Evaluation of anterior and posterior surfaces of the cornea using a dual Scheimpflug analyzer in keratoconus patients implanted with intrastromal corneal ring segments

AIM: To evaluate corneal parameters measured with a dual Scheimpflug analyzer in keratoconus patients implanted with intrastromal corneal ring segments (ICRS). METHODS: Fifty eyes of 40 keratoconus patients had Ferrara ICRS implantation from November 2010 to April 2014. Uncorrected visual acuity (UCVA), best corrected visual acuity (BCVA), refraction, keratometry, asphericity, elevation, pachymetry, root mean square (RMS), spherical aberration and coma were studied. All patients were evaluated using a dual Scheimpflug system. RESULTS: The mean follow-up time after the procedure was 12.7mo. The mean UCVA improved from 0.82 to 0.31 (P<0.001); the mean BCVA improved from 0.42 to 0.05 (P<0.0001), the mean spherical refraction changed from -3.06±3.80 D to -0.80±2.5 D (P<0.0001) and the mean refraction astigmatism reduced from -4.51±2.08 D to -2.26±1.18 D (P<0.0001). The changes from preoperative to postoperative, in parameters of the anterior and posterior surface of the cornea, were statistically significant except the elevation posterior at the apex of the cornea and posterior asphericity. CONCLUSION: The implantation of Ferrara ICRS induces changes in both anterior and posterior surfaces of the cornea.     

Photorefractive keratectomy after cataract surgery in uncommon cases: long-term results

AIM: To evaluate the efficacy and safety of the excimer laser correction of the residual refractive errors after cataract extraction with intraocular lens (IOL) implantation in uncommon cases. METHODS: Totally 24 patients with high residual refractive error after cataract surgery with IOL implantation were examined. Twenty-two patients had a history of phacoemulsification and IOL implantation, and two had extra-capsular cataract extraction with IOL implantation. Detailed examination of preoperative medical records was done to explain the origin of the post-cataract refractive errors. All patients underwent photorefractire keratectomy (PRK) enhancement. The mean outcome measures were refraction, uncorretted visual acuity (UCVA), best corrected visual acuity (BCVA) and corneal transparency and follow up ranged from 1 to 8y. RESULTS: The principal causes of residual ametropia was inexact IOL calculation in abnormal eyes with high myopia and congenital lens abnormalities, followed by corneal astigmatism both suture induced and preexisting. After cataract surgery and before the laser enhancement the mean spherical equivalent (SE) was -0.56±3 D ranging from -4.62 to +2.25 D in high myopic patients, instead it was -1±1.73 D ranging from -3.25 to +3.75 D in the astigmatic eyes, with a mean cylinder of -3.75±0 ranging from -3 to +5.50 D. After laser refractive surgery the mean SE was 0.1±0.73, ranging from -0.50 to +1.50 in the myopic group, and it was -0.50±0.57 ranging from -1.25 to +0.50 in astigmatic patients, with a mean cylinder of -0.25±0.75. In myopic patients the mean UCVA and BCVA were 0.038±0.072 logMAR and 0.018±0.04 respectively, both ranging from 0.10 to 0.0. In astigmatic patients, the mean UCVA and BCVA were 0.213±0.132 and 0.00±0.0 respectively, UCVA ranging from 0.50 to 0.22 and BCVA was 0.00. All patients presented normal corneal transparency. No ocular hypertension was detected and no corneal haze was observed. All registered values remained stable also at the end line evaluation. CONCLUSION: The excimer laser treatment of residual refractive errors after cataract surgery with IOL implantation in abnormal eyes resulted in satisfactory and stable visual outcome with good safety and efficacy.     

单切口植入有晶状体眼后房型人工晶状体治疗高度近视

目的：评价单切口有晶状体眼后房型人工晶状体植入术治疗高度近视的有效性和安全性。

方法：对9例18眼高度近视患者行有晶状体眼后房型人工晶状体植入术。术后随访3～9mo,观察手术前后裸眼视力、最佳矫正视力、屈光度、散光变化、眼压、内皮细胞计数等。

