圆锥角膜患者使用Rose K2软性角膜接触镜的临床表现

目的:评价圆锥角膜患者使用Rose K2软性角膜接触镜的舒适度及视觉表现.方法:横断面研究.50例患者(50眼)接受全面的眼科检查,包括屈光度、裸眼视力(UCVA)、最佳矫正视力(BCVA)、裂隙灯显微镜及眼底检查、泪膜破裂时间(BUT)、角膜地形图和对比敏感度.戴镜后,测量最佳戴镜矫正视力(BCLCVA)、对比敏感度及舒适度通过平均视觉模拟量(VAS)呈现.结果:患者平均年龄为26.2依6.0 (16 ~39) y.使用Rose K2软性角膜接触镜 UCVA,BCVA,和 BCLCVA 的平均logMAR值依次为0.61依0.37 (0.15 ~1.3),0.42依0.32 (0~1.3) 和0.18依0.20 (0 ~1.3).使用接触镜后视敏度显著提高(P<0.05),在明视和暗视条件下,对比敏感度数值明显增加(P<0.05).Rose K2软性角膜接触镜的视觉模拟量(VAS)值为8.02依1.64(5~10).结论:圆锥角膜患者使用Rose K2软性角膜接触镜能够改善视力,对比敏感度以及舒适度.     

透气硬性角膜接触镜在角膜屈光手术后的应用

目的 观察透气硬性角膜接触镜(Rigid Gas-permeableContactlenses,RGP)在角膜屈光手术后矫正视力、改善视觉症状的效果.方法 眼科视光门诊中做过近视性角膜屈光手术的患者7例1 1只眼,经常规检查后,予验配多种设计的RGP,记录戴镜前的裸眼视力、框架镜最佳矫正视力和戴RGP的最佳矫正视力.记录部分患者戴RGP前后的波前像差.随访过程中记录配戴情况及并发症.结果 该组患者需要三种设计的RGP镜片:圆锥角膜RGP、逆几何RGP和大直径非球面RGP.戴RGP前裸眼视力在0.03～0.4者7只眼,0.8～1.0者4只眼.戴RGP前的框架镜最佳矫正视力在0.2～0.5者5只眼,0.7～1.0者6只眼.戴RGP的最佳矫正视力在0.7～0.9者4只眼,1.0者7只眼.配戴RGP后的球差、彗差和三叶草差分别较配戴前降低88.7%、92.9%和18.9%.全部患者的视觉症状在配戴RGP后均改善.角膜上皮染色是最常见的并发症,主要是圆锥角膜的锥顶部上皮磨损染色.平均随访21.5月,全部患者能够坚持日间配戴.结论 角膜屈光手术后配戴特殊设计的RGP可以提高视力,改善视觉质量.未见严重地角膜接触镜相关的并发症.

Abstract：

Objective To evaluate the efficacy of specially designed rigid gas-permeable contact lenses (RGP) in visual correction and visual symptom control after corneal refractive surgery. Methods Eleven eyes of 7 cases after myopic corneal refractive surgery from optometry clinic were fitted with RGP in different designs after routine eye checks. Uncorrected visual acuity (UCVA), best spectacle corrected visual acuity (BSCVA) before RGP fitting and best contact lens corrected visual acuity (BCLCVA) after RGP fitting were recorded. Wave front aberrations of some patients before and after RGP fitting were measured. Fitting state and complications were recorded at follow-ups. Results Three kinds of lens design were applied: keratoconic design, reverse geometry design and aspheric design with larger diameter. BCLCVA was much higher than UCVA and BSCVA. Spherical aberration, coma and trefoil were reduced by 88.7%, 92.9% and 18.9% respectively after RGP fitting. Visual symptoms of all patients after RGP fitting were improved. The main complication was corneal staining of iatrogenic keratoconus. All patients can tolerate wearing RGP in the day time after an average follow-up of 21.5 months. Conclusions Specially designed RGP fitted after corneal refractive surgery can raise the best corrected visual acuity and improve the quality of vision. No serious complications related to RGPwearing are observed.     

