Contrast sensitivity function in eyes with diffractive bifocal intraocular lenses

PURPOSE: To evaluate the image quality of asymmetric Acri.Twin bifocal intraocular lenses (IOLs) (Acri.Tec) by comparing distance and near black-white contrast sensitivity function with that of the Pharmacia 811E IOL. SETTING: Department of Ophthalmology, Medical University of Vienna, Vienna, Austria. METHODS: Thirty-two eyes of 16 patients were examined after contralateral implantation of 1 Acri.Twin near-weighted 733D IOL and 1 Acri.Twin distance-weighted 737D IOL. Twenty eyes in 10 patients were examined after binocular Pharmacia 811E IOL implantation. Best corrected distance and near visual acuities were determined. Individual reading distance was recorded and corrected to 40 cm for the near contrast test (Holladay Contrast Acuity Test). Distance contrast sensitivity function was evaluated using the Acuity Max (Science 2020) computer program. RESULTS: Best corrected distance visual acuity was significantly better in patients with the 737D IOL than in those with the 733D or 811E IOLs. For distance reading with best distance correction, the 733D IOL performed better than the 737D and the 811E. Individual reading distance with the Acri.Twin IOL and 811E IOL was 33.6 cm and 34.0 cm, respectively. Best distance-corrected near contrast sensitivity function was better in eyes with the near-weighted 733D IOL. Binocular testing showed a significant difference between the 2 groups only at low-contrast values. At distance, contrast sensitivity function was better with the 737D IOL, whereas no difference was found between the 733D and the 811E IOLs. Binocular contrast sensitivity function at distance revealed statistically significantly better results in the Acri.Twin group. CONCLUSION: An asymmetric diffractive bifocal lens system was advantageous in terms of vision quality when implanted binocularly and superior to monocular stronger weighted focus compared with conventional bifocal IOLs.     

Evaluation of a toric intraocular lens with a Z-haptic

PURPOSE: To evaluate the efficacy and rotational stability of the MicroSil 6116TU foldable 3-piece silicone toric intraocular lens (IOL) (HumanOptics). SETTING: Department of Ophthalmology, Hillingdon Hospital, Uxbridge, Middlesex, United Kingdom. METHODS: This prospective observational study included 21 eyes of 14 consecutive patients with more than 1.50 diopters (D) of preexisting corneal astigmatism having cataract surgery. Phacoemulsification was performed, and a MicroSil 6116TU toric IOL was inserted through a 3.4 mm temporal corneal incision. LogMAR uncorrected visual acuity (UCVA), best corrected visual acuity, refraction, keratometry, and cylinder axis of the toric IOL were measured. RESULTS: The mean preoperative refractive and keratometric astigmatism was 3.52 D +/- 1.11 (SD) and 3.08 +/- 0.76 D, respectively. Six months postoperatively, the logMAR UCVA in eyes without ocular comorbidity (n = 14) was 0.20 +/- 0.15 (Snellen 20/32). Seventy-nine percent (11 eyes) had a visual acuity of 0.24 (Snellen 20/35) or better. The mean refractive astigmatism at 6 months was 1.23 +/- 0.90 D. Vector analysis using the Holladay-Cravy-Koch method showed a mean reduction in refractive astigmatism of 2.16 +/- 2.33 D. The mean difference between intended and achieved cylinder axis at 6 months was 5.2 degrees (range 0 to 15 degrees). No IOL rotated more than 5 degrees during the follow-up period. CONCLUSIONS: The MicroSil 6116TU toric IOL reduced visually significant keratometric astigmatism and increased spectacle independence. The IOL was stable in the capsular bag, showing no significant rotation up to 6 months postoperatively.     

