Comparison of surgically induced astigmatism in various incisions in manual small incision cataract surgery

AIMTo determine the surgically induced astigmatism (SIA) in Straight, Frown and Inverted V shape (Chevron) incisions in manual small incision cataract surgery (SICS).

Comparison of surgically induced astigmatism among different surgeons performing the same incision

To compare surgically induced astigmatism （SIA） of different surgeons, who perform the same main incision. Two hundred and seventy eyes underwent cataract surgery with phacoemulsification by four different surgeons （A, B, C, and D）. A 3-step, 3.0 mm, superotemporal for the right eye and superonasa! for the left eye clear corneal incision was performed. A comparison in SlA among A, B, C and D surgeon was made. No significant difference was found in SlA at both first and sixth postoperative month between different surgeons （P〉0.05）. SIA is more dependent on incisional characteristics and preoperative astigmatism and less on the surgeon.

Comparison of surgically induced astigmatism in patients with horizontal rectus muscle recession

·AIM: To compare surgically induced astigmatism(SIA)following horizontal rectus muscle recession surgery between suspension recession with both the 'hang-back' technique and conventional recession technique.·METHODS: Totally, 48 eyes of 24 patients who had undergone horizontal rectus muscle recession surgery were reviewed retrospectively. The patients were divided into two groups. Twelve patients were operated on by the hang-back technique(Group 1), and 12 by the conventional recession technique(Group 2). SIA was calculated on the 1stwk, 1stand in the 3rdmo after surgery using the SIA calculator.·RESULTS: SIA was statistically higher in the Group 1all postoperative follow-up. SIA was the highest in the 1st wk, and decreased gradually in both groups.·CONCLUSION: The suspension recession technique induced much more SIA than the conventional recession technique. This difference also continued in the following visits. Therefore, the refractive power should be checked postoperatively in order to avoid refractive amblyopia.Conventional recession surgery should be the preferred method so as to minimize the postoperative refractive changes in patients with amblyopia.

Surgically Induced Corneal Astigmatism Following Cataract Surgery

Aim: To study the surgically induced astigmatism (SIA) caused by two different type main incisions in phacoemulsification. Methods: Sixty-eight eyes of 65 patients who underwent phacoemul-sification were randomly divided into two groups according to main incision type: 2.8 mm superior limbal incision (in Group 1) and 2.8 mm upper clear corneal incision (in Group 2). Surgical techniques did not differ between the groups except for the main incisions. All patients received detailed ophthalmological examination in addition to keratometry at the pre- and post-operatively. The preoperative and postoperative astigmatisms were calculated by the vector analysis method and the SIA was compared between the groups. Results: The mean SIA values were 1.3 ± 0.67 D, 0.89 ± 0.47 D, 0.77 ± 37 D in Group 1 and 1.42 ± 0.62 D, 1.15 ± 0.54 D, 0.94 ± 0.47 D in Group 2 on the first day, first week and first month postoperatively, respectively. According to the vector analysis, SIA was less in Group 1 than Group 2;although the difference was not statistically significant (p > 0.05). Conclusion: Although less astigmatism was detected in the superior limbal incision group, this difference was not statistically significant.

Surgically induced astigmatismCorneal astigmatismMeanSummated vector meanCentroidVector analysisTemporal incisionSuperior incisionICL implantation