Visual rehabilitation and outcomes for ectasia after corneal refractive surgery

PURPOSE: To analyze the visual outcomes and method of final visual correction in eyes with corneal ectasia after laser in situ keratomileusis (LASIK) or photorefractive keratectomy (PRK). SETTING: Emory University Department of Ophthalmology and Emory Vision, Atlanta, Georgia, USA. METHODS: This retrospective review comprised 74 eyes of 45 patients with corneal ectasia after LASIK (72 eyes) or PRK (2 eyes). Outcomes included postoperative uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BSCVA), best corrected visual acuity (BCVA), and refraction; method of final visual correction; and time to rigid gas-permeable (RGP) contact lens failure. RESULTS: Corneal ectasia developed a mean of 19.2 months after surgery. Postoperatively, the mean UCVA was 20/400 and the mean BSCVA before ectasia management was 20/108. After ectasia management, the mean BCVA was 20/37 and the final BCVA was 20/40 or better in 78% of eyes. Final visual correction was achieved with RGP lenses in 77% of eyes, spectacles in 9%, collagen crosslinking in 3%, intracorneal ring segments in 1%, and penetrating keratoplasty (PKP) in 8%. Two eyes with intracorneal ring segments required segment explantation and subsequent PKP. One eye that had PKP had a graft-rejection episode; there were no graft failures. Two eyes (3%) did not require a visual device to improve visual acuity. The mean time for successful RGP lens wear was 24.8 months; 80% of cases initially managed with RGP lenses were successful with this form of treatment. CONCLUSIONS: The majority of eyes developing postoperative corneal ectasia achieved functional visual acuity with RGP lens wear and did not require further intervention. Penetrating keratoplasty can usually be postponed or avoided by alternative methods of visual rehabilitation; however, PKP, when necessary, can provide good visual outcomes.     

Efficacy of custom-made soft keratoconus lenses on corneal aberrations and photic phenomena in patients with keratoconus: a corneal topography imaging based study

AIM: To evaluate the efficacy of custom-made soft keratoconus (KC) lenses on corneal aberrations and photic phenomena in two different optical zones in patients with KC. METHODS: Sixty eyes of 42 patients with KC were examined at baseline and after fitting HydroCone (Toris K) soft silicone hydrogel lenses. Best spectacle-corrected visual acuity (BSCVA) and contact lens-corrected visual acuity (CLCVA) were recorded. Lower- and higher-order corneal aberrations (LOAs and HOAs) were measured with and without Toris K lenses and compared in central 4.5 mm and 7 mm zones. Mesopic pupil diameter and subjective photic phenomena were also assessed. RESULTS: Mean CLCVA was significantly improved compared to BSCVA (P<0.0001). Corneal curvature and refractive measurements were found to be significantly reduced by the use of Toris K lenses, except for posterior corneal curvature values. In the 4.5 mm central optical zone, all wavefront aberrations decreased significantly after lens fitting (P<0.0001). In contrast, in the 7 mm (peripheral) optical zone, values for HOAs, spherical and residual aberrations, and optical path differences were increased, while LOAs, trefoil, and quadrifoil coefficients were decreased. The rate of photic phenomena was significantly higher in participants with a pupil size >6.00 mm (85.7%). CONCLUSION: Toris K lenses provide good visual results and a significant reduction in central corneal aberrations in patients with KC but could cause an increase in peripheral aberrations. This practical and nonsurgical approach appears to be an effective method for the visual management of KC.     

Rose K硬性透气性角膜接触镜矫正完成期圆锥角膜屈光不正临床效果

目的总结Rose K硬性透气性角膜接触镜（Rose K RGPCL）矫正完成期圆锥角膜患者屈光不正的临床效果。方法回顾性病例研究。2011年2月至2012年5月,55例（59眼）完成期圆锥角膜患者在山东省眼科医院接受了Rose K RGPCL验配矫正,用角膜荧光染色法判断戴Rose K RGPCL 静态配适状态。对戴RGPCL前角膜地形图9 mm直径上0°、90°、180°、270° 4个点和锥顶角膜曲率值之间,裸眼视力（UCVA）、最佳眼镜矫正视力（BSCVA）和戴Rose K RGPCL 矫正视力之间,UCAV、BSCAV和戴Rose K RGPCL 3种状态下对比度视力之间,角膜平、陡、平均曲率半径及镜片基弧之间的差异采用方差分析进行比较。结果59眼角膜地形图周边4个点和锥顶角膜曲率两两比较,锥顶与周边4组差异均有统计学意义（P均<0.01）; 相同对比度下UCVA、BSCVA及戴Rose K RGPCL矫正视力两两比较差异均有统计学意义（P均<0.01）;镜片基弧与角膜平K、平均曲率半径两两比较差异均无统计学意义（P＞0.05）。结论完成期圆锥角膜患者验配Rose K RGPCL镜片能达到理想配适状态并获得较好的矫正视力及低对比度视力;验配过程中平坦曲率半径或平均曲率半径可以做为选择试戴片的基础。     

Contact lens wear after photorefractive keratectomy: comparison between rigid gas permeable and soft contact lenses.

