、散光情况。统计术后晶状体后囊膜混浊情况及行Nd :YAG激光后囊膜切除术的情况。结果　术后早期视力、3个月后散光度数、晶状体后囊膜混浊发生率及行Nd :YAG激光后囊膜切除术的情况 ,植入折叠式人工晶状体者均优于植入非折叠式人工晶状体者。植入Canonstaar硅凝胶类折叠式人工晶状体组术后散光最小。植入AcrysofTM新型疏水性丙烯酸酯类折叠式人工晶状体组术后晶状体后囊膜混浊发生率及行Nd :YAG激光后囊膜切除术的比例最低。结论　超声乳化白内障吸出联合折叠式人工晶状体植入的临床应用效果满意。     

国产疏水性丙烯酸酯人工晶状体的安全性与有效性研究

目的 探讨国产疏水性丙烯酸酯人工晶状体(intraocular lens,IOL)的安全性与有效性.方法 采用前瞻性的随机对照临床试验的方法,实验组植入国产疏水性丙烯酸酯IOL(FV-60A),对照组植入美国Alcon公司产疏水性丙烯酸酯IOL(Acrysof,SA60AT),实验组与对照组各20眼.术后1 d、1周、1个月、6个月分别观察记录患者的视力、前房反应和囊膜混浊的情况,进行两组间的比较.结果 术后半年内,两组患者在术后视力、角膜水肿、角膜后沉积物、前房闪辉、前房细胞、晶状体前囊膜纤维化、撕囊边缘覆盖人工晶状体表面膜的生长程度及后囊膜混浊方面的差异均无统计学意义(P＞0.05).结论 国产疏水性丙烯酸酯IOL FV-60A的安全性与有效性均较好,临床使用时与Acysof SA60AT具有等效性,而术后远期后发性白内障的发生情况尚有待进一步随访.(中国眼耳鼻喉科杂志,2007,792～93)     

超声乳化术后联合及不联合人工晶状体植入术建立后囊膜混浊兔眼模型的比较

背景后发性白内障（PCO）的防治是目前研究的热点问题之一。建立PCO动物模型常用的方法为超声乳化术后植入或不植入人工晶状体（IOL）,但二者造模的效果评价尚不一致。目的比较兔眼PCO模型建立过程中植入与不植入IOL对PCO的影响。方法选择新西兰白兔20只,用随机数字表法将实验动物分为超声乳化联合IOL植入组和超声乳化不植入IOL组,每组10只兔,两组兔右眼超声乳化手术过程一致,术后共随访3个月,裂隙灯下观察2个组术后晶状体的反应及PCO情况,按OdrichPCO分级系统对术眼PCO情况进行分级。结果术后1～3d,超声乳化联合IOL植入组术眼结膜充血、角膜水肿和房水混浊的严重程度均明显比超声乳化不植入IOL组严重,而术后2周至3个月2个组兔眼的炎性反应均消失;术后1d至3个月,2个组兔术眼的瞳孔直径变化及PCO分级一致。术后2个月,超声乳化不植入IOL组及超声乳化联合IOL植入组兔眼1～3级PCO者分别为8只眼和9只眼,0级PCO者分别为2只眼和1只眼,组间差异无统计学意义（P=0．39）。裂隙灯下检查发现2个组实验眼均于术后1个月开始出现PCO,术后2个月PCO的范围扩大并快速发展,术后3个月形成致密纤维化层。结论采用超声乳化联合IOL植入术建立PCO模型的效果与不植入IOL者相同,但后者术后早期的前房炎性反应较轻,可作为研究PCO的理想动物模型。     

