Comparative performance of intraocular lenses in eyes with cataract and uveitis

PURPOSE: To evaluate the postoperative outcomes in uveitic eyes after phacoemulsification and posterior chamber intraocular lens (IOL) implantation. SETTING: Multicenter (19) international study. METHODS: This prospective randomized comparative interventional case series comprised 140 eyes of 140 patients who had phacoemulsification and implantation of IOLs of various materials: hydrophobic acrylic (n = 48), silicone (n = 44), poly(methyl methacrylate) (PMMA) (n = 26), or heparin-surface-modified PMMA (HSM PMMA) (n = 22). Preoperative and postoperative grading and control of intraocular inflammation were performed. Clinically significant observations, visual outcomes, and the incidence of postoperative complications were recorded. RESULTS: At the final follow-up, 64 eyes (46.3%) had a best corrected visual acuity of 20/40 or better, an improvement that was highly significant (P <.0001). One day after surgery, the acrylic group had the lowest inflammation values and the silicone group the highest (P =.02). The acrylic group continued to have the lowest inflammation grade values until the 3-month follow-up. The acrylic and HSM PMMA groups had the lowest incidence of relapses. Posterior capsule opacification developed in 48 eyes (34.2%), with the highest incidence in the silicone group. CONCLUSIONS: Phacoemulsification with IOL implantation in selected uveitic eyes was safe and effective. Acrylic IOLs provided a better visual outcome and lower complication rate than IOLs of other materials.     

Decentration and tilt: silicone multifocal versus acrylic soft intraocular lenses

PURPOSE: To compare differences in decentration and tilt between a silicone multifocal and an acrylic intraocular lens (IOL) by evaluating postoperative changes. SETTING: Department of Ophthalmology, College of Medicine, The Catholic University of Korea, Seoul, Korea. METHODS: Forty eyes of 20 patients with IOL implantation were randomized into 2 groups according to IOL type: 3-piece silicone multifocal IOL or 3-piece acrylic IOL. All lenses were implanted in the capsular bag through a clear corneal incision after continuous curvilinear capsulorhexis and phacoemulsification. The amount of the decentration and the degree of the tilt of each IOL were measured using the EAS-1000 anterior eye segment analysis system 1 day and 1 and 2 months after surgery. RESULTS: No significant difference in decentration and tilt was found among the 3 follow-ups or between lens types. CONCLUSION: Neither IOL decentration nor tilt showed significant progression up to 2 months in eyes with a silicone multifocal or acrylic IOL when the IOLs were placed properly in the capsular bag. The amount of decentration and tilt was similar between lens types.     

青光眼白内障联合术植入不同材料人工晶状体效果评价

目的比较青光眼白内障联合术中植入不同材料人工晶状体（IOL）的临床效果。方法回顾性分析行青光眼白内障联合术70例（76眼），其中植入PMMA IOL30例（36眼），硅胶IOL23例（23眼），丙烯酸酯折叠IOL17例（17眼）。对治疗效果进行评价，平均随访期限为10．5月。结果3组间术后眼压和最佳矫正视力差异无统计学意义。前房纤维素样渗出物和IOL表面沉积物发生率，硅胶组高于PMMA组和丙烯酸酯组，但差异无统计学意义。后发障发生率，丙烯酸酯组和硅胶组显著低于PMMA组，差异有统计学意义。结论行青光眼白内障联合术植入PMMA，硅胶与丙烯酸酯IOL在降眼压和提高视力方面具有相似的效果。但硅胶IOL的前房纤维素样渗出物及IOL表面沉积物发生率高于PMMA和丙烯酸酯IOL。丙烯酸酯和硅胶IOL的后发障发生率低于PMMA IOL。     