PURPOSE: To determine if rigid gas permeable (RGP) or soft contact lenses can be successfully worn after photorefractive keratectomy (PRK) to correct residual refractive errors. METHODS: Patients with residual stable ametropia after PRK were fit with RGP or soft lenses. Manifest refraction, corneal topography, and keratometry were performed, and post-PRK corneal haze was graded during the study visits. Contact lens fit characteristics and comfort were assessed. Lens centration, visual quality, and ocular surface status were graded, and visual acuity with contact lenses was charted. RESULTS: Eighteen patients were recruited for RGP lens fitting. The mean refractive error post-PRK was +0.80 D +/- 2.03 (range: -3.50 to+3.00 D). The mean contact lens power was -3.90 D +/- 2.03 (range: 0 to -7.00 D), and the mean contact lens base curve was 7.88 mm +/-0.16. A significant positive tear film at the site of the central ablation was noted, contributing to excessive minus lens power in all cases. Despite mild to moderate lens instability and de-centration, 14 patients reported excellent visual quality with the lenses, and pre-PRK best-corrected acuity was achieved in all patients. Twenty-five percent (4 of 16) of the patients were able to wear the lenses all day. Eleven patients were recruited for soft contact lens fitting-five from the RGP trial. The mean refractive error post-PRK was -0.64 D +/- 2.01 (range: -3.50 to +1.75D). The mean contact lens power was -0.60 D +/- 2.07 (range: -3.75 to +2.5 D), and the mean contact lens base curve was 8.33 mm +/- 0.42. Eight patients were corrected with lenses to their pre-PRK best-corrected acuity, and nine patients reported excellent visual quality with the lenses. All the patients had excellent lens centration. Thirty-six percent (four of 11) of patients were wearing the lenses all day. CONCLUSIONS: Fitting RGP lenses after PRK results in good visual acuity but may be associated with mild to moderate lens instability and decentration. Soft contact lens fitting also results in good visual acuity. Soft lenses were better tolerated by the subjects in our study because of improved lens centration and stability.     

配戴Orbiflex K®角膜接触镜改善圆锥角膜患者视力的研究

目的：评估圆锥角膜患者配戴Orbiflex K?角膜接触镜在不同疾病阶段的视力康复结果。
　　方法：选取研究对象为2012-11/2013-12在 Dr. Lütfi Kιrdar Kartal培训和研究医院确诊为圆锥角膜的52例患者80眼。所有患者接受硬性角膜接触镜治疗,术后随访12 mo。患者的平均年龄为26.1±6.9岁(范围：15~43岁)。患者依照Amsler-Krumeich分型以及各阶段角膜曲率值进行分组。在配戴角膜接触镜治疗前后进行裸眼视力( UCVA),最佳矫正视力( BCVA),主观验光,角膜形态,角膜曲率,中央角膜厚度和生物显微镜检查。
　　结果：角膜横轴屈光度(K1)平均值为50.25±4.17D,而角膜纵轴屈光度(K2)平均值为53.82±4.81D。 K的平均值为52.03±4.42 D。 UCVA的平均值为1.31±0.21 LogMAR ( Snellen 0.05±0.04),戴眼镜和戴角膜接触镜下BCVA的平均值分别为0.79±0.33 LogMAR(Snellen 0.21±0.17)和0.05±0.08 LogMAR(Snellen 0.91±0.13)。比较角膜接触镜治疗前后的视力结果,差异有统计学意义(P<0.001)。第1,2,3和4阶段圆锥角膜患者视力提高平均行数分别为5.18±1.38(范围：2~8)行,5.86±1.79(范围：2~8)行,6.32±2.16(范围：3~9)行和6.92±2.35(范围：3~9)行。
　　结论：OrbiflexK?角膜接触镜显著地改善了所有阶段的圆锥角膜患者的视力。     