双焦点及散光双焦点人工晶状体混搭植入术后双眼视觉质量的研究

目的：研究散光矫正型双焦点人工晶状体与双焦点人工晶状体混搭植入术后的双眼视觉质量。

方法：横断面研究。纳入2020-01/2021-01收治的年龄相关性白内障患者54例108眼,按植入人工晶状体及术前角膜散光不同分为3组,A组21例42眼术前角膜散光均<1.0D,双眼植入双焦点人工晶状体; B组15例30眼术前角膜散光均≥1.0D,双眼植入散光双焦点人工晶状体; C组18例36眼,一眼术前角膜散光<1.0D,另一眼术前角膜散光≥1.0D,前者植入双焦点人工晶状体,后者植入散光双焦点人工晶状体。比较三组患者术前单眼视力,术后双眼视力、残余散光、双眼离焦曲线、对比敏感度(CS),三组患者术后进行问卷调查评估视觉质量。

结果：三组患者术前视力、术前眼压均无差异(P>0.05)。A组术后残余散光显著高于另两组(P=0.012,<0.05)。B组和C组双眼远视力优于A组(均P<0.05); B组和C组双眼近视力优于A组(均P<0.01); A组双眼中视力优于B组和C组(均P<0.01)。明视眩光6、12c/d,暗视6、12、18c/d,以及暗视眩光1.5、3、6、12、18c/d的空间频率下A组CS较B组和C组显著降低(均P<0.05)。术后视功能调查表三组间无差异(P>0.05)。

结论：散光双焦人工晶状体与双焦人工晶状体混搭植入可改善患者术后视觉质量。矫正散光有助于提高术后患者的视觉CS,但是散光全矫后,可能会导致患者术后中视力的下降。     

Symmetric bilateral implantation of a distance-dominant diffractive bifocal intraocular lens

PURPOSE: To assess visual results after symmetrical bilateral implantation of a distance-dominant bifocal diffractive intraocular lens (IOL). SETTING: Fernández-Vega Ophthalmological Institute, Oviedo, Spain. METHODS: Fifty patients had bilateral implantation of a distance-dominant diffractive bifocal 447D IOL (Acri.Tec GmbH) in a prospective study. Monocular and binocular best corrected distance visual acuities and best distance-corrected near visual acuity, binocular best distance-corrected intermediate visual acuity, and distance contrast sensitivity under photopic (85 cd/m(2)) and mesopic (5 cd/m(2)) conditions were determined. RESULTS: At the 6-month postoperative visit, the mean binocular best corrected distance acuity and best corrected distance near acuity were 0.02 +/- 0.04 logMAR and 0.04 +/- 0.03 logMAR, respectively. Binocular best corrected distance intermediate visual acuity worsened significantly as a function of the distance of the test: from 0.04 +/- 0.03 logMAR at 33 cm to 0.21 +/- 0.08 logMAR at 70 cm (P<.01). Contrast sensitivity was within normal limits under photopic and mesopic conditions. Binocular contrast sensitivity was statistically significantly better than monocular contrast sensitivity at all spatial frequencies under both illumination levels (P<.01). CONCLUSION: Bilateral implantation of the distance-dominant bifocal 447D IOL provided good simultaneous distance, near, and intermediate vision with improved contrast sensitivity under photopic and mesopic conditions.     

Reading performance with a refractive multifocal and a diffractive bifocal intraocular lens

PURPOSE: To evaluate the reading performance of a diffractive bifocal (811E, Pharmacia) and a refractive multifocal (SA40N, Allergan) intraocular lens (IOL) and compare it with that of a monofocal IOL (811C, Pharmacia) with respect to reading acuity, reading speed based on print size, maximum reading speed, reading distance, and critical print size. SETTING: Department of Ophthalmology, University of Vienna, Vienna, Austria. METHODS: This study comprised 120 pseudophakic eyes of 70 patients; each IOL group had 40 eyes. The patients' age, sex, and best corrected logMAR visual acuity were recorded. Reading acuity and speed were tested monocularly. Reading acuity was determined in logRAD (ie, the reading equivalent of logMAR). Patients with bifocal and multifocal IOLs read with best distance correction and patients with a monofocal IOL, with an addition of +3.0 diopters. RESULTS: The age, mean spherical equivalent, cylinder, and best corrected distance visual acuity were comparable among the 3 groups. The mean logRAD reading acuity was 0.17 +/- 0.18 (SD) in the 811E group (94.0% of logMAR), 0.31 +/- 0.13 in the SA40N group (73.2% of logMAR), and 0.24 +/- 0.22 in the 811C group (94.1% of logMAR). The reading acuity in the SA40N group was statistically significantly lower than in the 811E and 811C groups. The best reading distance was 30 cm in the 811E group and 40 cm in the SA40N group. The mean maximum reading speeds in words per minute were comparable: 187.5 +/- 26.1 (811E), 171.0 +/- 21.1 (SA40N), and 179.4 +/- 21.6 (811C). The reading speed, which ranged from logRAD 0.7 to 0.3, and the critical print size in the SA40N group were significantly worse than in the 811E and 811C groups. The mean critical print size in the 811E group was significantly worse than in the 811C group. CONCLUSIONS: Reading performance was acceptable in the bifocal and multifocal IOL patients, with the diffractive bifocal IOL performing best in a standardized reading test setting.     