结果：所有患者成功植入眼内接触镜(implantable contact lens,ICL),18眼手术前后平均屈光度分别为-13.38±-5.32,

-0.25±0.38D; 手术前后裸眼视力分别为0.06±0.04,0.6±0.2; 最佳矫正视力分别为0.5±0.3,0.7±0.3; 术后裸眼视力和最佳矫正视力均明显好于术前(P<0.05)。术前平均眼压为13.23±3.18mmHg,术后平均眼压为15.03±1.25mmHg; 内皮细胞计数术前为3 008±298个/mm²,术后为2 896±246个/mm²; 前房深度术前平均为3.56±0.29mm,术后为3.68±0.37mm,角膜散光术前0.52±0.30D,术后角膜散光0.67±0.45D,差异均无统计学意义(P>0.05)。

结论：单切口植入有晶状体眼后房型人工晶状体矫正高度近视近期临床效果有效、可靠,具有手术操作风险低、眼表损伤小、成本低、术源性散光小的优点,为一种适用的手术方式。     

【In Press】Photorefractive keratectomy after cataract surgery in uncommon cases. Long-term results

AIM: To evaluate the efficacy and safety of the excimer laser correction of the residual refractive errors after cataract extraction with intraocular lens (IOL) implantation in uncommon cases. METHODS: 24 patients with high residual refractive error after cataract surgery with IOL implantation were examined. Twenty-two patients had a history of phacoemulsification and IOL implantation, and two had extra-capsular cataract extraction with IOL implantation. Detailed examination of preoperative medical records was done to explain the origin of the post-cataract refractive errors. All patients underwent PRK enhancement. The mean outcome measures were refraction, UCVA, BCVA and corneal transparency and follow up ranged from 1 to 8y. RESULTS: The principal causes of residual ametropia was inexact IOL calculation in abnormal eyes with high myopia and congenital lens abnormalities, followed bycorneal astigmatism both suture induced and preexisting. After cataract surgery and before the laser enhancement the mean SE was -0.56±3 D ranging from -4.62 to +2.25 D in high myopic patients, instead it was -1±1.73 D ranging from -3.25 to +3.75 D in the astigmatic eyes, with a mean cylinder of -3.75±0 ranging from -3 to +5.50. After laser refractive surgery the mean SE was 0.1±0.73, ranging from -0.50 to +1.50 in the myopic group, and it was -0.50 ±0.57 ranging from -1.25 to +0.50 in astigmatic patients, with a mean cylinder of -0.25 ±0.75. In myopic patients the mean UCVA and BCVA were 0.038 Log MAR ±0.072 and 0.018 ±0.04 respectively, both ranging from 0.10 to 0.0. In astigmatic patients, the mean UCVA and BCVA were 0.213±0.132 and 0.00±0.0 respectively: UCVA ranging from 0.50 to 0.22 and BCVA was 0.00. All patients presented normal corneal transparency. No ocular hypertension was detected and no corneal haze was observed. All registered values remained stable also at the end line evaluation. CONCLUSIONS: The excimer laser treatment of residual refractive errors after cataract surgery with IOL implantation in abnormal eyes resulted in satisfactory and stable visual outcome with good safety and efficacy.     

Clinical outcomes after intrastromal corneal ring segments reoperation in keratoconus patients

AIM:To evaluate the clinical outcomes after Ferrara intrastromal corneal ring segments (ICRS) reoperation in patients with keratoconus.RESULTS: The mean follow-up time after the reoperation was 30.5±9.7 months. The mean UCVA improved from 20/300 to 20/80 (P=0.005); the mean BCVA improved from 20/160 to 20/50 (P=0.0002), the mean keratometry reduced from 49.33±4.19D to 46.16±3.90D (P=0.0001), the mean pachymetry at the thinnest point increased from 450±42.9mm to 469±40.8mm (P=0.0001). The asphericity increased from -0.84±0.74 to -0.35±0.81 (P=0.15) and the spherical equivalent reduced from -4.64±4.87D to -3.04±3.45D (P=0.137). The changes in the asphericity and spherical equivalent were not statistically significant.CONCLUSION: Ferrara ICRS implantation showed to be a reversible and readjustable surgical procedure for keratoconus treatment. Good outcomes can be obtained even after removal, addition, reposition or exchange of ICRS.     