Reverse geometry contact lens fitting after corneal refractive surgery

PURPOSE: To describe reverse geometry rigid gas permeable (RGP) contact lens fitting in eyes with irregular surface induced by complications after myopic corneal refractive surgery. METHODS: Reverse geometry RGP contact lenses were fit in nine eyes that underwent myopic corneal refractive surgery and experienced a reduction in best spectacle-corrected visual acuity (BSCVA) Snellen lines postoperatively. RESULTS: Comparing the BSCVA with contact lenses, 5 (55.6%) eyes improved > or = 2 lines of BSCVA, 2 (22.2%) eyes improved 1 line, and 2 (22.2%) eyes maintained the same BSCVA as the one eye with spectacles (P < .004). No eye lost lines of BSCVA. All patients reported excellent tolerance and subjective visual quality with the contact lenses. The mean time of contact lens wear was 10.44 +/- 0.88 hours per day (95% confidence interval, 9.76 to 11.12). CONCLUSIONS: Reverse geometry RGP contact lens fitting is effective in correcting surgically induced irregular surfaces with improved visual acuity and comfortable wear. These lenses may be the best choice in cases in which surgical retreatment is unfeasible or undesirable.     

Contact lens in keratoconus

Contact lenses are required for the visual improvement in patients with keratoconus. Various contact lens options, such as rigid gas permeable (RGP) lenses, soft and soft toric lenses, piggy back contact lenses (PBCL), hybrid lenses and scleral lenses are availble. This article discusses about selection of a lens depending on the type of keratoconus and the fitting philosophies of various contact lenses including the starting trial lens. A Medline search was carried out for articles in the English language with the keywords keratoconus and various contact lenses such as Rose k lens, RGP lens, hybrid lens, scleral lens and PBCL.     

Effect of age on outcomes in patients with keratoconus treated by Intacs using a femtosecond laser

PURPOSE: To compare the response to Intacs treatment in different age groups of patients with keratoconus. METHODS: One hundred nine eyes with keratoconus treated with Intacs by using femtosecond laser were divided into three groups according to age: group 1, 13 to 19 years old (n = 20); group 2, 20 to 35 years old (n = 75), and group 3, 35 to 56 years old (n = 14). All patients had clear central corneas and were contact lens intolerant. Pre- and postoperative examination data including uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BSCVA), mean refraction spherical equivalent (MRSE), and K-readings were evaluated. Pre- and postoperative corneal topographies were examined. Visual acuities were detected by Snellen chart. Postoperative follow-up was 1 year. RESULTS: The improvement in UCVA, BSCVA, MRSE, and K-readings postoperatively in each group was statistically significant. The pre- and postoperative differences in UCVA (P = .930), BSCVA (P = .470), MRSE (P = .205), and K-readings (P = .545) were similar among groups. CONCLUSIONS: Intacs treatment is safe and effective in all age groups. Therefore, it may be an alternative treatment to penetrating keratoplasty in adolescent patients with keratoconus who are intolerant of contact lenses.     

Contact lens impact on quality of life in keratoconus patients:rigid gas permeable versus soft silicone-hydrogel keratoconus lenses

AIM:To determine the impact of rigid gas permeable (RGP) and silicone-hydrogel keratoconus lenses on the quality of life (QoL) in keratoconus (KCN) patients using the self-reported results from the Contact Lens Impact on Quality of Life (CLIQ) Questionnaire.METHODS:From January 2013 to April 2013, 27 consecutive KCN patients who wore RGP contact lenses (conflexair100 UV KE Zeiss-Wöhlk) or soft silicone-hydrogel contact lenses (SHCLs) for KCN (KeraSoft IC- Bausch&Lomb or Hydrocone Toris K–Swiss lens) completed the CLIQ questionnaire.RESULTS:The mean age of 27 patients was 29.6±8.0y. Fifteen patients were RGP user. The groups were comparable with respect to the mean patient age, sex, and mean K values (P=0.1, P=0.8 and P=0.1, respectively). The mean CLIQperson measure was 42.8±5.5 in RGP group and 39.6±5.5 in SHCLs for KCN group (P=0.06). CLIQperson measure was positively correlated with steep K value (r=0.301, P=0.04). When eyes were stratified by visual acuity with contact lenses, the mean CLIQperson measure was 42.01±5.6 in eyes with a visual acuity of 20/20-20/25 (n=44) and 38.4±5.26 in eyes with a visual acuity of 20/32 or less (n=10; P=0.097).CONCLUSION:RGP lenses and SHCLs for KCN have similar impact on QoL.     