BackgroundTo compare the arithmetic mean (M-SIA) and the summated vector mean of surgically induced astigmatism (SVM-SIA) according to the incision site after phakic intraocular lens (Visian implantable collamer lens (ICL), STAAR Surgical) implantation.MethodsThis study comprised 121 eyes of 121 consecutive patients undergoing ICL surgery through a 3.0-mm temporal or superior clear corneal incision. The magnitude and the axis of corneal astigmatism preoperatively and 3 months postoperatively were measured using an automated keratometer. The M-SIA and the SVM-SIA were determined according to the incision site.ResultsThe magnitude of corneal astigmatism significantly increased from 1.23 ± 0.59 D preoperatively to 1.46 ± 0.72 D postoperatively in the temporal incision group (Wilcoxon signed-rank test, P < 0.001), but it significantly decreased from 1.09 ± 0.36 D preoperatively to 0.86 ± 0.41 D postoperatively in the superior incision group (P < 0.001). The M-SIA was 0.48 ± 0.30 D, and the SVM-SIA was 0.23 ± 0.52 D at a meridian of 82° in the temporal incision group. The M-SIA was 0.57 ± 0.30 D, and the SVM-SIA was 0.47 ± 0.45 D at a meridian of 1° in the superior incision group.ConclusionsICL implantation induces the M-SIA by approximately 0.5 D, but the SVM-SIA decreased to 50% and 80% of the M-SIA in magnitude through temporal and superior incisions, respectively. The direction of the SVM-SIA showed a tendency toward corneal flattening to the incisional site. It should be noted that the M-SIA is somewhat different from the SVM-SIA according to the incision site.

Comparison of magnitude and summated vector mean of surgically induced astigmatism vector according to incision site after phakic intraocular lens implantation

Background:To compare the arithmetic mean(M-SIA)and the summated vector mean of surgically induced astigmatism(SVM-SIA)according to the incision site after phakic intraocular lens(Visian implantable collamer lens(ICL),STAAR Surgical)implantation.Methods:This study comprised 121 eyes of 121 consecutive patients undergoing ICL surgery through a 3.0-mm temporal or superior clear corneal incision.The magnitude and the axis of corneal astigmatism preoperatively and 3 months postoperatively were measured using an automated keratometer.The M-SIA and the SVM-SIA were determined according to the incision site.Results:The magnitude of corneal astigmatism significantly increased from 1.23±0.59 D preoperatively to 1.46±0.72 D postoperatively in the temporal incision group(Wilcoxon signed-rank test,P<0.001),but it significantly decreased from 1.09±0.36 D preoperatively to 0.86±0.41 D postoperatively in the superior incision group(P<0.001).The M-SIA was 0.48±0.30 D,and the SVM-SIA was 0.23±0.52 D at a meridian of 82°in the temporal incision group.The M-SIA was 0.57±0.30 D,and the SVM-SIA was 0.47±0.45 D at a meridian of 1°in the superior incision group.Conclusions:ICL implantation induces the M-SIA by approximately 0.5 D,but the SVM-SIA decreased to 50%and 80%of the M-SIA in magnitude through temporal and superior incisions,respectively.The direction of the SVM-SIA showed a tendency toward corneal flattening to the incisional site.It should be noted that the M-SIA is somewhat different from the SVM-SIA according to the incision site.

The Comprehensive Control of Astigmatism during and Following Intraocular Lens Implantation.

The operating corneoloscope and Terry operative keratometer were used respectively in 29 and 34 eyes during the intraocular lens implantation to measure the corneal astigmatism qualitatively or quantitatively,so that the tension of incision closure could be adjusted. The surgically induced astigmatism in qualitative group two weeks after the operation was 3. 5 ± 1. 70 D and that in quantitative group was 2. 56±1. 60 D. There were 55.17% and 38. 24% of the eyes with over 2. 00 D corneal astigmatism in qu...

Incision Site in Manual Small Incision Cataract Surgery in Case of Preoperative Direct Astigmatism

We compared surgically induced astigmatism (SIA) by a superior incision with a temporal incision in manual small incision cataract surgery (MSICS), in patients with bilateral direct (regular) preoperative corneal astigmatisms. Patients and method: We carried out a prospective study from July 1st 2018 to September 30th 2019 in the department of ophthalmology at the University Hospital of Brazzaville. Keratometric readings were recorded before surgery to assess preoperative corneal astigmatisms. Keratometric evaluation was done 45 days post-operatively. Patients were followed 90 days after surgery in order to assess the healing of the surgical site. The surgically induced astigmatism (SIA) is the difference in the magnitude vectors between the preoperative and postoperative astigmatism. The result was positive if the postoperative astigmatism was greater than the preoperative astigmatism and negative if the postoperative astigmatism was less than the preoperative astigmatism. Results: Our study sample included 48 eyes from 24 patients, including 24 operated on temporal incision and 24 in superior incision. The average SIA for superior incisions was 0.33 ± 1.55 diopters (D), versus 0.33 ± 1.44 for temporal incisions. For superior incisions the SIA was 0.81 for astigmatisms lower than 2D, against 0.16D for the temporal incisions. On the other hand, for preoperative astigmatisms greater than 2D, the surgically induced astigmatism was &plusmn;0.62D, marking a decrease in preoperative astigmatism for the superior incisions against an increase of 0.5D for the temporal incisions. The healing was delayed for the temporal incisions responsible for discomfort persisting beyond 45 days. Conclusion: The temporal incision had better results than the superior incision for astigmatisms lower than 2D, and less good for astigmatisms higher than 2D. The temporal incision healed less well.