ZCB00非球面人工晶状体眼内稳定性及视觉质量观察

目的 对新型Tecnis ZCB00一片式非球面人工晶状体(intraocular lens,IOL)和其他两种一片式非球面IOL在植入术后的眼内稳定性和全眼高阶像差(high order aberration,HOA)各成分及调制传递函数(modulation transfer function,MTF)值等情况作一比较,以了解这种新型非球面IOL设计特性对视觉质量的影响.方法 对单纯性白内障患者116只眼进行术后3个月的随访.这些患者分别植入Tecnis IOL(ZBC00)28只眼、Akreos IOL(AO)28只眼、Acysof SN60WF IOL(IQ)30只眼,以及AR40e IOL 30只眼进行iTrace和Pentacam检查.记录5 mm瞳孔直径下的HOA各成分及MTF值,连同球面IOL组进行比较.使用Pentacam三维眼前房测量系统采集各眼Scheimpflug图像,用Image-pro plus 6.0图像分析得出IOL的倾斜度和偏心量并进行比较.结果 在水平和垂直方向上,各组患者IOL偏心值组间差异有统计学意义;在IOL倾斜度上,ZCB00组低于另两组但各组间差异无统计学意义.三种非球面IOL的高阶像差各成分比较,全眼及眼内高阶像差中只有球差差异均有统计学意义.除30 c/d空间频率外,其他空间频率下不同非球面及球面IOL的MTF值差异均有统计学意义(P＜0.05).三种非球面IOL不同空间频率下各组MTF值差异无统计学意义.结论 新型Tecnis ZCB00一片式非球面人工晶状体植入术后功能性视力明显提高,以襻部补偿设计为特征的3点固定可以增加囊袋内的稳定性,减少眼内IOL偏心倾斜的发生.     

应用PENTACAM三维眼前段分析仪对人工晶状体在眼内稳定性的研究

目的:采用PENTACAM三维眼前段分析仪研究3种类型人工晶状体在眼内的倾斜度数、偏心值以及前房深度的变化情况,评价其在眼内的稳定性。方法:采用临床随机前瞻性研究,对109例(117只眼)老年性白内障患者行超声乳化白内障吸除术,随机植入一片式AcrysofSA60AT、三片式TecnisZ9001或SensarAR40e人工晶状体,采用PENTACAM三维眼前段分析仪测量三组术后1d、1、3、6及12个月人工晶状体的偏心量、倾斜度及前房深度值。结果:分别比较各组在不同时期的平均偏心量与平均倾斜度,差异均无统计学意义(P>0.05)。在术后1d、1、3、6及12个月,分别比较3组的平均偏心量与平均倾斜度,差异均无统计学意义(P>0.05)。一片式AcrysofSA60AT组在不同时期的前房深度变化不大,差异无统计学意义(P>0.05);而三片式TecnisZ9001及SensarAR40e组术后第1天的前房深度大于术后其它时期,也大于一片式AcrysofSA60AT组术后不同时期的值,差异有统计学意义(P<0.05)。结论:PENTACAM三维眼前段分析仪可动态客观地评价人工晶状体在眼内的稳定性;适当的连续环形撕囊和准确的囊袋内固定能很好地维持折叠式人工晶状体在眼内的稳定性,且AcrysofSA60AT一片式软性襻人工晶状体的囊袋稳定性略优于三片式硬性襻人工晶状体。     

不同设计人工晶状体植入术后3年后囊膜混浊的研究

目的研究不同材料和不同设计的人工晶状体植入术后3年的后囊膜混浊(posterior capsular opacification,PCO)发生率及PCO形态。方法回顾性研究132眼老年性白内障患者,由同一医生进行超声乳化联合人工晶状体(in-traocular lens,IOL)植入术,根据IOL的不同分为4组:Storz Hydroview H60M组(33眼),Silicone折叠式硅胶IOL组(29眼),AcrySof三片式IOL组(36眼)和聚甲基丙稀酸甲酯(poly-methyl methacrylate,PMMA)组(34眼)。术后3年随访患眼的最佳矫正视力(best corrected visual acuity,BCVA),扩瞳后采集PCO数码图像,分析不同IOL组PCO的形态及PCO发生率。结果各种IOL的PCO形态各异,H60M组和AcrySof组分别有10眼和15眼后囊形成皱折,而Silicone和PMMA组为片状混浊。虽然各组BCVA和BCVA下降率差异没有显著性(P>0.05),但PCO发生率差异有非常显著性,分别是AcySof组5.6%,Silicone组30.3%,H60M组31%和PMMA组55.9%。结论AcrySof疏水丙烯酸酯三片式折叠IOL,有直角边缘设计,术后3年能明显降低PCO的发生。     