Photorefractive keratectomy for residual myopia after cataract surgery

PURPOSE: To evaluate the effectiveness, predictability, and safety of photorefractive keratectomy (PRK) for correcting residual myopia and myopic astigmatism after cataract surgery with intraocular lens implantation. SETTING: Refractive Surgery and Cornea Unit, Instituto Oftalmológico de Alicante, Alicante, Spain. METHODS: Thirty consecutive eyes (30 patients) had PRK for residual myopia after cataract surgery. Surface PRK with a VISX Twenty-Twenty excimer laser was used in all patients. Follow-up was 1 year. RESULTS: Before PRK, no eye had an uncorrected visual acuity (UCVA) of 20/40 or better. Twelve months after PRK, 16 eyes (53.33%) had a UCVA of 20/40 or better. After PRK, best corrected visual acuity (BCVA) improved 1 line or more in 14 eyes (46.66%) over the preoperative values, and 15 eyes (50.00%) had the same BCVA as before PRK. Mean pre-PRK refraction of -5.00 diopters (D) +/- 2.50 (SD) decreased significantly to -0.25 +/- 0.50 D at 12 months (P < .001). At 12 months, the spherical equivalent was within +/- 1.00 D of emmetropia in 27 eyes (90.00%). No vision-threatening complications occurred. CONCLUSION: Photorefractive keratectomy was an effective, predictable, and safe procedure for correcting residual myopia and myopic astigmatism after cataract surgery.     

Intrastromal ring segment insertion using a femtosecond laser to correct pellucid marginal corneal degeneration

PURPOSE: To assess the outcomes of intrastromal ring segment (Intacs, Addition Technology) implantation using a femtosecond laser in patients with pellucid marginal corneal degeneration. SETTING: Kudret Eye Hospital, Ankara, Turkey. METHODS: In this retrospective noncomparative case series, 9 eyes of 6 patients with pellucid marginal corneal degeneration had implantation of Intacs segments by a femtosecond laser technique. Preoperative and postoperative evaluations included slitlamp examination, uncorrected (UCVA) and best corrected (BCVA) visual acuities, and keratometry by a Pentacam Scheimpflug camera (Oculus Opticgerate GmbH). All parameters were reviewed within 6 months. RESULTS: Intacs were successfully implanted in all eyes. The UCVA significantly improved from preoperatively to 6 months after Intacs implantation (mean 0.18 +/- 0.24 [SD] and 0.53 +/- 0.23, respectively). The mean difference between the preoperative and postoperative UCVA was 3.5 +/- 1.6 lines (P = .008). The BCVA also significantly improved from preoperatively to 6 months after implantation (mean 0.63 +/- 0.26 and 0.85 +/- 0.18 at 6 months, respectively). The Snellen BCVA was 1.0 in 5 eyes postoperatively. The mean difference between preoperative and postoperative BCVA was 2.3 +/- 51 lines (P = .011). The mean preoperative spherical refraction decreased from -3.86 +/- 2.91 diopters (D) to -2.77 +/- 1.43D (P = .091) and the mean cylindrical refraction, from -2.41 +/- 2.27 D to -0.94 +/- 1.07 D (P = .046). The mean central corneal curvature decreased from 48.20 +/- 4.19 D preoperatively to 46.90 +/- 5.00 D (P = .008) at 6 months and the mean posterior elevation, from 53.88 +/- 21.72 microm to 32.55 +/- 11.23 microm (P = .008). CONCLUSION: Intacs insertion using a femtosecond laser was safe and efficient in the correction of pellucid marginal corneal degeneration.     

Verisyse虹膜固定型人工晶状体植入治疗高度近视的中长期疗效观察

目的:研究Verisyse虹膜固定型人工晶状体植入治疗高度近视中长期的有效性和安全性。方法:高度近视患者37例56眼植入Verisyse虹膜固定型人工晶状体,术后随访4～7a,对手术前后的裸眼和最佳矫正视力、屈光状态、眼压变化、角膜透明度及角膜内皮计数、前房、瞳孔和虹膜、自然晶状体改变及患者满意度进行观察分析。结果:所有眼术中均顺利植入Verisyse虹膜固定型人工晶状体,术后各时间点裸眼视力及最佳矫正视力均明显提高且保持稳定,各时间点角膜内皮细胞计数变化无统计学意义,随访期间无角膜内皮失代偿、顽固的色素膜炎、白内障、青光眼及视网膜脱离等严重并发症发生。结论:Verisyse虹膜固定型人工晶状体治疗高度近视是安全和有效的,能够显著提高裸眼视力及最佳矫正视力而并发症较少,对于不适合角膜手术的高度或超高度近视患者是一种比较理想的选择。     