Modified Scleral Flap Incision to Reduce Corneal Astigmatism after Intraocular Lens Implantation

Purpose:To investigate a simple method during extracapsular cataract extraction with posteior chamber intraocular lens implantation in order to reduce surgically induced corneal astig-matism.Methods:A modified scleral flap incision was used in the extracapsular cataract extraction with intraocular lens implantation and the postoperative changes in conreal astigmatism was observed.Results:The peak value of postoperative corneal astigmatism was3.60D,and the corneal astigmatism regression was 2.11D,surgically induced astigmatism was less significant in modified scleral flap incision group than that in convention-al limbal incison group(P<0.05).Conclusions:The modified scleral flap inciston is an ideal incision for cataract ex-traction with intraocular lens implantation when phacoemulsifier is not avaliable.Eye Science1995;11:136-139.

人工晶状体保护下超声乳化白内障吸除术疗效及安全性评价:一项随机对照临床研究

目的观察人工晶状体(IOL)保护下超声乳化手术(PHACO)对硬核白内障患者的治疗效果。方法采用随机对照临床研究方法,连续纳入2019年1月至2022年5月于延边大学附属医院收治的Emery分级Ⅳ~Ⅴ级的硬核白内障患者120例120眼,按照随机数字表法分为PHACO组、IOL保护PHACO组和囊外白内障摘除术(ECCE)组,分别行常规PHACO、IOL保护下的PHACO和ECCE,每组40例40眼。最终99例受试者完成随访,其中PHACO组30例30眼,IOL保护PHACO组35例35眼,ECCE组34例34眼。记录各组总手术时间、术中超声乳化时间、累计释放能量。术后随访3个月,检测并比较3个组患眼角膜内皮细胞密度(ECD)、角膜内皮细胞面积变异系数(CV)、角膜六角形内皮细胞比率(6A)、角膜散光值,不同等级裸眼远视力的眼数分布;记录术中和术后并发症发生情况。结果IOL保护PHACO组与PHACO组超声能量及超声时间比较差异均无统计学意义(P=0.691、0.982)。IOL保护PHACO组和PHACO组总手术时间分别为(38.81±2.73)和(36.45±3.45)min,明显短于ECCE组的(69.60±4.35)min,差异均有统计学意义(均P<0.001)。术前3个组患者年龄、性别、晶状体核硬度等基本资料比较,差异均无统计学意义(均P>0.05)。术后3个月,PHACO组和IOL保护PHACO组裸眼视力较高的人数较ECCE组高(P=0.006、0.007);IOL保护PHACO组的ECD和6A分别为(2155.57±177.88)/mm^(2)和(41.31±5.18)%,均显著高于PHACO组的(1912.64±224.11)/mm^(2)和(36.18±3.27)%,IOL保护PHACO组的CV为(50.34±5.90)%,低于PHACO组的(55.67±3.30)%,差异均有统计学意义(P=0.007、0.003、0.005)。术后1周和3个月,IOL保护PHACO组的角膜散光度数均显著低于ECCE组,且高于PHACO组,差异均有统计学意义(均P<0.05)。结论IOL保护下的PHACO相对常规PHACO可有效减少超声能量对角膜内皮的损伤,相对ECCE能明显缩短手术时间,减轻术后炎症反应,且并未明显增加术后角膜散光。IOL保护下的PHACO是硬核白内障患者一种有效的改良手术方式。