Phacoemulsification in patients with Fuchs' heterochromic uveitis

PURPOSE: To evaluate the results of phacoemulsification with capsular bag fixation of a poly(methyl methacrylate) (PMMA), acrylic, or silicone intraocular lens (IOL) in patients with complicated cataract resulting from Fuchs' heterochromic uveitis (FHU). SETTING: Department of Ophthalmology, Postgraduate Institute of Medical Education and Research, Chandigarh, India. METHODS: This study evaluated 20 eyes of 19 patients with FHU and cataract who had uneventful phacoemulsification with endocapsular implantation of an IOL and completed a 1-year follow-up. RESULTS: Preoperatively, loss of the iris collarette and fine keratic precipitates were seen in all 20 eyes, iris heterochromia in 16, iris atrophy in 12, and iris nodules in 2. Fourteen eyes had mild or negligible preoperative anterior chamber inflammation. No eye had increased intraocular pressure. An acrylic IOL was implanted in 10 eyes, a silicone IOL in 4, and a PMMA IOL in 6. There were no significant differences in outcomes among the 3 IOL groups. Three patients had intraoperative hyphema that resolved spontaneously. Postoperatively, 16 eyes had mild anterior chamber reaction. Four patients had significant anterior chamber inflammation necessitating the use of frequent topical steroids. No case had secondary glaucoma or posterior synechias. The best corrected visual acuity was 6/5 in 6 eyes, 6/6 in 11, and 6/9 in 3. CONCLUSIONS: Uneventful phacoemulsification with endocapsular IOL implantation visually rehabilitated patients with FHU. All 3 IOLs yielded similar results except for increased early postoperative inflammation and late dense anterior capsule opacification in the silicone group. Further studies comparing the outcome of different IOL materials are required to determine their effectiveness in patients with FHU.     

Scheimpflug measurement of intraocular lens position after piggyback implantation of foldable intraocular lenses in eyes with high hyperopia

PURPOSE: To investigate the position of 3-piece foldable intraocular lenses (IOLs) after piggyback implantation for high hyperopia. SETTING: University Eye Hospital, Johann Wolfgang Goethe University, Frankfurt am Main, Germany. METHODS: Eight eyes of 5 highly hyperopic patients had phacoemulsification and implantation of 2 foldable IOLs. In 3 eyes, both IOLs were implanted in the capsular bag. In 5 eyes, 1 IOL was placed in the capsular bag and the second IOL in the ciliary sulcus. Intraocular lens optic tilt and decentration, combined thickness of both IOLs, and anterior chamber depth (ACD) were measured postoperatively over a period of 18 months using Scheimpflug photography. RESULTS: All eyes with both IOLs in the capsular bag showed interpseudophakic opacification, with a mean increase in combined IOL thickness of 0.4 mm, a decrease in ACD of 0.3 mm, and a corresponding hyperopic shift of 4.00 diopters. Eyes in which the anterior IOL was placed in the ciliary sulcus showed no changes in refraction or combined IOL thickness. In these eyes, the anterior IOL had a higher mean decentration (0.49 mm +/- 0.20 [SD] after 12 months) than the posterior IOL (0.21 +/- 0.13 mm after 12 months). CONCLUSIONS: Piggyback IOL implantation with placement of 2 foldable IOLs in the capsular bag can be followed by a hyperopic shift that may be caused in part by displacement of the IOLs. Placement of the anterior IOL in the ciliary sulcus can lead to higher decentration of this IOL.     