不同人工晶体材料及设计方式对兔眼后囊混浊影响的实验研究

目的 对比3种不同材料及设计的人工晶体对兔眼晶状体后囊混浊的影响.方法 将实验动物48只随机分成A、B、C、D4个组,超声乳化摘除术后在囊袋内分别植入不同的人工晶体.A组植入三片式聚甲基丙稀酸甲酯(PMMA)材料、光学部边缘为圆形设计的人工晶体;B组植入三片式硅胶(Silicon)材料、光学部边缘也为圆形设计的人工晶体;c组植入丙烯酸酯(Acrylic)材料、光学部边缘为直角方型侧缘设计的人工晶体,D组作为空白对照组只行超声乳化晶体摘除术,未植入人工晶体.术后1 d、1周、1月、3月分别进行了术眼的裂隙灯检查及照像、术后3月行病理及电镜检查.结果 术后第1天,(1)前节炎症反应:A、B、C、组瞳孔区都有膜形成.角膜轻度水肿,D组瞳孔区未见膜形成,角膜轻度水肿.术后1周时A、B、C组前房闪光阳性,三组瞳孔区渗出膜均较前吸收,D组前房闪光消失,A、B、C组后囊膜清亮,D组(空白对照组)后囊膜已有明显混浊.术后1月时,A、B组瞳孔区渗出膜仍未完全吸收,前房闪光均阳性.C组瞳孔区渗出膜完全吸收.前房闪光消失.(2)后囊膜及人工晶体在囊袋内位置情况:术后1月A、B组中央视区后囊膜轻度混浊,并发现2组中各有10只眼人工晶体在囊袋内偏位和囊膜夹持.C组后囊膜清亮,有2只眼发生了囊膜夹持,其余10只眼的人工晶体在囊袋内具有良好的居中性,D组(空白对照组)后囊膜已完全混浊.术后3月时,A、B组中央视区后囊膜混浊情况相似,均较前更加明显,C组只有2例中央视区后囊膜有轻度的混浊,其它10例术眼均保持清亮.结论 C组单片式丙烯酸酯材料、光学部边缘为直角方型侧缘的人工晶体,可能对减少后囊膜混浊的发生,维持人工晶体正位有积极重要的作用.     

汉防己甲素抑制兔晶状体后囊膜混浊

目的 探讨汉防己甲素对白内障摘除术后晶状体后囊膜混浊形成的影响及其作用机制。方法 对48只实验兔行单眼囊外晶状体摘除及人工晶状体植入术。术前随机分为A组对照、B组术后结膜下注射地塞米松、C组术后结下注射汉防己甲素和D组术中植入汉防己甲素镀膜人工晶状体。术后不同时间检测各组术眼的房水细胞数、蛋白质和丙二醛含量,记录晶状体后囊膜混浊程度和湿重。结果 除术后14d房水丙二醛含量外,囊外晶状体摘除术后不同时间4个组的房水细胞数、蛋白质和丙二醛含量,以及晶状体后囊膜混浊的程度和湿重差异均有显著意义（P＜0．05）。其中B和C组术后不同时间房水细胞数、蛋白质和丙二醛含量均低于A组,差异有显著意义（P＜0．05）;B、C和D组术后不同时间晶状体后囊膜混混的程度和湿重均低于A组,差异有显著意义（P＜0．05）。结论 防汉己甲素可有效抑制兔眼晶状体摘除术后晶状体后囊膜混浊的形成;其最佳用药剂量和途径尚需深入探讨。     

Akreos Adapt亲水性丙烯酸酯与硅凝胶人工晶状体临床应用比较

目的比较亲水性丙烯酸酯人工晶状体(intraocularlens,IOL)与硅凝胶IOL的临床效果。方法对209例(209眼)白内障患者行超声乳化吸除联合人工晶状体植入术,A组(93眼)植入亲水性丙烯酸酯Akreos Adapt IOL,B组(116眼)植入SoFlex SE三体型硅凝胶IOL。观察两组IOL的植入性能、术中并发症、术后视力、前房反应和IOL表面色素沉着、IOL位置、后囊混浊程度,随访时间>12个月。结果术后最佳矫正视力两组差异无统计学意义(χ2=0.28,P>0.05)。两组前房闪辉均较轻(+~++)。IOL表面沉积物的发生率:A组3眼(占3.26%),B组13眼(占11.21%),差异有统计学意义(P<0.05)。术中并发症:Akreos Adapt组无异常情况,SoFlexSE三体型硅凝胶组发生IOL襻变形2例,襻脱落1例。术后并发症:Akreos adapt组发生1例IOL脱位入玻璃体腔中,该患者术中后囊破裂,IOL植入睫状沟内,于术后第1个月IOL脱入玻璃体腔中,其余植入囊袋内的Akreos Adapt IOL未发生移位,居中性良好。SoFlex SE组发生1例IOL襻移位入前房内,...     