中央孔型有晶状体眼后房型IOL植入术治疗中低度近视

目的：观察中低度近视患者植入中央孔型有晶状体眼后房型人工晶状体(ICL V4c)术后的疗效及安全性。

方法：选取2016-01/2017-06在我院接受ICL V4c植入术的中低度近视患者20例40眼,术后1wk,1mo,1a进行随访,观察UCVA、BCVA、SE、眼压、角膜内皮细胞计数、拱高、术后不良反应及并发症。

结果：术后UCVA、BCVA均较术前提高(P<0.01),术后1mo与术后1a UCVA无差异(P>0.05),其余时间点UCVA两两比较均有差异(P<0.05),术后各时间点BCVA两两比较均无差异(P>0.05)。术后SE均较术前降低(P<0.01),术后1wk平均SE接近0D。术后1a手术安全指数为1.05±0.14,手术有效性为1.07±0.14。术后各时间点与术前眼压均无差异(P>0.05)。术后1a角膜内皮细胞密度与术前无差异(P>0.05)。所有研究对象均未见白内障、青光眼、角膜内皮失代偿等。术后满意度为100%。

结论：ICL V4c植入术是治疗中低度近视安全而有效的方法,术后1mo后视力稳定。     

Piggyback技术在超高度近视合并白内障手术的应用

目的：观察piggyback(背驮式)散光矫正型人工晶状体\〖Toric intraocular lens(IOL)\〗植入在超高度近视合并角膜散光的白内障术中的临床应用效果。

方法：选取2010-01/2013-06因超高度近视合并年龄相关性白内障及角膜散光在我院行超声乳化白内障摘除联合IOL植入术的患者60例,按随机对照原则分为观察组和对照组,观察组30例行piggyback Toric IOL植入,背驮植入囊袋的两枚IOL分别为一枚正度数Acysoft IQ Toric IOL和一枚负度数折叠三片式IOL,对照组30例植入无散光矫正功能的普通折叠IOL。术后随访6mo,观察术后视力、IOL位置、术后残留散光及并发症等。

结果：术后6mo, 观察组裸眼视力从术前的3.52±0.03提高到4.78±0.01,对照组从术前的3.51±0.03上升到4.30±0.13,观察组裸眼视力明显高于对照组,差异有统计学意义(t =3.612, P <0.05)。两组术前角膜散光均较高,观察组1.70～4.27(平均2.97±0.87)D,对照组1.50～4.90(平均2.92±0.97)D,术后6mo观察组残留散光明显降低到0.25～1.00(平均0.48±0.23)D,而对照组仍残留散光1.00～5.20(平均2.87±1.11)D,两组间比较差异有统计学意义(t=-11.995,P<0.05)。术中及术后未见并发症。

结论：Piggyback Toric IOL植入术可帮助解决目前超高度近视合并角膜散光眼无匹配Toric IOL度数的难题,有效提高其白内障术后裸眼视力,降低散光。     

Clinical outcomes after implantation of a new intrastromal corneal ring with 140-degree of arc in patients with corneal ectasia

AIM: To evaluate the clinical and tomographic outcomes after implantation of a new intrastromal corneal ring segment (ICRS) with 140-degrees of arc in eyes with corneal ectasia. METHODS: We evaluated patients with corneal ectasia implanted with Ferrara 140° ICRS from April 2010 to February 2015. Outcome measures included preoperative and postoperative corrected distance visual acuity (CDVA), keratometry simulated (K) reading, tomographic astigmatism and asphericity. All patients were evaluated using the Pentacam Scheimpflug system. RESULTS: The study evaluated 58 eyes. The mean follow-up was 16.81±10.8mo. The CDVA (logMAR) improved from 0.5±0.20 (20/60) to 0.3±0.21 (20/40) (P<0.01). The average K reduced from 49.87±7.01 to 47.34±4.90 D (P<0.01). The asphericity changed from -0.60±0.86 to -0.23±0.67 D (P<0.01). The mean preoperative tomographic astigmatism decreased from -8.0±3.45 to -4.53±2.52 D (P<0.01). CONCLUSION: The new ICRS model with 140-degrees of arc effectively improve the visual acuity and reduce the high astigmatism usually found in patients with corneal ectasia.     