Astigmatism correction with a foldable toric intraocular lens in cataract patients

PURPOSE: To determine the efficacy and rotational stability of a toric posterior chamber silicone intraocular lens (IOL) to correct preoperative astigmatism in cataract patients. SETTING: Department of Ophthalmology, University Hospital of Vienna, Vienna Austria. METHODS: Between 1993 and 1998, foldable toric single-piece plate-haptic silicone IOLs were implanted in 37 eyes (30 patients). The cylindrical IOL power was 2.00 diopters (D) (n = 29), 3.50 D (n = 7), or 4.00 D (n = 1). Phacoemulsification was performed through a scleral or a corneal sutureless self-sealing incision. Outcomes of Snellen visual acuity (without, with spherical, and with best correction), refractive and keratometric astigmatism, and IOL rotation after early postoperative (mean 15.9 days +/- 10.1 [SD]) and long-term (mean 20.3 +/- 16.6 months) follow-ups were evaluated. RESULTS: At last follow-up, 31 eyes (83.8%) had a spherically corrected and 34 (91.9%) a best corrected visual acuity of 0.5 (20/40) or better. Mean preoperative refractive and keratometric astigmatism was 2.68 and 2.70 D, respectively. At the last postoperative follow-up, mean refractive astigmatism was reduced to 0.84 D; keratometric astigmatism was 2.30 D. In 7 eyes (18.9%), the IOL axis was rotated a maximum of 25 degrees. In all 37 eyes, the axis of the toric IOL remained within 30 degrees of rotation. CONCLUSIONS: Early postoperative and long-term follow-ups showed effective and stable correction of astigmatism after implantation of a foldable toric posterior chamber silicone IOL.     

双焦点Toric人工晶状体植入矫正白内障合并角膜散光的疗效观察

目的:评价白内障超声乳化吸除联合双焦点Toric人工晶状体(IOL)植入术的散光矫正临床效果。方法:回顾性分析。纳入2020-08/2021-09间我院白内障超声乳化吸除联合双焦点Toric IOL治疗白内障合并角膜规则散光患者46例46眼的临床资料。术后随访3mo,评价术前及术后1、3mo裸眼远视力(UDVA)、裸眼近视力(UNVA)、矫正远视力(BCDVA)、矫正近视力(BCNVA)及散光的变化。测量并计算IOL轴位旋转度,行问卷调查在不同距离使用眼镜的必要性以及总体满意度。结果:术后1、3mo UDVA、BCDVA、UNVA、BCNVA与术前比较均有差异(均P<0.001),而术后1mo UDVA、BCDVA、UNVA、BCNVA与术后3mo比较均无差异(均P>0.0167)。术后3mo UDVA达到0.20(LogMAR)者46眼(100%),UNVA达到0.20(LogMAR)者40眼(87%)。散光矢量分析显示,术前角膜散光均值为1.88±0.70D,质心值为0.61D@177°±1.93D,术后3mo残余散光均值为0.33±0.30D,质心值为0.03D@34...     

Patient satisfaction after implantation of diffractive designed multifocal intraocular lenses in dependence on objective parameters