前段玻璃体切割联合Cionni张力环在伴有前房玻璃体脱出的外伤性晶状体半脱位手术中的应用

目的 探讨应用前段玻璃体切割、囊袋拉钩联合Cionni改良张力环(Cionni-modified capsular tension ring,MCTR)在伴有前房玻璃体脱出的外伤性晶状体半脱位手术中的有效性和安全性.方法 伴有前房玻璃体脱出的外伤性晶状体半脱位患者16例(16眼),脱位范围在90°～ 120°7眼、＞120°～180°5眼、＞180°～ 270°4眼,其中合并虹膜根部离断3眼、express植入1眼、青光眼瓣膜阀植入1眼.根据前房玻璃体情况,行曲安奈德染色后经前房或睫状体平坦部行玻璃体切割术,连续环形撕囊后使用2～4个囊袋拉钩钩住撕囊边缘,稳定晶状体囊袋并使其居中,超声乳化白内障吸出、MCTR植入及巩膜层间缝合固定,晶状体囊袋内植入折叠人工晶状体(intraocular lens,IOL).术后随访3个月,观察术后视力、术中术后并发症、前囊口、IOL位置、眼压情况.结果 所有患者均顺利完成白内障吸出、MCTR及IOL植入;其中植入双钩MCTR 7眼,单钩9眼.术后视力＞0.5者9眼,＞0.3 ～0.5者4眼,＞0.1 ～0.3者2眼,≤0.1者1眼,术后术眼最佳矫正视力与术前比较,差异有统计学意义(x2=17.503,P=0.000).Pantacam眼前段分析系统获得Scheimpflug图像分析IOL居中性好,无MCTR及IOL移位等并发症发生.术中术后并发症有皮质残留、房水后部返流综合征、前囊撕裂、前囊口收缩、后囊膜混浊等.结论 有效前房或睫状体平坦部玻璃体切割是减少手术并发症的关键,前段玻璃体切割、囊袋拉钩联合Cionni张力环植入是伴有前房玻璃体脱出的外伤性晶状体不全脱位较理想的术式选择.     

糖尿病患者白内障超声乳化吸出人工晶状体植入疗效分析

目的:探讨糖尿病患者白内障超声乳化吸出(phaco)及人工晶状体(IOL)植入的手术效果。方法:对46例(56眼)糖尿病患者行白内障超声乳化吸出人工晶状体植入术,观察术中、术后并发症及术后视力的情况。结果:术后视力≥0.5者46眼(82.1%),术后并发症:角膜内皮水肿、前房纤维渗出、人工晶状体表面色素沉着、后囊膜混浊,与同期非糖尿病患者比较差异无显著性。结论:对于糖尿病患者只要术前血糖控制在相对稳定的水平上进行白内障超声乳化吸出及人工晶状体植入术疗效是安全有效的,术后并发症少,视力恢复好。     