【In Press】 Clinical outcomes after implantation of a new intrastromal corneal ring with 140-degree of arc in patients with corneal ectasia

AIM: To evaluate the clinical and tomographic outcomes after implantation of a new intrastromal corneal ring segment (ICRS) with 140-degrees of arc in eyes with corneal ectasia. METHODS: We evaluated patients with corneal ectasia implanted with Ferrara 140° ICRS from April 2010 to February 2015. Outcome measures included preoperative and postoperative corrected distance visual acuity (CDVA), keratometry simulated (K) reading, tomographic astigmatism and asphericity (Q). All patients were evaluated using the Pentacam Scheimpflug system. RESULTS: The study evaluated 67 eyes. The mean follow-up was 16.81±13.96mo. The CDVA (logMAR) improved from 0.5±0.20 logMAR (20/60) to 0.3±0.21 logMAR (20/40) (P<0.01). The average K reduced from 49.8±7.01 D to 47.34±4.90 D (P<0.01). The asphericity changed from -0.60±0.86 to -0.23±0.67 (P<0.01). The mean preoperative tomographic astigmatism decreased from -8.0±3.45 D to -4.53±2.52 D (P<0.01). CONCLUSION: The new ICRS model with 140-degrees of arc effectively improved the visual acuity and reduced the high astigmatism usually found in patients with corneal ectasia.     

超高度近视有晶状体眼后房屈光晶状体植入术后拱高的影响因素分析

目的：探讨超高度近视有晶状体眼后房屈光晶状体植入术后拱高的影响因素。

方法：回顾性病例研究。选取2019-01/2021-01于我院行PC-PRL植入术的超高度近视患者40例77眼。术后随访至少2a，评估裸眼视力(UCVA)、最佳矫正视力(BCVA)和中央前房深度(ACD)、前房容积(ACV)、前房角(ACA)、晶状体厚度及术后拱高等眼前节参数，分析术后拱高的影响因素。

结果：PC-PRL植入术后纳入患者UCVA和BCVA均较术前显著改善(P<0.001)，术后2a平均安全指数(术后BCVA/术前BCVA)为1.36±0.32，平均有效指数(术后UCVA/术前BCVA)为1.23±0.31。术后2a拱高与术前ACD、术前ACV、术前ACA及晶状体厚度均具有一定的相关性，其中术前ACV和晶状体厚度对术后2a拱高具有显著影响。

结论：超高度近视PC-PRL植入术安全有效，可显著改善视力，术前ACV和晶状体厚度是影响术后拱高的重要因素。     

Ten-year follow-up of epikeratophakia for the correction of high myopia

OBJECTIVE: To determine the long-term functional results of epikeratophakia for myopic patients. DESIGN: Retrospective, noncomparative, interventional case series. PARTICIPANTS: Twenty-two patients (32 eyes; average age, 43+/-6 years) who underwent epikeratophakia surgery for high myopia. Mean preoperative myopia was -18.74+/-9.16 diopters (D; range, -7 D to -49 D). Follow-up was 12+/-2 years. MAIN OUTCOME MEASURES: Uncorrected visual acuity (UCVA), best-corrected visual acuity (BCVA), change in mean keratometry, visual acuity under glare conditions, BCVA versus potential acuity meter reading, and patient satisfaction with the visual outcome. RESULTS: Mean preoperative UCVA increased from 20/800+/-20/400 (range, counting fingers-20/400) to 20/80+/-20/200 (range, 20/250-20/32) in 24 eyes. Mean preoperative BCVA of 20/32+/-20/64 increased only in five eyes, whereas six eyes had no change and 18 eyes had a more than one line loss of Snellen BCVA. Mean preoperative keratometry reading decreased from 43.67+/-0.90 D (range, 41.0-46.25 D) to 37.40+/-2.92 D (range, 29.43-47.68 D). In the presence of glare, mean BCVA decreased to 20/100+/-20/100 (range, counting fingers-20/32). Potential acuity meter (PAM) readings were significantly (P<0.05) higher than BCVA. Mean PAM reading was 20/25+/-20/100 (range, 20/100-20/16). Seven patients (11 eyes) were extremely satisfied with the operative result more than 10 years after the operation, whereas four patients (four eyes) were not satisfied at all. CONCLUSIONS: Epikeratophakia for the correction of myopia improved UCVA significantly, but BCVA decreased. The removal of the lenticules in patients who were not satisfied with their visual acuity was uncomplicated, and acceptable vision could be achieved with either contact lenses or intraocular lens implantation.     