BACKGROUND: For optimal patient satisfaction and greatest independence from spectacles after implantation of a diffractive designed multifocal intraocular lens (IOL), emmetropia with a low postoperative astigmatism must be achieved. The aim of this study was to prospectively determine patient satisfaction after implantation of diffractive designed multifocal IOLs in relation to objective parameters. PATIENTS AND METHODS: A total of 69 eyes of 50 patients without additional ocular pathology (mean age 64.8 years) received a diffractive designed multifocal IOL and were examined 12 months postoperatively. Overall patient satisfaction, visual phenomena (halos, glare), and frequency of use of reading spectacles and distance correction were assessed as subjective parameters. As objective parameters, uncorrected and best-corrected distance visual acuity (UCVA, BCVA, respectively), uncorrected, distance corrected and best-corrected near visual acuity, contrast sensitivity (Pelli-Robson charts), pre- and postoperative astigmatism, postoperative spherical equivalent and depth of focus (defocusing curve from +5.0 to -5.0 D) were measured. RESULTS: The mean overall satisfaction on a scale from 5 (excellent) to 1 (poor) was 4.49. Mean postoperative UCVA was 0.85 and BCVA was 1.03. Mean uncorrected near visual acuity was J1.04, distance corrected near visual acuity J1.0 and best corrected near visual acuity J1.0. Postoperative mean spherical equivalent was -0.17 +/- 0.43 D and absolute mean astigmatism was 0.64 D. The use of spectacles was highly correlated with postoperative spherical equivalent and absolute postoperative astigmatism. On a subjective scale from 0 (none) to 4 (very disturbing), a mean halo score of 0.45 and a mean glare score of 0.44 was recorded. Overall satisfaction was significantly correlated with UCVA, age, use of spectacles for distance purposes, contrast sensitivity, postoperative astigmatism, and postoperative spherical equivalent (P<0.05). Linear stepwise regression analysis identified UCVA as the most influential factor for overall patient satisfaction. CONCLUSIONS: For diffractive designed multifocal IOLs, emmetropia and a low astigmatism postoperatively are the most important factors for high patient satisfaction.     

Implantation of a toric phakic intraocular lens to correct high corneal astigmatism in a patient with bilateral marginal corneal degeneration

We present a patient with marginal corneal degeneration and corneal astigmatism of more than 10.0 diopters (D). A toric phakic intraocular lens (IOL) of 7.0 D cylindrical power was implanted in both eyes to correct the high astigmatism. An uncorrected visual acuity of 20/40 was achieved in both eyes, and the best corrected visual acuity improved by 4 Snellen lines to 20/20 in both eyes. Refraction and visual acuity remained stable at 1.5 years postoperatively. Implantation of a toric phakic IOL can be an option to correct high corneal astigmatism even when the full corneal astigmatism cannot be treated.     

散光多焦点IOL植入术后视觉质量及患者满意度研究

目的：观察白内障超声乳化术后植入AT LISA Toric 909MP(909M)散光矫正型多焦点IOL和AT TORBI 709M(709M)散光矫正型单焦点IOL术后视觉质量及患者满意度。

方法：选取2017-12/2018-12在本院行超声乳化IOL植入术合并散光大于1.0D的白内障患者40例56眼,根据患者自愿植入单焦点散光或多焦点散光IOL分为2组,909M组23例35眼,709M组17例21眼,术后随访3mo,观察术后两组视力恢复情况、离焦曲线、残余散光度数、晶状体旋转度、术后视觉质量分析及患者满意度。

结果：治疗后两组的裸眼远视力及最佳矫正远视力较术前明显改善(P<0.05)。离焦曲线显示909M组在0D和-2.5D时有两个视力峰值,在-1D有一个低的峰值。709M组仅在0D有视力峰值。909M组脱镜率为91%(21/23),709M组的脱镜率仅为18%(3/17)。

结论：多焦点和单焦点IOL对于白内障合并散光有良好的矫正效果,旋转稳定性良好,且多焦点IOL为患者提供了良好的远近视力以及可以接受的中视力,提高了患者的脱镜率和满意度。     