Refractive outcomes after V4c Toric collamer lens implantation over 1y of follow-up

AIM:To evaluate refractive outcomes and corneal astigmatism changes after Toric implantable collamer lens with a central port(V4c T-ICL)implantation over 1y of follow-up.METHODS:A retrospective study was performed including 50 eyes of 50 patients that underwent V4c T-ICL implantation.Uncorrected(UDVA)and corrected(CDVA)distance visual acuities,refraction,refractive and corneal astigmatism changes and corneal coupling correction were evaluated preoperatively,1 and 12mo postoperatively.Vector analysis was used for astigmatism changes.Coefficient of adjustment(CAdj)was calculated for corneal coupling analysis.RESULTS:The mean UDVA achieved was 0.03 logMAR at 1mo and remained unchanged throughout the whole follow-up(P=0.193).At the last visit,84%of the eyes achieved a CDVA of 0.00 logMAR or better.Regarding spherical equivalent refraction(SEQ),96%of eyes were ranges of±1.00 D and 84%of them within±0.50 D.Also,94%of eyes had a remaining refractive cylinder within±1.00 D and 78%of them within±0.50 D.Both,SEQ and refractive cylinder,remain stable over the postoperative follow-up(P=1.000 and P=0.660,respectively).In terms of surgically induced astigmatism(SIA),no statistically significant differences were found over the follow-up(P=0.102)and under correction was found with a correction index lower than the unit at each visit.A keratometric astigmatism induced of 0.59±0.53(vector mean:0.26×73º)D was reached at the last visit.No significant changes in terms of corneal astigmatism orientation were reported over post-surgery visits(P=0.129 and P=0.097 at 1 and 12mo respectively).No clinical significance was found for CAdj on with-the-rule astigmatism.No postoperative complications resulting from the surgery were found.CONCLUSION:Refractive outcomes suggest that the V4c T-ICL implantation for correction of myopic astigmatism was satisfactory in terms of effectiveness,safety,and stability during 1y of follow-up.Corneal astigmatism induced by the incision around 0.5 D is achieved according to the remaining refractive cylinder found at one-year post-surgery.Corneal coupling analysis results in no unexpected spherical change.

The impact of posterior corneal astigmatism on the surgical planning of toric multifocal intraocular lens implantation

Purpose:To investigate the influence of posterior corneal astigmatism on the prediction accuracy of toric multi­focal intraocular lens(IOL)calculation.Methods:The keratometric astigmatism measured by Lenstar LS 900(KCA_(L)),keratometric astigmatism(KCAp)and total corneal astigmatism(TCA)measured by Scheimpflug camera(Pentacam HR)were documented and analyzed accordingly.Three deduction models using different parameters were compared.Model 1:KCA_(L)+keratometric comeal surgically induced astigmatism(KCSIA,0.30 D@50°);Model 2:KCA_(P)+KCSIA);Model 3:TCA 4-total CSIA(TCSIA,0.23 D@50°).The prediction errors of each model as the difference vector between the actual and the intended residual astigmatism were compared.Results:Seventy-six eyes implanted with toric multifocal IOLs were included in this study.The vector differences of the actual KCSIA and TCSIA were statistically significant in the total sample and against-the-rule(ATR)sub­group(both P<0.05).Model 1 deduced the smallest mean values of prediction error,while that of Model 3 were smaller than that of Model 2,both in the total sample and the ATR subgroups(all P<0.05).Meanwhile,in the total sample and ATR subgroups,the centroid vector magnitudes of Model 3 were smaller than that of Model 1(0.31±0.76 D and 0.39±0.76 D).Conclusions:The calculation of toric multifocal IOL should be individualized especially in the ATR eyes for the impact of PCA on the estimation of the preoperative comeal astigmatism and the CSIA.