Intrastromal corneal ring implantation for the correction of myopia: 12-month follow-up

PURPOSE: To evaluate the efficacy, predictability, and stability of refraction obtained after intrastromal corneal ring segment (ICRS) implantation for low to moderate myopia. SETTING: Single-center clinical practice. METHODS: In this prospective 2-surgeon study, 9 patients (15 eyes) with low to moderate myopia were recruited to receive ICRS implants. RESULTS: At 1 day, 10 of the 15 eyes had an uncorrected visual acuity (UCVA) of 20/40 or better. At 12 months, all eyes had this UCVA and 66.6% had 20/25 or better. The mean manifest refraction stabilized after the first week at <-0.5 diopter (D). At 12 months, all eyes were within +/-1.0 D of the intended manifest refraction; 67% were within +/-0.5 D. Sixty percent of eyes had no change from the preoperative best corrected visual acuity; 13.3% improved by 1 line, and 26.6% lost 1 line. The postoperative complications included lamellar channel deposits (n = 12), ICRS dislocation (n = 2), corneal infiltrates (n = 2), bleeding in the positioning ring hole (n = 1), 0.3 mm segment decentration (n = 1), and prolonged wound healing (n = 1). CONCLUSIONS: Intrastromal corneal ring segment implantation for the correction of low to moderate myopia afforded good visual recovery and efficacy similar to that with laser in situ keratomileusis and superior to that with photorefractive keratectomy. However, light or blunt trauma and insufficient hygiene can have serious consequences and there is the potential for induced astigmatism. Corneal infiltrates can occur and must be treated immediately. The ring implantation technique is demanding. Advantages of ICRS implantation include rapid and stable visual recovery as well as reversibility.     

新型中央孔型ICL V4c植入术治疗高度近视

目的：观察高度近视患者植入新型中央孔型ICL V4c术后中长期疗效及安全性。

方法：选取2016-01/2017-06在我院接受新型中央孔型ICL V4c植入术的高度近视患者58例116眼,术后1wk,1mo,1a进行随访,观察UCVA、BCVA、等效球镜、眼压、角膜内皮细胞计数、拱高、术后不良反应及并发症。

结果：术后UCVA和BCVA较术前提高(P<0.01),术后1mo与术后1a无差异(P>0.05),其余术后各时间点两两比较均有差异(P<0.05)。术后SE较术前降低(P<0.01),虽各时间点两两比较均有差异(P<0.01),但术后1mo与术后1a等效球镜几乎接近0D。术后1a手术安全指数为1.33±0.67,手术有效性为1.32±0.69。术后各时间点与术前眼压无差异(P>0.05)。术后1a角膜内皮细胞密度与术前无差异(P>0.05)。所有研究对象均未见白内障、青光眼、角膜内皮失代偿等。术后满意度为100%。

结论：新型中央孔型ICL V4c植入术是治疗高度近视安全而有效的方法,术后1mo视力稳定。     

ICL植入术矫正超高度近视的临床效果观察

目的:评估有晶状体眼后房型人工晶状体(ICL)矫正超高度近视的疗效及安全性。方法:对超高度近视患者20例40眼接受普通型ICL或散光型后房型人工晶状体(TICL)治疗,术前屈光度球镜-10.0～-18.0D,柱镜-0.25～-3.00D,等效球镜-15.32D,术后随访12mo,观察指标包括UCVA,BCVA、角膜地形图、主观和客观验光、角膜内皮细胞计数、眼压测量、裂隙灯检查。结果:术后12mo,裸眼视力≥0.8者占80.0%(32眼)。30.0%(12眼)的术眼BCVA较术前提高1行,15.0%(6眼)的术眼BCVA较术前提高2行。术后12mo术眼屈光度在±0.50D者达70.0%(28眼)。术前患者平均眼压为16±2.8mmHg,术后6mo平均眼压为17±3.4mmHg,术前术后相比较差异无显著性(t=0.518,P=0.776),术前患者角膜内皮细胞计数平均为2823±243.6个/mm2,术后6mo平均为2709±273.2个/mm2,术前术后比较无显著性差异(t=0.794,P=0.422)。未发生继发性青光眼、视网膜脱离及并发性白内障。结论:ICL植入术矫正超高度近视具有良好的疗效和安全性,远期效果有待进一步观察。     