双通道技术评价两种衍射型多焦点人工晶状体视网膜成像质量

目的:研究两种非球面衍射型多焦点人工晶状体(IOL)视网膜成像质量。方法:回顾性队列研究。选取2017-10/2019-10诊断为单纯性白内障,行超声乳化吸除联合IOL植入155例155眼为研究对象,植入非球面衍射双焦点IOL 54例54眼、非球面衍射三焦点IOL 54例54眼、单焦点IOL 47例47眼做对照组。随访术后6mo,双通道视觉质量分析系统测量散射指数(OSI)、调制传递函数截止频率(MTF cut off)、斯特列尔比值(SR)、100%、20%、9%模拟对比度视力(OV);记录术后裸眼远距离(5m)、中距离(80cm)、近距离(40cm)视力及矫正远视力、矫正远视力基础上的中距离视力和近距离视力;利用VF-14量表进行评分。结果:双焦组和三焦组MTF cut off均低于单焦组(P=0.007、0.043),双焦和三焦组无差异(P=0.445)。三组OSI值无差异(F=1.143,P=0.322),三组SR值无差异(F=3.045,P=0.051)。双焦组和三焦组模拟对比度视力无差异(OV 100%:P=0.974;OV 20%:P=0.713;OV 9%:P=0.947),而双焦和三焦组均低于单焦点组(OV 100%:双焦vs单焦P=0.001;三焦vs单焦P=0.012;OV 20%:双焦vs单焦P=0.002;三焦vs单焦P=0.043;OV 9%:双焦vs单焦P=0.011;三焦vs单焦P=0.029)。三组术后裸眼远视力及矫正远视力均无差异(P=0.054、0.180)。双焦组与单焦组裸眼中视力有差异(P=0.010),三焦组与单焦组、双焦组均有差异(P<0.01)。双焦组和三焦组裸眼近视力无差异(P=0.428),双焦组和三焦组与单焦组均有差异(P<0.01)。三组患者远视力矫正基础上中视力有差异(H=67.176,P<0.01),双焦组与单焦组有差异(P<0.01),三焦组与单焦组和双焦组均有差异(P<0.01)。三组远视力矫正基础上近视力均有差异(H=91.292,P<0.01),双焦组和三焦组无差异(P=0.519),双焦组和三焦组与单焦组均有差异(P<0.01)。三组VF-14表评分有差异(H=71.342,P<0.01),双焦组和三焦组评分无差异(P=0.055),双焦组和三焦组与单焦组均有差异(P<0.01)。结论:双通道视觉系统评估三焦点、双焦点衍射型人工晶状体视网膜成像质量无差别;三焦点较双焦点人工晶状体,可提供更佳的中距离视力。     

Prospective study of the Acri.LISA bifocal intraocular lens

PURPOSE: To assess the visual results after bilateral implantation of the bifocal Acri.LISA 366D intraocular lens (IOL) (Acri.Tec AG). SETTING: Fernández-Vega Ophthalmological Institute, Oviedo, Spain. METHODS: Eighty-one patients had bilateral implantation of the distance-dominant bifocal Acri.LISA 366D IOL in a prospective study. Monocular and binocular best corrected distance visual acuity and best distance-corrected near visual acuity, binocular best distance-corrected intermediate visual acuity, and distance contrast sensitivity under photopic (85 cd/m(2)) and mesopic (5 cd/m(2)) conditions were determined. RESULTS: At the 3-month postoperative visit, the mean binocular best corrected distance acuity was 0.048 +/- 0.111 logMAR and the mean binocular best distance-corrected near acuity, 0.012 +/- 0.0084 logMAR (both approximately 20/20). The mean binocular best distance-corrected intermediate acuity changed significantly as a function of the distance of the test, from 0.012 +/- 0.084 logMAR (approximately 20/20) at 33 cm to 0.265 +/- 0.099 logMAR (approximately 20/40) at 70 cm (P<.01). Contrast sensitivity was within normal limits under photopic and mesopic conditions. Binocular contrast sensitivity was statistically significantly better than monocular contrast sensitivity at all spatial frequencies under both illumination levels (P<.01). CONCLUSION: The Acri.LISA 366D IOL provided a satisfactory full range of vision; a high level of uncorrected and corrected distance, intermediate, and near acuity; and improved contrast sensitivity under photopic and mesopic conditions.     

Diffractive multifocal intraocular lenses. A prospective clinical study

Forty-three patients were examined three months after implantation of a multifocal or bifocal intraocular lens following cataract extraction. With far vision correction, simultaneous bifocal function with far acuity better than 0.5 and near acuity better than Nieden 3 was achieved in 95.4% of these cases. Glare sensitivity was tested with the BAT and mesopic visual acuity was examined with the Ocutrast. No statistical differences were found between these patients and a control group with monofocal IOLs.     