白内障超声乳化术源性散光影响因素分析

目的观察白内障超声乳化术源性散光(surgically induced astigmatism,SIA)的影响因素。方法对2021年12月-2022年3月的69例具有角膜规则散光的白内障患者进行白内障超声乳化手术,术后观测以角膜顶点为中心3 mm、5 mm、7 mm直径范围内的角膜前表面、后表面以及角膜前表面的模拟角膜屈率(Sim K)的SIA,使用矢量分析计算XSIA、YSIA和SIA均值(|SIA|),并对SIA与年龄、眼轴长度(axial length,AL)、前房深度(anterior chamber depth,ACD)、角膜直径(white-to-white,WTW)、中央角膜厚度(central corneal thickness,CCT)使用Pearson相关性分析,使用多元线性回归进行SIA影响因素的分析。结果69例患者的平均年龄为(63.25±14.74)岁,其中男性28例(40.58%)。分析发现,Sim K的|SIA|与WTW呈负相关(r=-0.265,P=0.028);3 mm、5 mm、7 mm前表面|SIA|与WTW呈负相关(r=-0.320,P=0.007;r=-0.337,P=0.005;r=-0.287,P=0.017);3 mm、5 mm、7 mm后表面|SIA|与AL呈负相关(r=-0.390,P=0.001;r=-0.352,P=0.003;r=-0.317,P=0.008)。多元回归分析结果显示,WTW与Sim K、3 mm、5 mm、7 mm前表面及3 mm后表面的|SIA|呈负相关(B=-0.261,P=0.047;B=-0.387,P=0.016;B=-0.323,P=0.009;B=-0.297,P=0.041;B=-0.085,P=0.049),而与3 mm前表面XSIA、5 mm、7 mm前表面YSIA呈正相关(B=0.347,P=0.040;B=0.318,P=0.034;B=0.403,P=0.010);AL与3 mm、5 mm后表面的|SIA|呈负相关(B=-0.023,P=0.021;B=-0.034,P=0.030)。结论在进行白内障超声乳化手术时,应考虑患者的眼部生物参数,如眼轴长度、角膜直径等对SIA的影响。

小切口囊外摘除术与超声乳化术治疗白内障疗效比较

目的:探究小切口囊外摘除术与超声乳化术对白内障患者角膜内皮细胞数目、黄斑区厚度及手术源性角膜散光的影响。方法:回顾性研究。选取我院2019-05/2023-02收治的年龄相关性白内障患者296例296眼。根据手术方式分为小切口囊外摘除术组144眼与超声乳化术组152眼。比较两组患者术前,术后7d,1、3mo裸眼视力、最佳矫正视力、角膜内皮细胞数目、黄斑区厚度、手术源性角膜散光及术后并发症发生情况。结果:小切口囊外摘除术组患者术后7d裸眼视力和最佳矫正视力均优于超声乳化术组,术后7d,1、3mo角膜内皮细胞数目均高于超声乳化术组,术后7d,1mo黄斑区厚度均低于超声乳化术组,术后角膜水肿发生率及总并发症发生率均低于超声乳化术组(均P<0.05),但术后1、7d,1、3mo手术源性角膜散光值与超声乳化术组比较均无差异(P>0.05)。结论:相较于超声乳化术,小切口囊外摘除术术后角膜内皮细胞数目及黄斑区厚度变化较小,视力恢复更快,并发症减少。

改良2.5mm辅助切口在小切口非超声乳化白内障手术中减少手术性散光的作用

目的探讨构建角膜缘2.5mm辅助切口对小切口非超声乳化白内障手术后手术性散光的影响。方法回顾性分析我院近年来行小切口非超声乳化白内障手术Ⅳ-Ⅴ级白内障患者的临床资料,我们将患者分为2组,对照组:行传统手法无缝线小切口非超声乳化白内障手术(manual sutureless small incision cataract surgery,MSICS)共36例,观察组:MSICS术中构建2.5mm辅助切口且行劈核患者42例。比较两组患者术后不同时间手术性散光值,术后裸眼视力,术中、术后并发症发生率。所有手术均由熟练掌握小切口手术的医师完成。结果术后1周、2周,观察组手术性散光值分别为(1.29±0.51)D与(1.05±0·45)D小于对照组的(1.69±0.61)D和(1.42±0.53)D,差异有统计学意义(F=7.23,P=0.009);术后1个月、2个月时,2组的手术性散光值比较差异无统计学意义(F=2.29,P=0.134)。术后1周、2周,观察组裸眼视力分别为0.59±0.14、0.63±0·16,优于对照组0.52±0.11和0.56±0·12,差异具有统计学意义(F=5.588,P=0.021);术后1个月、2个月时,2组的裸眼视力比较差异无统计学意义(F=1.173,P=0·187)。观察组术中、术后并发症发生率较对照组少。结论硬核患者MSICS术中构建2.5mm辅助切口减少了术后早期手术性散光,同时减少术中、术后并发症,具有一定实用性及有效性。