A prospective, randomised comparison of single and three piece acrylic foldable intraocular lenses

AIMS: To compare the postoperative performance of single and three piece acrylic foldable intraocular lenses (IOLs). METHODS: 20 patients underwent bilateral cataract surgery with a single piece SA30AL IOL in one eye and a three piece MA30BA IOL in the other eye. The eyes were randomly assigned to either a single or three piece lens. The amount of IOL decentration and tilt, area of anterior capsule opening, and degree of posterior capsule opacification were measured using the Scheimpflug anterior segment analysis system (Nidek EAS-1000). Visual acuity and contrast sensitivity were examined. Measurements were performed by masked examiners before and 1 day, 1 week, 1, 3, 6, and 18 months after surgery. RESULTS: There were no significant differences between the two groups (p>0.05, paired t test) in the amount of IOL decentration, IOL tilt, area of anterior capsule opening, degree of posterior capsule opacification, best corrected visual acuity, and contrast sensitivity throughout the 18 month follow up period. CONCLUSION: The single and three piece acrylic foldable IOLs are equally stable in the eye after surgery.     

折叠式人工晶状体囊袋内植入后偏心与倾斜的临床研究

目的 比较目前临床上常用的四种折叠式人工晶状体（intraocular lens,IOL）在囊袋内植入后偏心与倾斜的差异。方法对65例／眼单纯性白内障患者进行术后3个月的随访。这些患者分别植入了一体式疏水丙烯酸酯IOL（SA60AT,Alcon）、三体式疏水丙烯酸酯IOL（AR40e，AMO）、三点固定式亲水丙烯酸酯IOL（XISTABI，IOLTECH）及四点固定式亲水丙烯酸酯IOL（QUATTRO SE，Comeal）。用眼前节成像系统Pentacam（Oculus）采集各眼的Scheimpflug图像，用图像分析的方法得出IOL的偏心值与倾斜度。结果SA60AT、AR40e、XLSTABI、QUATTRO SE四组患者IOL的平均偏心值分别为（281．49±169．58）μm、（346．35±177．08）μm、（531．33±254．70）μm、（360．59±185．91）μm，其差异有显著统计学意义（P=0.0100）。四组患者IOL的倾斜度的中位数分别为0．98°（0．70°～1．73°）、1．33°（0．86°-1.83°）、1．50°（0．80°-2．68°）、1.38°（0.94°～2.37°），其差异无统计学意义（P=0．3885）。四组患者的最佳矫正视力和对比敏感度差异无统计学意义（P〉0．05）。结论四种IOL囊袋内植入后在倾斜度方面无差异，而在居中性方面，SA60AT优于XLSTABI，其他各种IOL间两两比较均无明显差异。     

Refraktion, Vorderkammertiefe, Dezentrierung und Tilt nach Implantation monofokaler und multifokaler Silikonlinsen

BACKGROUND: We prospectively investigated changes in refraction, anterior chamber depth, decentration and tilt after implantation of multifocal (MIOL) and monofocal (MONO) intraocular lenses (IOL). PATIENTS AND METHODS: We examined 103 cataractous eyes from 103 patients receiving either a three-piece monofocal or multifocal silicone IOL. Anterior chamber depth (ACD), amount of IOL decentration, and degree of IOL tilt were quantified using retroillumination and Scheimpflug photographs. Examinations, including subjective refraction, were performed preoperatively, one week and 6 months postoperatively. RESULTS: All eyes were within 2 dpt (spherical equivalent) from the target refraction, and 93% of eyes with a MIOL were within 1 dpt. No significant refractive shift or ACD change occurred during the postoperative course. Median tilt in the MIOL group at 6 months was 1.1 degrees (0-2.6) and that in the MONO group 1.0 degree (0-2.5). There was no statistically significant change in intraindividual IOL decentration or tilt. CONCLUSION: Three-piece silicone MIOLs and MONOs with polymethylmethacrylate haptics implanted in the capsular bag after circular capsulorhexis provide good centration and very little tilt without statistically significant change up to 6 months after surgery. Postoperative refractive shift is of minor concern for 6 months after surgery.     