Clear lens extraction with intraocular lens followed by photorefractive keratectomy or laser in situ keratomileusis

OBJECTIVE: To study photorefractive keratectomy (PRK) or laser in situ keratomileusis (LASIK) after clear lens extraction (CLE) with intraocular lens (IOL) implantation for hyperopia or astigmatism. DESIGN: Retrospective, noncomparative interventional case series. PARTICIPANTS: Sixty-five eyes (55 subjects) had CLE with posterior chamber IOL implants for hyperopia up to 12.25 diopters (D); 31 eyes were retreated with PRK, and 34 eyes were retreated with LASIK for residual ametropias. INTERVENTION: For PRK and LASIK, the refractive surgery was performed with the slit-scanning excimer laser Nidek EC-5000, Nidek Co., Tokyo, Japan. MAIN OUTCOME MEASURES: Manifest refraction, best-spectacle and uncorrected Snellen visual acuity, haze, and halos were evaluated before surgery and at 1, 3, 6, and 12 months postoperative. RESULTS: Forty-seven eyes were evaluated at the 12-month postoperative examination: 96% of these eyes had spherical equivalents (SE) within +/-2 D of emmetropia, 79% of eyes had SE within +/-1 D of emmetropia and 51% of eyes had SE within +/-0.50 D of emmetropia. Eighty-five percent of the eyes at 12 months postoperative had uncorrected visual acuity of 20/40 or better, and 46% of eyes had uncorrected visual acuity of 20/20 or better. Eighty-seven percent of the eyes at 12 months postoperative had uncorrected visual acuity within 1 Snellen line of their initial best spectacle-corrected visual acuity (BSCVA) before all treatment. No eye lost 2 Snellen lines of BSCVA at 3, 6, or 12 months after PRK or after LASIK. CONCLUSIONS: IOL implantation for CLE, although an invasive technique, resulted in better refractive outcomes without laser-related clinical complications after PRK or LASIK adjustment.     

50例Array多焦点人工晶状体的临床应用分析

目的　探讨 Array多焦点人工晶状体的临床价值。方法　对 5 0例 (5 0只眼 )白内障患者实施超声乳化并植入 Array多焦点人工晶状体 (MIOL ) ,对照组 5 0只眼植入眼力健单焦点人工晶状体 (SIOL ) ,观察术后 1周裸眼远视力、矫正远视力、裸眼近视力、视远矫正度数矫正近视力、中间距离视力、对比敏感度、视觉症状及 MIOL组术前术后散光变化 ;随访 3月 ,观察后发障的发生率。结果　两组裸眼远视力、矫正远视力无明显差异 (P >0 .0 5 ) ;裸眼近视力、视远矫正度数矫正近视力及中间距离视力 ,MIOL组明显优于 SIOL组 (P <0 .0 5、 P <0 .0 1) ;后发障 MIOL组 13只眼 (2 6 % ) ,SIOL组 5只眼 (10 % ) ,二者具有统计学意义 (P <0 .0 5 ) ;MIOL组手术前、后的散光状态无明显变化 (P >0 .0 5 ) ;MIOL组对比敏感度明显下降。结论　 MIOL在保证远视力的同时 ,又获得很好的中、近视力 ,取得近似“天然”的全程视力 ,使白内障术后患者生活质量显著提高。     

连续视程人工晶状体与双焦点、单焦点人工晶状体植入术后患者视力、视觉质量及满意度对比分析

目的 比较连续视程人工晶状体与双焦点、单焦点人工晶状体植入术后患者视力、视觉质量及满意度的差异。方法 选取2020年10月至12月于我院行超声乳化白内障吸除联合人工晶状体植入术的患者61例61眼。依据患者人工晶状体植入情况分为3组,连续视程组16例16眼植入Tecnis Symfony连续视程人工晶状体;双焦点组20例20眼植入Tecnis ZMB00一片式非球面双焦点人工晶状体;单焦点组25例25眼植入Tecnis ZCB00一片式非球面单焦点人工晶状体。术后1个月检测患者裸眼远、近视力,绘制离焦曲线,运用双通道视觉质量分析系统OQASⅡ检测植入不同人工晶状体后,患者单眼客观视觉质量。分析并获得客观散射指数(OSI)、调制传递函数截止频率(MTF_{cut off})、斯特列尔比(SR)、三种对比度(100%、20%、9%)下的模拟对比度视力(OV100%、OV20%、OV9%),通过问卷形式对患者进行满意度调查。结果 术后1个月,三组患者33 cm和40 cm裸眼近视力差异均有统计学意义(均为P<0.01),单焦点组患者33 cm和40 cm裸眼近视力均差于双...     