不同手术切口对超声乳化白内障术后角膜散光的影响

目的:研究两种不同的超声乳化手术切口对年龄相关性白内障术后患者角膜散光的影响。方法:将2011-08/12期间行超声乳化吸除术的白内障患者随机分为2组,上方巩膜缘11∶00～12∶00处手术切口组(A组)30例32眼;颞侧(9∶00或3∶00)3.2mm宽的透明角膜切口组(B组)32例35眼;利用角膜曲率仪测量白内障术前、术后不同时间的角膜屈光状态,比较A组与B组不同的超声乳化手术切口对术后角膜散光的影响,分别比较两组术前,术后1wk;1,3mo的角膜散光改变,所有实验数据以平均值±标准差表示,统计分析采用t检验,以P<0.05表示差异有统计学意义。结果:两组术前、术后1wk的角膜曲率差异无统计学意义(P>0.05),术后1,3mo的差异经统计分析P<0.05,A组的手术源性散光大于B组。结论:选择颞侧透明角膜切口的白内障超声乳化术,手术用时短,手术并发症少,术后对角膜散光影响小。不同手术切口的白内障超声乳化对角膜内皮细胞的影响无显著差异。

两种不同切口超声乳化术对合并低度角膜散光白内障患者的角膜散光和视力的影响

目的观察在合并低度角膜散光的白内障患者中行陡峭轴角膜切口和颞侧角膜切口超声乳化术后角膜散光和视力的变化。方法将我院收治的合并角膜散光≤0.50 D的年龄相关性白内障患者共60例(60眼)根据术中切口不同分成A、B两组。A组30例行陡峭轴切口,B组30例行颞侧角膜切口。观察术前及术后1周、1个月、3个月裸眼视力(uncorrected visual acuity,UCVA)、最佳矫正视力(best corrected visual acuity,BCVA)、角膜散光、术源性散光(surgically induced astigmatism,SIA),并进行统计学分析。结果术后1个月、3个月,A组UCVA均优于B组(均为P<0.05);两组术后各时间点BCVA比较差异均无统计学意义(均为P>0.05),但均较术前明显提高(均为P<0.05)。A组UCVA术后3个月优于术后1个月、术后1个月优于术后1周,差异均有统计学意义(均为P<0.05)。A组BCVA于术后1个月基本稳定。术后1周、1个月、3个月,A组角膜散光均低于B组(均为P<0.05)。A组角膜散光术后3个月为(0.26±0.20)D,略低于术前的(0.32±0.13)D,但差异无统计学意义(P=0.42)。B组术后3个月角膜散光为(0.62±0.45)D,高于术前的(0.23±0.17)D,差异有统计学意义(P<0.05)。术后1周A组SIA为(1.28±0.63)D,高于B组的(0.77±0.39)D,差异有统计学意义(P=0.01)。术后1个月、3个月两组SIA比较差异均无统计学意义(均为P>0.05)。结论术前角膜散光≤0.50 D的白内障患者行白内障超声乳化手术时,选择陡峭轴切口并不能矫正术前角膜散光,但能减小术后总角膜散光,且可以有效提高术后UCVA,术后效果优于颞侧角膜切口。

