Medennium posterior chamber phakic refractive lens to correct high myopia

PURPOSE: To determine the efficacy and safety of phakic refractive lens implantation to correct high myopia. METHODS: In this prospective study, a phakic refractive lens was implanted in 90 myopic eyes in which refractive errors ranged from -6.00 to -20.00 diopters (D) and laser refractive surgery was contraindicated. Uncorrected visual acuity (UCVA) and best-spectacle corrected visual acuity (BSCVA), manifest and cycloplegic refractions, and intraocular pressure (IOP) were assessed during a 1-year follow-up period. Possible complications, including endothelial cell counts, were evaluated. RESULTS: Spherical equivalent refraction measurements revealed a significant change from the preoperative mean value of -11.90+/-5.00 D to 0.04+/-0.20 D 1 year postoperatively (P=.001). The UCVA and BSCVA significantly improved postoperatively (P=.001 and P=.01, respectively). Seventy-two (80%) eyes and 61 (68%) eyes were within +/-1.00 D and +/-0.50 D of the target refraction, respectively. A significant increase in IOP was found at every postoperative visit (P=.01). There was a trend toward decreased endothelial cell density postoperatively, although the difference did not reach significance. No major complications were found during the 1-year follow-up period. CONCLUSIONS: The implantation of a phakic refractive lens seems to be a predictable and well-tolerated procedure for correcting high myopia. Complications such as development of cataract, implant dislocation, decreases in endothelial cell counts, or development of glaucoma did not occur in this study.     

Malignant glaucoma induced by a phakic posterior chamber intraocular lens for myopia

A 23-year-old woman with -14.00 diopters of myopia requested emmetropia for professional reasons. An ICM 130 V2 myopic phakic intraocular lens (IOL) (Staar Surgical AG) was implanted in the posterior chamber. Three days later, the patient developed malignant glaucoma. Pupillary block glaucoma and choroidal hemorrhage or effusion were ruled out. As maximum medical treatment failed, rapid secondary surgery was performed with sclerotomy, aspiration in the midvitreous cavity, and removal of the IOL. The follow-up was 43 months.     

黏弹剂选择对百康复视伦有晶状体眼人工晶状体的影响

目的观察黏弹剂对百康复视伦有晶状体眼后房屈光晶状体（PC—PRL）植入手术的影响,分析可能的影响因素。设计实验研究。研究对象36只新西兰标准实验兔（36眼）。方法将36只实验动物随机分为6组,每组6只,右眼为手术眼。将两种相同材料的人工晶状体A和B（LA,LB）及三种黏弹剂A,B,C（EA,EB,EC）进行不同组合（LA＋EA,LA＋EB,LA＋EC,LB＋EA,LB＋EB,LB＋EC）植入动物眼内,其中LA＋EA为临床中发生术后人工晶状体后表面混浊的PC—PRL＋HealonGV。手术后1天观察人工晶状体表面混浊情况。术后2天－1周,将裂隙灯观察到发生混浊膜的实验兔处死,手术剥取人工晶状体表面纤维膜,电镜下观察。对于术后发生增生膜的组合,使用人眼房水作为培养基,进行人工晶状体与相应黏弹剂的体外培养,并观察晶状体表面的蛋白沉淀情况。主要指标前房闪光,人工晶状体表面增生膜。结果在动物体内实验中观察到仅在PC—PRL与HealonGV配合使用的动物组,5眼（83．33％）术后发生人工晶状体后表面混浊,与其他组比较差异有统计学意义（χ^2=16．31,P=0．006）。电镜下显示混浊为纤维增生。体外培养各组均未发生该现象。结论PC—PRL与HealonGV在术中共同使用是术后人工晶状体后表面混浊的原因,其机制尚需进一步研究。（眼科,2010,19：93－96）     

有晶状体眼的人工晶状体植入术

目的观察有晶状体眼的人工晶状体（ICL）植入术矫正高度近视的临床效果。方法22例（39只眼）高度近视患者,近视度数-7．00- -23．00 D,平均（-11．48±3．70）D。术前裸眼视力（UCVA）0．02-0．3,平均0．05±0．03,术前最佳矫正视力（BCVA）0．8-1.2,平均0．90±0．27;角膜内皮密度2000-3961个／mm^2,平均（2735．13±464．50）个／mm^2;所有患者随访12个月。结果术后裸眼视力显著提高,术后1d,1周11、3、6和12个月的裸眼视力较之术前差异有统计学意义（P=0．0000）。结论有晶状体眼的人工晶状体植入术治疗高度近视临床效果确切,特别适宜于无法选择角膜屈光手术者,其远期并发症还有待进一步观察。     