肝素表面处理人工晶状体在并发性白内障手术中应用疗效观察

目的探讨肝素表面处理人工晶状体在并发性白内障患者手术中应用的疗效。方法106例(152只眼)并发性白内障患者中随机抽取98只眼为研究组(A),植入HQ-201HEP型肝素表面处理人工晶状体;54只眼为对照组(B),植入MA-60MB型人工晶状体。比较术后视力、眼压、前房闪辉、房水细胞、虹膜后粘连、后囊膜混浊等结果。结果研究组(A)中98只眼有前房闪辉30只眼(30.6%),房水细胞阳性26只眼(26.5%),虹膜后粘连17只眼(17.3%),后囊膜混浊2只眼(2.04%),高眼压2只眼(2.04%)。而对照组(B)54只眼有前房闪辉42只眼(77.8%),房水细胞阳性43只眼(79.6%),虹膜后粘连24只眼(44.4%),后囊膜混浊7只眼(12.7%),高眼压6只眼(11.1%)。结论临床研究发现肝素表面处理人工晶状体在减轻眼内炎症反应、异物反应、细胞在人工晶状体表面沉着(前房闪辉、房水细胞、虹膜后粘连、后囊膜混浊)等方面优于对照组,尤其对于有葡萄膜炎病史、青光眼术后、局部和全身应用类固醇激素者尤为适合,可减轻高眼压和前房出血的发生。     

Intraocular lens implantation in phakic rabbit eyes

Three sizes (13.5 mm, 17.5 mm, and 18.5 mm) of open loop, one piece, poly(methyl methacrylate) anterior chamber intraocular lenses (IOLs) were implanted in 12 phakic rabbit eyes to evaluate the effect of the IOL on the crystalline lens and the anterior chamber. Six eyes were used as a control group. Minimum follow-up was four weeks. All the IOLs touched the crystalline lenses, and on the first postoperative day, round subcapsular lens opacities were found in all eyes in the area of IOL contact. The lens opacities became more dense with time. Only one eye in the control group showed a subcapsular opacity, which was linear rather than round. Anterior chamber inflammation was 1+ to 2+ in ten eyes (80%) in the IOL group during the first and second weeks, whereas minimal inflammatory changes occurred in the control group. These results suggest that with current IOL technology, IOL insertion in the phakic eye to correct refractive errors results in a high incidence of cataract if IOL-to-lens touch occurs.     

The effects of three-piece or single-piece acrylic intraocular lens implantation on posterior capsule opacification

PURPOSE: To evaluate the development of posterior capsule opacification (PCO) in patients implanted with 5.5 mm optics, single-piece or three-piece acrylic intraocular lens (IOL) in cataract surgery prospectively. METHODS: This study was carried out on 267 eyes of 249 patients implanted with three-piece, 5.5 mm optics, acrylic IOL and 252 eyes of 244 patients implanted with single-piece, 5.5 mm optics, acrylic IOL by phacoemulsification technique between September 2001 and February 2003. A total of 519 eyes of 493 patients were prospectively evaluated for PCO development during the 25-month period. All the patients were analyzed periodically with anterior segment retroillumination photography. The data provided were analyzed with chi-square method. RESULTS: The results between the two groups for PCO development were not statistically significant. However, there was a prominent opacification of the posterior capsule where the optic and haptic junction of IOL was positioned in some patients implanted with single-piece IOL. During the follow-up period, no patients implanted with either three-piece or single-piece acrylic IOL required Nd:YAG laser capsulotomy. CONCLUSIONS: Biocompatibility and reduced rate of PCO development are among the leading features of new generation IOLs. The intracapsular implantation of 5.5 mm optics acrylic IOLs resulted in decreased incidence of PCO and therefore greater patient satisfaction. Further studies investigating the effects of IOL optics, haptic structure and length, capsulorrhexis size, and IOL material and design features on PCO development will clarify the subject.     

Results of hydrophilic acrylic,hydrophobic acrylic,and silicone intraocular lenses in uveitic eyes with cataract: comparison to a control group