不同位置角膜切口白内障超声乳化对角膜表面形态的影响

目的探讨颞侧和上方3.2mm透明角膜切口白内障超声乳化联合折叠式人工晶状体植入术对角膜表面形态的不同影响。方法收集老年性白内障患者44例54眼,将患者随机分为颞侧透明角膜切口组(A组)和上方透明角膜切口组(B组)。检查术前、术后1d、1周、1个月和3个月视力、手术源性散光(surgically induced astigmatism,SIA)和角膜地形图。结果术后1d、1周、1个月、3个月,A组SIA分别为(0.70±0.34)D、(0.64±0.29)D、(0.60±0.27)D、(0.55±0.26)D,B组分别为(1.18±0.48)D、(1.05±0.42)D、(0.88±0.38)D、(0.77±0.35)D。术后1d,A组SIA较B组小,差异有统计学意义(P<0.05);随着时间的推移,2组SIA逐渐有减小趋势,但A组SIA仍小于B组,术后3个月差异仍有统计学意义(P<0.05)。术后1d,2组角膜表面非对称性指数(surface asymmetry index,SAI)、角膜表面规则指数(surface regularity index,SRI)均较术前增大,差异有统计学意义(P<0.05),其中A组的SAI、SRI较B组小,差异有统计学意义(P<0.05)。术后1周,A组SAI、SRI同术前相比差异无统计学意义(P>0.05);B组SAI、SRI仍比术前高,差异有统计学意义(P<0.05)。术后1个月、3个月2组SAI、SRI同术前相比差异均无统计学意义(P>0.05),2组之间各相应时间点SAI、SRI的差异也均无统计学意义(P>0.05)。结论颞侧透明角膜切口操作方便,术后SIA、SAI、SRI均小于上方透明角膜切口,对角膜表面形态的影响小,术后早期视力恢复好,是较理想的手术切口方位。

直线巩膜隧道切口可拆除缝线小梁切除术联合丝裂霉素C在闭角型青光眼中的应用

目的:将直线巩膜隧道切口应用于可拆除缝线小梁切除术联合丝裂霉素C(mytomycinC,MMC)治疗闭角型青光眼,探讨其疗效和并发症。方法:将同期连续原发性闭角型青光眼患者分为:A组:直线巩膜隧道切口可拆除缝线小梁切除术+MMC,98例,128眼;B组:可拆除缝线小梁切除术+MMC,71例,95眼;C组:小梁切除术+MMC,48例,60眼。比较3组疗效和并发症。结果:3组术后1年手术成功率差异无显著性。浅前房和低眼压:A、B组差异无显著性,但都低于C组;高眼压和脉络膜脱离3组间差异无显著性。术后角膜散光量:A组术后2周增高不明显(P>0.1),术后1年时接近术前水平;B、C组术后2周明显增高,术后1年时仍明显高于术前(P<0.005)。术后角膜极向散光值:3组术后早期明显增高,出院后逐渐下降。结论:直线巩膜隧道切口可拆除缝线小梁切除术+MMC与另两种术式相比,疗效相当,但术性角膜散光较小,3种术式都可以引起顺规性散光,随着时间延长,向逆规性散光漂移。可拆除缝线技术的应用有利于减少术后早期并发症。

飞秒激光白内障手术术源性散光及术后角膜像差的变化研究

目的分析飞秒激光辅助的白内障超声乳化手术的术源性散光及术后角膜高阶像差的变化。方法分析2014年4月至2015年8月在我院接受白内障手术的50例(60只眼)年龄相关性白内障患者,分为两组:飞秒组27例(30只眼),使用美国Alcon Lenx白内障激光手术系统制作角膜切口、截囊及劈核;超声乳化组23例(30只眼),使用手术刀制作角膜切口、手工连续环形撕囊及劈核。对两组所有术前、术后3个月的术眼使用角膜地形图Pentacam HR测量全角膜散光和角膜6 mm直径范围内的全角膜高阶像差,使用Alpins方法分析全角膜散光,取术源性散光的大小与轴向、矫正率及误差角分析比较。结果飞秒组与超声乳化组术源性散光无明显差异(P>0.05);飞秒组术前与术后3个月全角膜高阶像差各项参数均无明显差异(P均>0.05);而超声乳化组术后3个月全角膜总像差及总高阶像差较术前明显增加(P<0.05)。结论飞秒激光制作角膜切口没有引起全角膜高阶像差的明显改变,飞秒激光制作角膜切口与手工制作角膜切口相比,精准性及术后稳定性更好。