有晶状体眼悬浮型后房型人工晶状体植入治疗高度近视

目的观察和探讨悬浮型后房型有晶状体眼人工晶状体（PC-PRL）植入术治疗高度近视的效果及安全性。方法回顾性病例研究。38例（68眼）高度近视患者（近视度为-11.25～-20.00 D）植入PC-PRL。术前及术后1周、1个月、3个月、6个月对患者的视力、眼压、角膜内皮细胞计数、前房深度及PC-PRL位置进行观察。采用重复测量方差分析比较PIOL术后不同时间段的等效球镜的差异。结果术后6个月时,所有患者UCVA均≥4.7,达到或高于术前BCVA（F=6.813,P<0.01）;术后7例（10眼）早期眼压升高,经降眼压治疗后眼压正常;术后前房深度较术前有所下降（F=32.952,P＜0.01）,小梁虹膜水平/垂直夹角、房角开放距离、拱高均无明显变化（P＞0.05）,未见虹膜膨隆,房角阻滞;术后PIOL位置稳定,与晶状体距离稳定。结论PC-PRL植入术治疗高度近视效果确切,预测性好,手术安全。     

Pigmentary dispersion glaucoma secondary to posterior chamber intra-ocular lenses

Thirteen cases of pigmentary dispersion glaucoma are presented. These had in common heavy pigment granule deposition in the trabecular meshwork in the operated eye alone, a history of posterior chamber intra-ocular lens implantation, and mild to marked iris pigment atrophy in areas contingent with or adjacent to the lens. High intra-ocular pressures were usually transient and easily controlled. One, however, eventually required trabeculoplasty.     

Pseudophakic ametropia managed with a phakic posterior chamber intraocular lens

We report the use of a phakic posterior chamber intraocular lens (IOL) to correct pseudophakic ametropia. Two eyes of 2 patients developed ametropia after unilateral phacoemulsification and IOL implantation. The manifest refraction was -6.00 -0.50 x 50 in the first patient and +4.50 -1.00 x 15 in the second. Both patients were bothered by the induced anisometropia and had posterior chamber phakic IOL implantation in the pseudophakic eye. Postoperatively, uncorrected visual acuity improved from 20/400 to 20/30 in the first patient and from 20/200 to 20/40 in the second patient. The manifest refraction was -0.50 -0.75 x 55 and +1.50 -1.50 x 30, respectively. No complications were noted. Implantation of a phakic posterior chamber IOL may be an alternative to currently available methods of managing pseudophakic ametropia.     

有晶状体眼后房屈光晶状体植入术治疗超高度近视的临床疗效

目的：观察有晶状体眼后房屈光晶状体(PC-PRL)植入术治疗超高度近视的临床疗效。

方法：回顾性病例研究。选取2021-01/2022-01于我院行PC-PRL植入术治疗的超高度近视患者36例67眼,按术前球镜度数分成两组：球镜≤-18.00D者16例30眼和球镜>-18.00D 者20例37眼。比较两组患者手术前后视力、眼压、角膜内皮细胞密度(ECD)、中央前房深度(ACD)以及术后拱高、并发症的情况。

结果：两组患者术后3mo UCVA均达到或超过术前BCVA(均P<0.05),且球镜>-18.00D组的视力提高幅度更大(P<0.01); 两组患者术后1d眼压、角膜内皮细胞密度与术前比较均有差异(均P<0.05); 术后不同时间点拱高均呈下降趋势,但均在正常范围内; 术后3mo ACD均低于术前(均P<0.01)。两组间手术前后眼压、ECD、ACD及术后拱高比较均无差异(P>0.05)。两组患者术后均未发生严重并发症。

结论：PC-PRL植入术治疗超高度近视患者早期视力得到良好改善、屈光状态稳定、安全可靠、无严重并发症。     

Long-term refractive outcomes of posterior chamber phakic (spheric and toric implantable collamer lens) intraocular lens implantation

To report the long-term refractive outcomes, safety, predictability, efficacy and complications of 349 eyes treated with posterior chamber phakic intraocular lenses (pIOLs). A retrospective review of consecutive clinical cases of patients who underwent spheric implantable collamer lens (ICL) and toric ICL (TICL) implantation. The study included 349 eyes of 216 patients with sphere between +8 to ?24 diopters (D) and 0 to ?6.5 D of astigmatism. Statistical analysis was performed to identify differences between preoperative and postoperative refractive outcomes. Main outcome measures were preoperative and postoperative uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), spherical and cylindrical errors and spherical equivalent and significant postoperative complications. 194 eyes were treated with TICL and 155 eyes with ICL. The mean age of the patients was 29 ± 6.7 years. The mean preoperative sphere was ?10.35 ± 5.1 D (+8 to ?24) and the postoperative sphere was ?0.09 ± 1.06 D (+3.25 to ?6.5), p < 0.001. Preoperative cylinder was ?2.63 ± 1.44 (0 to ?6.5 D) and postoperative cylinder was ?0.97 ± 0.89 D (0 to ?3.5), p < 0.001. The preoperative mean spherical equivalent was ?11.6 ± 5.12 D (+7.875 to ?25.625) and postoperative spherical equivalent was ?0.52 ± 1.03 (+2.25 to ?6.75), p < 0.001. The mean preoperative UDVA was 1.72 ± 0.49 and postoperative UDVA was 0.23 ± 0.22, p < 0.001. The mean preoperative CDVA was 0.21 ± 0.17 and postoperative CDVA was 0.12 ± 0.138, p < 0.001. The implantation of posterior chamber pIOLs is a safe, predictable and effective strategy to manage refractive errors during long-term follow-up.     