Long-term outcomes of wedge resection at the limbus for high irregular corneal astigmatism after repaired corneal laceration

AIM: To evaluate the clinical value of wedge resection at corneal limbus in patients with traumatic corneal scarring and high irregular astigmatism. METHODS: Patients with traumatic corneal astigmatism received wedge resection at least 6mo after suture removal from corneal wound. The uncorrected distance visual acuities (UCVA) and best corrected distance visual acuities (BCVA), pre- and post-operation astigmatism, spherical equivalent (SE), safety and complications were evaluated. RESULTS: Ten eyes (10 patients) were enrolled in this study. Mean follow-up time after wedge resection was 37.8±15.4mo (range, 20-61mo). The mean UCVA improved from +1.07±0.55 logMAR to +0.43±0.22 logMAR (P=0.000) and the mean BCVA from +0.50±0.30 logMAR to +0.15±0.17 logMAR (P=0.000). The mean astigmatism power measured by retinoscopy was -2.03±2.27 D postoperatively and -2.83±4.52 D preoperatively (P=0.310). The mean SE was -0.74±1.61 D postoperatively and -0.64±1.89 D preoperatively (P=0.601). Two cases developed mild pannus near the sutures. No corneal perforation, infectious keratitis or wound gape occurred. CONCLUSION: Corneal-scleral limbal wedge resection with compression suture is a safe, effective treatment for poor patients with high irregular corneal astigmatism after corneal-scleral penetrating injury. Retinoscopy can prove particularly useful for high irregular corneal astigmatism when other measurements are not amenable.     

Evaluation of anterior chamber inflammation after corneal refractive surgery.

PURPOSE: To prospectively evaluate inflammatory response by measuring aqueous flare in the anterior chamber after photorefractive keratectomy (PRK), laser in situ keratomileusis (LASIK), and intracorneal ring segments (ICRS) implantation. METHODS: Aqueous flare was measured pre- and postoperatively at days 1, 7, and 21 with a laser flare meter (Kowa FM 500). Thirty-one patients (58 eyes) were randomized, only for low myopia, in three groups treated with PRK (myopia <-4.50 D), LASIK (myopia range between -4.00 and -12.00 D), and ICRS (myopia <-4.50 D). RESULTS: Mean preoperative flare intensities were similar in the three groups (p< or =0.05; mean, 4.6 photons/ms). In the PRK group, flare increased significantly (mean day 2, 9.5 photons/ms), as it did in the LASIK group (mean day 1, 23.8 photons/ms). In the ICRS group, there was no significant difference between pre- and postoperative levels of flare at any time (mean day 1, 4.9 photons/ms). In all three groups, flare intensity returned to baseline at day 7, except in the LASIK group, which remained at a significantly higher level (mean day 7, 7.7 photons/ms) than the preoperative one. CONCLUSIONS: According to this method, the blood-aqueous barrier seems to be altered in laser procedures, particularly in LASIK, probably in correlation with the depth of photoablation. ICRS implantation did not increase the postoperative flare significantly.     

Toric人工晶状体植入矫正老年性白内障合并角膜散光的疗效

目的：探讨老年性白内障合并角膜散光行超声乳化摘除联合Toric人工晶状体植入的临床效果,比较Acrysof Toric人工晶状体植入前后的视觉质量。

方法：选择老年性白内障合并角膜散光的患者34例为研究对象,进行白内障超声乳化摘除联合Toric人工晶状体植入,观察术前和术后3mo的临床效果,包括裸眼视力(UCVA),最佳矫正视力(BCVA),全眼残余散光,人工晶状体转动度数,视远脱镜情况。

结果：所有患者Toric人工晶状体均成功植入。术前UCVA 0.15±0.06,术后UCVA上升至0.65±0.15(P<0.01); 术前BCVA 0.37±0.13,术后BCVA上升至0.85±0.19(P<0.01); 全眼散光由术前2.14±0.69D降低至0.73±0.36D(P<0.01),97%的患者人工晶状体转位<5°,平均旋转2.6°±1.3°,术后3mo视远脱镜率达95%。

结论：Toric人工晶状体能够有效矫正白内障合并的角膜散光,晶状体在囊袋内具有良好的稳定性,提高了患者的术后视觉质量。