Transscleral fixation of a single-piece hydrophilic foldable acrylic intraocular lens

BACKGROUND: To evaluate the results of transscleral fixation of foldable hydrophilic acrylic intraocular lenses (IOLs). METHODS: Twenty eyes of 16 patients, aphakic after phacoemulsification (PE) surgery and with at least 6 months follow-up, were included in the study. All eyes were implanted with single-piece hydrophilic foldable acrylic lenses by transscleral fixation, either with PE surgery (2 eyes) or secondarily. RESULTS: Follow-up was 11.6 months (SD 4.85, range 6-20 mo). Age was 62.3 years (SD 12.95, range 18-78 y); 10 patients were women. Preoperative best corrected visual acuity (BCVA) was 0.20 (SD 0.14, range 0.1-0.3) in eyes with primary IOL implantation and 0.53 (SD 0.12, range 0.3-0.7) in secondary implantation. Astigmatism was 1.4 D (SD 1.19, range 0.25 to 5.0 D). Postoperatively, transient corneal edema developed in 6 eyes (30%) and transient IOP elevation in 2 eyes (10%). BCVA was 0.69 (SD 0.15, range 0.4-0.9), astigmatism was 0.84 D (SD 0.80, range 0.25 to 3.0 D), both p < 0.01. Spherical refractive error was -0.38 D (SD 0.47, range +0.75 to -1.25 D). Cystoid macular edema was observed in 2 eyes (10%). No IOL decentration was observed on biomicroscopy in any eye with undilated pupil; IOL decentration with no effect on vision was observed in 3 eyes (15%) after pupil dilation. No IOL tilt, retinal detachment, suture exposure, or endophthalmitis was observed. INTERPRETATION: Scleral fixation of foldable IOLs may be preferred in eyes with insufficient zonular and capsular support. This technique reduces surgery time and complications, and it provides early visual rehabilitation.     

Aqueous flare induced by heparin-surface-modified poly(methyl methacrylate) and acrylic lenses implanted through the same-size incision in patients with diabetes.

PURPOSE: To compare the degree of blood-aqueous barrier (BAB) breakdown in eyes of diabetic patients after phacoemulsification and implantation of heparin-surface-modified poly(methyl methacrylate) (PMMA) or soft hydrophobic acrylic intraocular lenses (IOLs) performed using the same technique with the same incision size to determine the influence of the IOLs on postoperative inflammation independent of other surgical factors. SETTING: Department of Ophthalmology, University of Paris XIII, Bobigny, France. METHODS: In a prospective study, 44 eyes of 31 diabetic patients with or without mild to moderate diabetic retinopathy were randomly assigned to receive an HSM PMMA IOL (22 eyes) or a soft hydrophobic acrylic IOL (22 eyes) after standardized phacoemulsification surgery. Both types of IOLs had a 6.0 mm optic, were inserted unfolded, and were placed in the bag through a calibrated 6.0 mm superior scleral incision. Anterior chamber flare was measured preoperatively and 1, 7, 30, and 240 days postoperatively using the Kowa 500 laser flare meter. RESULTS: The mean flare value was higher on the first postoperative day in both groups. There were no statistically significant between-group differences in flare scores or clinical parameters preoperatively or at any postoperative visit. CONCLUSIONS: No significant difference was observed in inflammation between eyes having HSM PMMA IOL implantation or those having soft hydrophobic acrylic IOL implantation through the same-size incision. This indicates that hydrophobic acrylic and HSM PMMA materials induce the same degree of BAB breakdown after phacoemulsification in eyes of diabetic patients.     