PURPOSE: To evaluate the uveal and capsular biocompatibility of hydrophilic acrylic, hydrophobic acrylic, and silicone intraocular lenses (IOLs) in eyes with uveitis. SETTING: Department of Ophthalmology, University of Vienna, Vienna, Austria. METHODS: This prospective study comprised 72 eyes with uveitis and 68 control eyes having phacoemulsification and IOL implantation by 1 surgeon. Patients received 1 of the following IOLs: foldable hydrophilic acrylic (Hydroview, Bausch & Lomb), hydrophobic acrylic (AcrySof, Alcon), or silicone (CeeOn 911, Pharmacia). Postoperative evaluations were at 1, 3, and 7 days and 1, 3, and 6 months. Cell reaction was evaluated by specular microscopy of the anterior IOL surface and the anterior and posterior capsule reaction, by biomicroscopy. RESULTS: Small round cell deposition was observed on all IOLs in the immediate postoperative period, especially in eyes with uveitis. This reaction decreased 3 to 6 months after surgery. Although the CeeOn 911 had a higher mean grade of small cells, there was no statistical difference between the 3 IOL types after 6 months in the uveitis and control groups. Foreign-body giant cells (FBGCs) increased after 1 week to 1 month. The AcrySof IOLs had the highest number of FBGCs; after 6 months, there was a statistically significant difference between the AcrySof and Hydroview uveitis groups (P =.036) and the AcrySof and CeeOn 911 uveitis groups (P =.003) but there was no difference among the 3 IOL types in the control group. Lens epithelial cell outgrowth persisted on the Hydroview IOLs in control eyes and regressed on all 3 IOL types in uveitic eyes and on the AcrySof and CeeOn 911 IOLs in control eyes (P =.0001). Anterior capsule opacification (ACO) was more severe on all IOL types in uveitic eyes and on the CeeOn 911 IOL in control eyes. Posterior capsule opacification (PCO) was more severe in uveitic eyes. The Hydroview group had more severe PCO than the AcrySof and the CeeOn 911 groups in uveitis and control eyes. Six months postoperatively, the difference was significant (P =.0001). There was no significant difference between the AcrySof and CeeOn 911 IOLs. CONCLUSIONS: Intraocular lens biocompatibility is inversely related to inflammation. Hydrophilic acrylic material had good uveal but worse capsular biocompatibility. Hydrophobic acrylic material had lower uveal but better capsular biocompatibility. Silicone showed a higher small cell count (mild) and more severe ACO but achieved PCO results comparable to FBGC results and better than those with the AcrySof lens 6 months after surgery. Despite the differences in IOL biocompatibility, all patients benefited from the surgery.     

Capsular bag opacification after experimental implantation of a new accommodating intraocular lens in rabbit eyes

PURPOSE: To evaluate the development of capsular bag opacification in rabbit eyes after implantation of an intraocular lens (IOL) designed to minimize contact between the anterior capsule and the IOL and ensure expansion of the capsular bag. SETTING: David J. Apple, MD Laboratories for Ophthalmic Devices Research, John A. Moran Eye Center, University of Utah, Salt Lake City, Utah, USA. METHODS: Ten New Zealand white rabbits had a study IOL (new accommodating silicone IOL [Synchrony, Visiogen, Inc.]) implanted in 1 eye and a control IOL (1-piece plate silicone IOL with large fixation holes) implanted in the other eye. Intraocular lens position, anterior capsule opacification (ACO), and posterior capsule opacification (PCO) were qualitatively assessed using slitlamp retroillumination photographs of the dilated eyes. Anterior capsule opacification and PCO were graded on a 0 to 4 scale after the eyes were enucleated (Miyake-Apple posterior and anterior views after excision of the cornea and iris). The eyes were also evaluated histopathologically. RESULTS: The rate of ACO and PCO was significantly higher in the control group. Fibrosis and ACO were almost absent in the study group; the control group exhibited extensive capsulorhexis contraction, including capsulorhexis occlusion. Postoperative IOL dislocation into the anterior chamber and pupillary block syndrome were observed in some eyes in the study group. CONCLUSIONS: The special design features associated with the study IOL appeared to help prevent PCO. Complications in the study group were probably caused by the increased posterior vitreous pressure in rabbit eyes compared to human eyes and the relatively large size of the study IOL relative to the anterior segment of rabbit eyes.     