Visual and refractive status at different focal distances after implantation of the ReSTOR multifocal intraocular lens

PURPOSE: To evaluate the visual acuity and determine the refraction in emmetropic pseudophakic eyes at different focal distances after implantation of the AcrySof SA 60D3 ReSTOR multifocal intraocular lens (IOL) (Alcon Laboratories). SETTING: Private clinical practice. METHODS: Thirty-seven eyes of 20 patients received the ReSTOR IOL. Visual acuity was measured at several distances, and best distance corrected, best intermediate corrected (60 cm), and best near corrected (33 cm) visual acuities were determined 3 months after surgery. Subjective outcomes were assessed by a questionnaire. RESULTS: Postoperatively, 36 of 37 eyes (97.3%) were within +/-1.00 diopter (D) of the manifest refraction spherical equivalent and cylinder. Monocularly, the mean best distance corrected, best distance corrected intermediate, and best distance corrected near visual acuities were 20/20, 20/46, and 20/23, respectively. The best distance corrected acuities at 40, 50, 60, and 70 cm were significantly worse than the best distance corrected and best distance corrected near acuities (P<.05). On the questionnaire, all patients noted intermediate blur, but 75% had little or no difficulty seeing and were bothered by the blur occasionally or never. The mean additional add to best distance correction for best intermediate corrected visual acuity was +1.20 diopters (D) +/- 0.27 D or -1.68 +/- 0.24 D and for best near corrected visual acuity, -0.26 +/- 0.24 D. CONCLUSIONS: Implantation of the ReSTOR IOL offered excellent visual acuity at distance and near distance and functional visual acuity in the intermediate range. For patients who need excellent vision at intermediate range, leaving 1 eye with distance myopia or hyperopia to compensate for intermediate vision may provide consistent good binocular vision over the full range in cases of bilateral implantation.     

Comparison of visual and refractive outcomes of diffractive bifocal toric and trifocal toric intraocular lenses 12 months after implantation in patients with moderate to high myopia

Purpose

To compare the visual and refractive outcomes of bifocal toric and trifocal toric intraocular lenses (IOL) in patients with moderate to high myopia at 12 months after implantation.

Method

This is a prospective and comparative study. In 120 eyes with moderate to high myopia and astigmatism, bifocal toric IOLs (n?=?60 eyes) or trifocal toric IOLs (n?=?60 eyes) were implanted. Eyes with axial lengths from 24.0 to 26.5 mm were included. Postoperative examinations measured near, intermediate, and distance visual acuity (VA), along with refractive measurements, binocular defocus curves, and patient satisfaction with the National Eye Institute Visual Function Questionnaire.

Results

For uncorrected- and corrected distance intermediate VA, the trifocal group showed significantly better VA at 1, 3, 6, and 12 months than the bifocal group. Driving subscale scores from the questionnaire were significantly better in the trifocal than the bifocal group. Concerning the binocular defocus curve, uncorrected distance VA was significantly higher in the trifocal than bifocal group at test distances of -1.5 D.

Conclusions

Both trifocal and bifocal toric IOLs effectively corrected the near, intermediate, and distance vision in patients with moderate to high myopia and astigmatism. However, intermediate vision was significantly better in eyes with trifocal than bifocal toric IOLs.