Imaging of posterior chamber phakic intraocular lens by optical coherence tomography

We demonstrate the applicability of optical coherence tomography to visualize the distance between the intraocular lens (IOL) and the lens capsule (lens vault) after implantation of the Staar Collamer posterior phakic IOL, also known as the implantable contact lens (ICL). Maintaining a substantial lens vault may be important to avoid cataract formation, but the lens vault was found to change over time; changes in accommodation and pupil size have also been noted. Optical coherence tomography allows precise assessment of the anatomic relationship between the ICL and the crystalline lens in a noncontact, noninvasive manner, permitting dynamic monitoring of changes in accommodation and pupil size.     

有晶状体眼后房型人工晶状体植入术后的视觉质量

对有晶状体眼后房型人工晶状体植入矫正屈光不正术后患者主观视觉质量（视力、对比敏感度）及客观视觉质量（波前像差、点扩散函数、斯特尔比率及光学传递函数）的研究显示,患者主观视力的提高也伴随着客观视觉质量的改善。对可影响视觉质量的术后并发症如晶状体前囊膜下混浊、青光眼及角膜内皮功能异常等需进一步远期随访。（国际眼科纵览, 2018,  42:   184-188）     

Lens opacities after posterior chamber phakic intraocular lens implantation

PURPOSE: To describe a case series to determine the incidence of lens opacities after posterior chamber phakic intraocular lens (IOL) implantation (STAAR Surgical, Monrovia, CA) for very high ametropias. DESIGN: Retrospective, noncomparative, interventional case series. PARTICIPANTS: Fourteen eyes of 170 consecutive eyes with high ametropias in whom lens opacities developed after posterior chamber phakic IOL implant (PCPIOL). INTERVENTION: Posterior chamber phakic intraocular lens implant. MAIN OUTCOME MEASURES: Lens opacity appearance, localization, and clinical course. RESULTS: Fourteen eyes developed lens opacities 125 +/- 116 days after phakic IOL implant. All eyes had anterior subcapsular opacities, and two eyes also developed nuclear sclerosis. The anterior opacities did not extend posteriorly within the lens, and there were no posterior subcapsular cataracts. Seventy-one percent of opacities were first seen 相似文献   

Tuck-and-pull technique for posterior chamber phakic intraocular lens explantation

The tuck-and-pull technique was developed for practical and safe explantations of posterior chamber phakic intraocular lenses (PCPIOLs). In this technique, after the creation of a side port, viscoelastic (or OVD [ophthalmic viscosurgical device]) is initially injected behind the PCPIOL to widen the space between PCPIOL and the crystalline lens. The old incisions can be used after recent implantations rendering the enlargement of the main incision unnecessary. After additional OVD over and under the PCPIOL, the haptic is tucked by a chopper and pulled through the main incision with a single maneuver. The haptic is grasped by two suture forceps and explanted with a “hand-to-hand” maneuver. The tuck-and-pull technique provided high protection of the corneal endothelium, crystalline lens, anterior chamber structures, and the PCPIOL itself. This technique is a practical, easy, and safe approach for explantations of all PCPIOL types, whatever the reason for its explantation may be.     

有晶状体眼后房型人工晶状体植入术后的视觉质量

对有晶状体眼植入后房型人工晶状体是矫正屈光不正的有效方法,植入的后房型人工晶状体目前主要有可植入式接触镜(implantable contact lens,ICL)和有晶状体眼屈光性晶状体(phakic refractive lens,PRL)。对术后患者主观视觉质量(视力、对比敏感度)、客观视觉质量(波前像差、点扩散函数、斯特尔比率及光学传递函数)的研究显示,主观视力的提高也伴随着客观视觉质量的改善,但部分患者术后出现光晕及眩光症状。本文主要对ICL和PRL植入术后主观及客观视觉质量的临床研究做一综述,对可影响视觉质量的术后并发症如晶状体前囊膜下混浊、青光眼及角膜内皮功能异常等需进一步远期随访。     

The phakic intraocular lens implant: in-depth focus on posterior chamber phakic IOLs

Phakic Intraocular surgery has come a long way in the past 20 years, especially in the evolution of posterior chamber phakic intraocular lenses (PC PIOLs). Clinical trials worldwide are showing acceptable results concerning efficacy, predictability, stability, and safety. PC PIOLS are proving to be a promising option for patients with high and extreme ametropia who cannot benefit from conventional corneal refractive procedures. This article provides an in-depth examination of PC PIOLs, their origin and evolution, and the results of past and current clinical studies. Reports of historical importance and studies published since the 1990s in peer-reviewed journals, textbooks, and monthly eye magazines, as well as Food and Drug Administration preliminary clinical findings, are reviewed. Anterior chamber phakic intraocular lenses are mentioned briefly.