Polylactide-glycoli acid and rapamycin coating intraocular lens prevent posterior capsular opacification in rabbit eyes

Objectives  Posterior capsular opacification (PCO) is caused by the proliferation and migration of residual lens epithelium cells (LECs) after extracapsular cataract extraction (ECCE). Rapamcin (RAPA) is known to be a potent immunosuppressive drug with anti-inflammatory and anti-proliferative effects. The aim of this study was to investigate the safety and efficacy of rapamycin sustained release from modified intraocular lens (IOLs) in the prevention of PCO in rabbits. Methods  Three types of IOLs were used, including the original IOL without modification, IOL with polylactide-glycoli acid (PLGA) coating (PLGA-IOL), and RAPA-loaded PLGA-IOL (RAPA-PLGA-IOL). Sixty New Zealand albino rabbits undergoing phacoemulsification in left eyes were randomly and equally divided into three groups. Group A was implanted with the original IOLs, group B was implanted with the PLGA-IOLs, and group C was implanted with the RAPA-PLGA-IOLs. All of the 60 treated left eyes were examined by a slit-lamp microscope. The concentrations of RAPA in the aqueous humor and blood were determined by high-performance liquid chromatography (HPLC), indicating an vivo release of drug from the polymer carrier. Anterior segment tissue was histologically examined, and wet posterior capsules were weighed. Six months after intervention the PCO was graded. Results  The mean concentrations of RAPA in the aqueous humor from group C at 2 h, 1 days, 3 days, and 7 days after operation were 12.81 ± 1.27 μg/ml, 14.57 ± 0.99 μg/ml, 6.39 ± 0.95 μg/ml, and 1.10 ± 0.32 μg /ml respectively. The concentrations of RAPA in blood were undetectable. During the early days after the operation, the reactions of the anterior chamber from groups A and B were more severe than from group C. Our findings showed that the initial appearance of PCO in group C was much later than in the other two groups. The wet posterior capsules were weighed to be 0.3735 ± 0.0943 g (group A), 0.3754 ± 0.1093 g (group B), and 0.0432 ± 0.0089 g (group C). Histological observation showed a similar phenomenon, that there was remarkably less accumulation of lens materials on the posterior capsules in group C than in the other two groups. Conclusion  Our findings suggest that the designed RAPA-PLGA-IOL effectively prevented formation and development of PCO for a relatively long duration.     

Comparison of the biocompatibility of 2 foldable intraocular lenses with sharp optic edges.

PURPOSE: To compare the clinical performance of 2 foldable intraocular lenses (IOLs) with sharp optic edges in terms of uveal and capsular biocompatibility. SETTING: Department of Ophthalmology, University Hospital of Vienna, Vienna, Austria. METHODS: Fifty eyes scheduled for cataract surgery were included in this comparative study. A standardized surgical protocol was used, and all operations were performed by 1 experienced surgeon. Two posterior chamber lens types of similar design with a 6.0 mm sharp-edged optic and poly(methyl methacrylate) haptics were used. Twenty-five eyes received an AcrySof acrylic IOL (Alcon), and 25 eyes received a CeeOn 911A silicone IOL (Pharmacia). Relevant data were collected at a 3-year follow-up examination. To evaluate uveal biocompatibility, anterior chamber laser flare and cell measurements and inflammatory cell reactions were monitored. Cellular biocompatibility was investigated by examining anterior capsule opacification (ACO), posterior capsule opacification (PCO), and lens epithelial cell (LEC) ongrowth on the IOL's anterior surface. Factors such as intralenticular glistenings and IOL decentration were also evaluated. RESULTS: Anterior chamber flare and cells and the inflammatory cell reaction were significantly lower in the CeeOn 911A group. There was no statistically significant difference in ACO, PCO, and LEC ongrowth between the 2 groups. The AcrySof lenses showed significantly better centration and a higher density of intralenticular glistening. CONCLUSIONS: The findings show that a sharp-edged optic design is, to date, the most effective method of reducing the rate of PCO. Despite a subclinical foreign-body reaction in the AcrySof group, both lenses had a high degree of capsular and uveal biocompatibility.     