     

三种人工晶状体植入术后静态视力和动态视力的评估及比较

目的：对三焦点、双焦点及连续视程人工晶状体植入术后的单眼视力和动态视力（DVA）进行评估及比较。方法：前瞻性临床研究。选取2020年1月至2021年1月于重庆医科大学附属第一医院眼科行白内障超声乳化摘除联合人工晶状体植入且资料完整的白内障患者65例（81眼）。根据所选择的IOL 类型分为3组：双焦点组33眼,植入Tecnis ZMB00 IOL;三焦点组20眼,植入AT Lisatri.839MP IOL;EDOF组28眼,植入Tecnis ZXR00 IOL。术后3个月分别检测每眼的裸眼静态视力（SVA）：包括裸眼远视力（UDVA）、裸眼中视力（UIVA）、裸眼近视力（UNVA）（LogMAR视力）。采用运动视标法检测裸眼DVA（检测速度分别为4、8、12、24fps）：包括裸眼动态远视力（UDDVA)、裸眼动态中视力（UIDVA）、裸眼动态近视力（UNVA）（LogMAR视力）,并进行评估比较。通过“手抓尺子试验”检测患者反应速度。数据采用卡方检验、方差分析、Kruskal-WallisH检验进行统计分析。结果：3组的总体UDVA、UNVA差异均无统计学意义;3组的总体UIVA差异有统计学意义（H=23.13,P<0.001）,进一步两两比较发现EDOF组优于双焦点组（P<0.001）;三焦点组优于双焦点组（P=0.016）;EDOF 组与三焦点组差异无统计学意义。3组的总体UDDVA在4、8fps时差异均无统计学意义;而在12、24fps时总体差异均有统计学意义（H=10.96,P=0.004;H=11.52,P=0.003）,进一步比较发现双焦点组优于三焦点组（H=-16.21,P=0.003;H=-17.98,P=0.004）,EDOF组优于三焦点组（H=-12.67,P=0.030;H=-16.48,P=0.009）,双焦点组与EDOF组差异无统计学意义。3组的总体UIDVA在8fps 时差异无统计学意义,而在4、12、24fps时差异均有统计学意义（H=8.17~11.36,P<0.05）：4、12fps 时,EDOF组优于双焦点组（H=14.61,P=0.013;H=14.52,P=0.009）,与三焦点组差异无统计学意义;24fps时,EDOF组优于双焦点组、三焦点组（H=15.31,P=0.008;H=-16.60,P=0.027）。3组的总体UNDVA在4、8、12、24fps时差异均有统计学意义（H=11.25~17.61,P<0.05）,且EDOF组均分别优于双焦点组（H=12.71~17.87,P<0.05）和三焦点组（H=-23.04~-15.87,P<0.05）,双焦点组与三焦点组差异均无统计学意义（均P>0.05）。结论：在SVA方面,三焦点IOL及EDOFIOL均可获得较好的UDVA、UIVA、UNVA,而双焦点IOL的UIVA较弱。在DVA方面,远距离、低速度时,3种IOL结果相当;但是近距离、高速度时,EDOFIOL的DVA较其余二者更佳。     

Synchrony dual-optic accommodating intraocular lens. Part 2: pilot clinical evaluation

PURPOSE: To evaluate the clinical outcomes of an accommodating dual-optic intraocular lens (IOL). SETTING: Private practice and university centers. METHODS: A prospective noncomparative case series with retrospective control comprised 21 patients (26 eyes) scheduled for small-incision extracapsular cataract extraction by phacoemulsification with implantation of the Synchrony dual-optic accommodating IOL (Visiogen) (accommodating IOL group) and 10 patients who had small-incision extracapsular phacoemulsification with implantation of a monofocal, single-optic IOL at least 6 months previously (control group). Patients were examined 1, 3, 6, and 12 months after surgery. Defocus curves in the accommodating IOL group were compared with those in the control group. The main outcome measures were postoperative distance uncorrected and best corrected visual acuity; near uncorrected, distance corrected, and near corrected visual acuity; and accommodative range based on defocus curves. RESULTS: Twenty-four eyes were available at the 6-month follow-up visit. All eyes had best corrected distance visual acuity of 20/40 or better, and 19 eyes (79%) had an uncorrected distance visual acuity of 20/40 or better. Uncorrected near visual acuity was 20/40 or better in all eyes. With distance correction, 23 eyes (96%) had an acuity of 20/40 or better at near. Defocus curve analysis suggested a mean accommodative range of 3.22 diopters (D) +/- 0.88 (SD) (range 1.00 to 5.00 D) in the accommodating IOL group and 1.65 +/- 0.58 D in the control group (range 1.00 to 2.50 D) (P<.05). CONCLUSION: The Synchrony dual-optic IOL shows promise as an option to provide accommodative function in pseudophakic patients.