Bevel toric multicurve rigid gas-permeable lens for keratoconus

Purpose

To evaluate the efficacy and safety of Twinbel bevel toric, a newly designed rigid gas-permeable (RGP) lens with a toric bevel curvature, for keratoconus.

Methods

A retrospective analysis of nine eyes of patients with keratoconus who had been wearing RGP contact lenses and were switched to Twinbel bevel toric at Yamaguchi University Hospital. Visual acuity and contrast sensitivity were measured under photopic conditions. Complaint symptoms were recorded as primary outcome measures at follow-up visits. Efficacy and safety were evaluated at 12 weeks after the switch to Twinbel bevel toric or later.

Results

Five eyes (55.6 %) showed an improvement in visual acuity with Twinbel bevel toric compared with the previous lens, whereas four eyes (44.4 %) maintained the same visual acuity as before. The mean best corrected visual acuity ± SD with Twinbel bevel toric was 0.01 ± 0.40 logMAR, significantly better (P = 0.044, paired Student’s t test) than that (0.23 ± 0.51 logMAR) with the previous lens. Contrast sensitivity and subjective complaint scores did not differ significantly between Twinbel bevel toric and the previous lens. No serious complications of Twinbel bevel toric wear were observed.

Conclusions

Fitting of Twinbel bevel toric improved visual acuity in eyes affected by keratoconus, thus providing a viable alternative for management of such eyes.     

应用亲水性软性角膜接触镜处理LASIK术后不良角膜瓣的临床观察

目的 观察和探讨亲水性软性角膜接触镜在LASIK术后处理不良角膜瓣的效果以及对术后视力的影响.方法 采用回顾性研究,共64只眼(33例),其中LASIK术后配戴亲水性角膜接触镜的患者19只眼作为戴镜组;另外随机选择同一时期LASIK术中未配戴角膜接触镜的患者45只眼为非戴镜组作为对照.对两组患者术前、术后裸眼视力(UCVA)、屈光度、角膜散光值,及术后角膜水肿、异物感等参数进行对比统计分析.结果 非戴镜组45只眼中发生角膜瓣裙边5只眼.异物感13只眼,角膜水肿仅2只眼,而戴镜组19只眼中无角膜瓣裙边发生,异物感也仅1只眼,但角膜水肿有10只眼.戴镜组术前BCVA1.30±0.14,术后1d平均UCVA为1.08±0.39,1个月后为1.15±0.27,3个月后为1.24±0.28,术后视力逐渐增加,3个月后达到术前BCVA的水平.非戴镜组术前BCVA1.31±0.18,术后1dUCVA1.34±0.19,1个月后1.23±0.21,3个月为1.27±0.20,视力变化不大.两组术后视力比较,术后1d,戴镜组较差(P=0.002),但3个月后视力差异无统计学意义(P＞0.05),并接近术前BCVA.结论 配戴亲水性角膜接触镜对处理LASIK术中出现薄的、蒂小等不良角膜瓣能起到固定和保护的作用,是一种安全有效的方法.虽然对术后早期的视力有影响,但均能在3个月内逐渐恢复到最佳矫正视力或以上.     