环形撕囊及人工晶状体因素对后囊浑浊的影响

目的　分析前囊连续环形撕囊及人工晶状体因素对后囊浑浊的影响。方法　由同一手术者完成的超声乳化吸出人工晶状体植入术的老年性白内障 12 9例 ( 186眼 ) ,随访 2年 ,半定量观察后囊浑浊及其对视力的影响。结果　撕囊的边缘未完全与人工晶状体光学部接触者 ,后囊浑浊的发生率较高 ,(P <0 0 0 0 5 ) ;撕囊游离边缘完全位于光学部者 ,直角边缘的人工晶状体 ,可以更好的预防后囊浑浊 (P <0 0 0 0 5 )。而同为直角边缘 ,丙烯酸和硅凝胶的人工晶状体 ,对后囊浑浊的影响不明显 (P <0 0 0 0 5 )。结论　撕囊的游离缘均匀覆盖人工晶状体光学部周边 0 5～ 0 7mm。同时 ,选择直角边缘的人工晶状体可以有效地减少后囊浑浊的发生 ,而光学部的材料对后囊浑浊的影响甚小     

氟-肝素表面修饰的人工晶状体植入猕猴眼内的实验研究

目的 评价经氟－肝素表面修饰的人工晶状体（ｉｎｔｒａｏｃｕｌａｒ ｌｅｎｓ,ＩＯＬ）在猕猴眼内的生物相容性。方法 将１３只猕猴（２６只眼）随机分为３组,分别植入经不同表面修饰及未经修饰的ＩＯＬ。于术后第１５、３０、６０、９０、１８０天行裂隙灯、检眼镜及眼压检查,并进行前房穿刺,做房水细胞计数。结果 氟－肝素表面修饰的ＩＯＬ在猕猴眼内引起的炎症反应程度较未做表面修饰的ＩＯＬ轻;后囊混浊程度较其它ＩＯ     

Effect of expandable full-size intraocular lenses on lens centration and capsule opacification in rabbits

PURPOSE: To study the effects of expandable, hydrogel, full-size lenses (FSLs) on lens centration and posterior capsule opacification (PCO) in the rabbit model. SETTING: Center for intraocular Lens Research, Storm Eye Institute, Medical University of South Carolina, Charleston, South Carolina, USA. METHODS: Small FSLs designed for human eyes were implanted unilaterally in 20 rabbit eyes. Lens centration and PCO in these eyes were compared with those in eyes with conventional poly(methyl methacrylate) (PMMA) intraocular lenses (IOLs) or aphakia in the fellow eyes. In a second experiment, medium-size or large FSLs designed for rabbit eyes were implanted in 20 rabbit eyes and the results compared with those in eyes with conventional PMMA IOLs. Slitlamp examination of all eyes was performed regularly, after enucleation, gross inspection and microscopic studies were performed. RESULTS: Decentration of FSLs occurred in the presence of an anterior capsule tear or very large capsulorhexis. Posterior capsule opacification developed only at sites where the implanted lens was not in contact with the capsule. Aphakic eyes and looped IOLs developed Soemmering's rings peripherally. In eyes with small FSLs, PCO developed between the lens and the center of the posterior capsule, whereas in eyes with large FSLs, only small amounts of central PCO developed. Retained high-viscosity viscoelastic material had no effect on PCO development. CONCLUSIONS: Complete refilling of the capsular bag by a full-size IOL was associated with excellent centration and only a small degree of PCO. Elastic lenses may thus serve as a starting point for the development of an artificial lens with accommodative function.     

Contact between 3 phakic intraocular lens models and the crystalline lens: an anterior chamber optical coherence tomography study

Three phakic intraocular lens (IOL) models were implanted in 3 different patients. With the usual slitlamp examination, it was not possible to determine whether there was contact between the IOLs and the natural crystalline lens. Using the anterior chamber optical coherence tomography (AC OCT) scanner, direct contact between the natural crystalline lens and the 3 phakic IOLs was revealed. A dynamic study of the contact was performed during accommodation. These observations show that examination of the anterior segment with the AC OCT scanner provides new data about the status of the anterior segment after implantation of phakic IOLs.