四种非球面人工晶状体植入术后倾斜和偏心的比较

目的 比较目前临床上常用的4种不同非球面人工晶状体(IOL)在囊袋内植入后偏心和倾斜的差异.方法 回顾性系列病例研究.回顾性分析单纯性白内障患者130只眼术行超声乳化白内障吸除联合IOL植入术后3个月的随访资料.患者分别植入一体四襻式亲水丙烯酸酯IOL(Akreos AO,美国Bausch & Lomb公司)、三体c形襻疏水丙烯酸酯IOL(Tecnis9003,美国AMO公司)、一体L形襻疏水丙烯酸酯IOL(SN60WF,Alcon)、一体C形襻亲水丙烯酸酯IOL(920H,Rayner)4种非球面IOL以及三体C形襻疏水丙烯酸酯球面IOL(AR40e,AMO).使用Pentacam三维眼前房测量系统采集各眼Scheimpflug图像,用Image-pro plus 6.0图像分析得出IOL的倾斜度和偏心量,满足正态分布和方差齐性的行单因素方差分析,采用SNK-q检验进行组间两两比较.结果 除AR40e组的IOL倾斜度之外,其余各组患者IOL偏心值和倾斜度在水平和垂直方向上的数值差异均无统计学意义,取倾斜或偏心的最大值作为该患者的最终结果.AO、Z9003、IQ、920H、AR40e各组患者IOL的平均倾斜度分别为2.08°、2.58°、1.72°、1.81°、3.22°,其差异有统计学意义(F=4.511,P=0.003);各组患者IOL的偏心量分别为0.04 mm、0.24 mm、0.25 mm、0.19 mm、0.18 mm,在垂直方向上其差异有统计学意义(F=4.162,P=0.047),而在水平方向上各组患者IOL偏心值差异则无统计学意义(F=3.921,P=0.056).Z9003组IOL的偏心量和倾斜度线性相关(r=-0.517,P=0.034).结论 不同非球面IOL囊袋内植入后无论倾斜和偏心,结果推断可能一体优于三体IOL,多襻支撑优于双襻支撑IOL,但仍需结合临床专业知识判断.     

Comparison of glistenings in intraocular lenses with three different materials: 12‐year follow‐up

Purpose: To compare the degree of lens glistenings associated with three intraocular lenses (IOLs) of different materials and examine the relationship between the dioptric power of the optics and lens glistenings in a long‐term study. Setting: St. Erik Eye Hospital, Stockholm, Sweden. Methods: Forty‐six eyes of 46 patients underwent standard phacoemulsification and implantation with a heparin‐surface‐modified (HSM) polymethylmethacrylate (PMMA) IOL, a silicone IOL or a hydrophobic acrylic IOL. Evaluations of the patients and the glistenings were conducted 11.3–13.4 years postoperatively. The glistenings were examined using Scheimpflug imaging and subsequently analysed using an image analysis program. Results: The median follow‐up time was 12.2 years (range, 11.3–13.4). The hydrophobic acrylic IOL had significantly more lens glistenings than the silicone (p = 0.003) and the PMMA (p = 0.000) IOLs. The silicone IOL had significantly more lens glistenings than the PMMA lens (p = 0.048). The IOL power did not affect the degree of lens glistenings in the hydrophobic acrylic IOL group (p = 0.64). The other groups had too little lens glistenings to evaluate the relationship. Conclusion: In this long‐term follow‐up study, the hydrophobic acrylic IOL had a significantly higher degree of lens glistenings compared to the silicone and PMMA IOLs. The PMMA IOL had almost no lens glistenings. The IOL dioptric power was not significantly correlated with the degree of lens glistenings associated with the hydrophobic acrylic IOL.     

Fourier analysis of irregular astigmatism after implantation of 3 types of intraocular lenses

PURPOSE: To evaluate irregular astigmatism after silicone, acrylic, and poly(methyl methacrylate) (PMMA) intraocular lens (IOL) implantation using Fourier analysis of videokeratography data. METHODS: Two hundred forty eyes having phacoemulsification and IOL implantation were randomly assigned to 1 of 3 groups: 3.5 mm incision and silicone IOL, 4.1 mm incision and acrylic IOL, or 6.5 mm incision and PMMA IOL. All eyes had videokeratographic examinations preoperatively and 2, 4, and 10 days and 1 and 3 months postoperatively. The dioptric data of the central cornea were decomposed into spherical equivalent, regular astigmatism, and irregular astigmatism (decentration and higher-order irregularity) components using Fourier analysis. RESULTS: Regular astigmatism in the PMMA group was greater than in the silicone and acrylic groups. Decentration in all 3 groups increased significantly postoperatively but virtually returned to preoperative levels by 10 days. No significant difference was observed among the 3 groups. Higher-order irregularity significantly increased after surgery in all 3 groups. The higher-order irregularity in the PMMA group persisted for up to 1 month, while that in the silicone and acrylic groups returned to preoperative levels by 4 days, resulting in significant differences between these groups 10 days and 1 month after IOL implantation. CONCLUSION: Irregular astigmatism, both the decentration and higher-order irregularity components, increased significantly after 3 types of scleral tunnel incisions for silicone, acrylic, or PMMA IOL implantation but returned to preoperative levels soon after surgery except for the higher order irregularity after PMMA IOL implantation.     

Changes in posterior capsule opacification after poly(methyl methacrylate), silicone, and acrylic intraocular lens implantation.

PURPOSE: To prospectively evaluate the progression of posterior capsule opacification (PCO) after poly(methyl methacrylate) (PMMA), silicone, and acrylic intraocular lens (IOL) implantation. SETTING: Hayashi Eye Hospital, Fukuoka, Japan. METHODS: Three hundred eyes of 300 patients scheduled to have IOL implantation were initially randomized into 3 groups based on IOL type: PMMA, silicone, or acrylic. Of the 300 eyes, 269 completed the follow-up. The PCO density in these eyes was measured 1 week and 3, 6, 12, 18, and 24 months postoperatively using special computer software developed for the Scheimpflug videophotography system. Visual acuity and the incidence of neodymium:YAG (Nd:YAG) laser capsulotomy were also examined. RESULTS: Three months postoperatively and later, the mean PCO value in the PMMA group increased significantly (P <.0001); the increase in the silicone and acrylic groups was not significant. The PCO value in the PMMA group was significantly greater than in the silicone or acrylic group (P <.0001). The PCO value in the acrylic group was slightly less than in the silicone group at 18 and 24 months, but the difference was marginal. The survival rate not requiring Nd:YAG capsulotomy was least in the PMMA group, followed by the silicone and acrylic groups in that order (P <.0001). The mean logMAR visual acuity in the PMMA group increased postoperatively and was worse than in the silicone or acrylic group. CONCLUSIONS: The degree of PCO after PMMA IOL implantation progressed significantly with time, while the progression after silicone and acrylic IOL implantation was slight. Therefore, PCO in eyes with a PMMA IOL was significantly more extensive than in those with a silicone or acrylic IOL and resulted in marked impairment of visual acuity.     

Comparison of the stability of 1-piece and 3-piece acrylic intraocular lenses in the lens capsule

PURPOSE: To compare the degrees of intraocular lens (IOL) decentration, tilt, and longitudinal movement; the refractive change; and anterior capsule contraction after cataract surgery between eyes with a 1-piece acrylic IOL with soft acrylic loops and eyes with a 3-piece acrylic IOL with rigid poly(methyl methacrylate) loops. SETTING: Hayashi Eye Hospital, Fukuoka, Japan. METHODS: Fifty-six patients had implantation of a 1-piece acrylic IOL in 1 eye and a 3-piece acrylic IOL in the fellow eye. The degree of IOL decentration and tilt, the anterior chamber depth (ACD), and the area of anterior capsule opening were measured using Scheimpflug videophotography 3 days and 1, 3, and 6 months postoperatively. The postoperative refractive status was also examined. RESULTS: The mean degrees of decentration and tilt in the 1-piece IOL group were similar to those in the 3-piece IOL group throughout the follow-up. The ACD did not change after surgery in the 1-piece group but showed significant shallowing in the 3-piece group (P < .0001). The spherical equivalent (SE) did not change in the 1-piece group, while the SE had a significant myopic shift of approximately 0.4 diopter in the 3-piece group. The percentage of anterior capsule contraction was similar between the groups. CONCLUSIONS: The degree of IOL decentration and tilt and percentage of anterior capsule contraction in eyes with a 1-piece acrylic IOL with soft acrylic loops were similar to those in eyes with a 3-piece acrylic IOL. The longitudinal movement of the 1-piece IOL was less than the movement of the 3-piece IOL, resulting in less postoperative myopic shift.     

Elapsed time for capsular apposition to intraocular lens after cataract surgery

OBJECTIVE: To examine when the anterior and posterior lens capsule completely become apposed to optics of silicone and acrylic intraocular lenses (IOLs) implanted after cataract surgery and to determine whether the different IOL materials influence the timing of completion of capsular contact. DESIGN: Randomized controlled clinical trial. PARTICIPANTS: Seventy eyes of 70 patients who were scheduled to undergo cataract surgery were randomly assigned to two groups using random number tables based on the type of IOL implanted: silicone or acrylic. Thirty-two patients in each group completed the follow-up. INTERVENTION: All eyes underwent phacoemulsification surgery with implantation of either a silicone or acrylic IOL. All IOLs were accurately placed into the capsular bag. MAIN OUTCOME MEASURES: Contact of the anterior and posterior lens capsule with the IOL optic surface was evaluated using the Scheimpflug videophotography system at 3, 5, 7, 9, 11, 14, 21, and 28 days after surgery. The postoperative day at which each capsule was completely apposed to the IOL optic was determined. In addition, anterior chamber depth was also measured. RESULTS: The anterior capsule was in contact with the IOL optic on the same day or earlier than the posterior capsule in all patients. Complete apposition of the IOL was observed significantly earlier with silicone IOLs than with acrylic IOLs with both the anterior capsule (6.2 versus 3.6 postoperative days; P < 0.0001) and the posterior capsule (11.1 versus 7.4 postoperative days; P = 0.0339). No significant change in mean anterior chamber depth was observed with the silicone IOL, whereas there was significant anterior shift after implantation of the acrylic IOL. CONCLUSIONS: Capsular contact with the IOL optic is completed within approximately 8 days after cataract surgery with silicone IOLs and 11 days with acrylic IOLs. Complete apposition to both the anterior and posterior capsule was significantly earlier with silicone IOLs than with acrylic IOLs.     

应用Pentacam三维眼前节分析仪评价玻璃体切割联合白内障超声乳化术后人工晶状体在眼内的稳定性

目的采用Pentacam三维眼前节分析仪研究玻璃体切割联合白内障超声乳化术后前房深度（ACD）、人工晶状体（IOL）倾斜度及偏心度的变化情况,及不同玻璃体腔填充物对IOL在眼内稳定性的影响。方法采用临床前瞻性研究,对玻璃体视网膜疾病合并白内障患者42例46眼行1期玻璃体切割联合白内障超声乳化IOL（AcrySofSA60）植入术,根据眼底情况选择灌注液、惰性气体及硅油填充,采用Pentacam三维眼前节分析仪测量术后1周、1个月、3个月IOL的位置。结果手术前后不同时间点间ACD值的差异有统计学意义（F=64.239,P=0.000）,术后各时间点ACD值均较术前增加（P〈0.05）,但术后3个月达到稳定。术后不同时间点间IOL偏心度差异有统计学意义（F=26.459,P=0.000）,术后3个月硅油填充组与术后1周、1个月相比IOL偏心量均明显增加（P〈0.05）;不同玻璃体填充物组IOL偏心量的差异无统计学意义（F=2.282,P=0.114）。在术后各个随访时间点,IOL倾斜度的差异无统计学意义（F=0.977,P=0.401）,不同玻璃体填充物组的IOL倾斜度差异无统计学意义（F=1.413,P=0.254）。结论 Pentacam三维眼前节分析仪可动态观察并评价IOL在眼内的稳定性;惰性气体填充对眼内IOL的影响较灌注液填充和硅油填充明显,但总体而言各种玻璃体腔填充眼术后IOL在眼内的位置基本稳定。