巩膜镜矫正圆锥角膜的临床效果观察

目的：探讨临床上巩膜镜治疗圆锥角膜的有效性。方法：回顾性研究。选择2020 年10 月至2021 年3月于南京医科大学眼科医院验配巩膜镜的圆锥角膜患者18例（26眼）。根据圆锥角膜AmeslerKrumeich分级,I级9眼,II级3眼,III级4眼,IV级10眼。所有患者均经规范验配程序试戴硬性透气 性接触镜（RGPCL）,因RGPCL不耐受、RGPCL适配不佳等原因选择验配巩膜镜。所有患者均进行 视力、屈光度、裂隙灯显微镜、眼底和Pentacam检查等。应用巩膜镜试戴片试戴,分别通过裂隙灯 显微镜观察、荧光素染色及眼前节光学相干断层扫描（OCT）进行适配评估。评估镜片与中央角膜和 周边间隙,以及周边着陆区匹配情况,并评估戴镜后的最佳矫正视力（BCVA）及主观舒适度。采用 Friedman检验进行统计学分析。结果：所有圆锥角膜患者初戴巩膜镜时,裂隙灯显微镜观察示巩膜 镜定位良好。通过前节OCT观察初始角膜中央间隙为（212±58）μm;配戴巩膜镜4 h后,角膜中央间隙为 （164±58）μm,鼻侧为（101±38）μm,下方为（224±135）μm,颞侧为（103±72）μm,上方为（89±45）μm, 镜片边缘结膜血管未见异常。裸眼视力（UCVA）、框架眼镜BCVA、RGPCL配戴后BCVA及巩膜镜 配戴后BCVA（LogMAR）分别为1.35（1.00, 2.00）、0.52（0.22, 0.79）、0.15（0, 0.30）、0.10（0, 0.22）, 各视力差异有统计学意义（χ2 =67.11, P<0.001）。巩膜镜配戴后BCVA较UCVA、框架眼镜BCVA明显 改善,差异有统计学意义（χ2 =59.90, P<0.001; χ2 =31.08, P=0.001）;巩膜镜配戴后BCVA与RGPCL配 戴后BCVA差异无统计学意义（P=1.000）。配戴巩膜镜4 h后,22眼（22/26）主诉戴镜后舒适或非常舒 适;24眼（24/26）主诉戴镜视物良好或非常良好。结论：圆锥角膜配戴巩膜镜定位良好,舒适度也良 好,通过配戴巩膜镜可有效提升矫正视力。巩膜镜是圆锥角膜患者一种有效的治疗方式。     

Rose K contact lens fitting for keratoconus

Purpose We evaluated the clinical outcome and fitting characteristics with Rose K contact lenses in patients with irregular astigmatism due to keratoconus. Methods About 19 patients with keratoconus were fitted with Rose K lens in the Cornea Department at the Fatih Sultan Mehmet Training and Research Hospital between May 2005 and April 2006. Patients were between 19 and 32 years of age. All the patients underwent a complete ophthalmic examination and best-corrected visual acuity measurements were taken with glasses at the baseline visit. During biomicroscopic evaluation, position, and centralization of the contact lens and fluorescein staining were noted. Visual acuity, contact lens comfort, and daily contact lens wearing time after fitting were evaluated. Results A total of 96% of the patients tolerated the fitting. The mean daily wearing time was 10.7 h. There was a significant increase in visual acuity with Rose K lens compared with best-corrected spectacle visual acuity. Conclusion Rose K lenses are a viable alternative in the visual rehabilitation of patients with keratoconus. This study has been presented in the XXIV Congress of the ESCRS, September 9–14, 2006 London as a poster.     

Current perspectives in the management of keratoconus with contact lenses

Our aim is to review current and significant articles on contact lens wear in keratoconus patients. A comprehensive literature search of PubMed was performed for the following topics on contact lens wear in keratoconus patients: (1) characteristics of contact lens wearers, (2) safety and efficacy, (3) complications, (4) fitting techniques, (5) contact lens wear after procedures/surgeries, (6) patient satisfaction. A total of 104 studies were finally selected and reviewed. Gas permeable (GP) lens wear provided significantly better vision than glasses. Special cone design lenses had better patient comfort levels though there was no difference in best corrected visual acuity among the GP lenses. Soft lenses showed good efficacy for the treatment of mild-to-moderate keratoconus with newer designs improving visual performance such as customised hydrogel and novel pinhole lenses. Scleral and hybrid lenses provide good visual acuity and comfort for keratoconic patients previously intolerant to RGP lenses. RGP lens wear post-cross linking (CXL) is relatively well-tolerated. Contact lenses may still be required post intrastromal corneal ring procedures and post keratoplasty. Scheimpflug imaging and anterior segment optical coherent tomography (ASOCT) are useful in contact lens fitting. Computerized contact lens fitting techniques could reduce the chair time of lens fitting as well as improve comfort and visual performance. Contact lenses play an important role in the visual rehabilitation of keratoconus patients. New contact lens designs and materials have significantly expanded the available fitting options for keratoconus patients. Imaging technology can be utilized to guide contact lens fitting.Subject terms: Rehabilitation, Rehabilitation, Implants     

角膜塑形镜矫正近视性屈光参差对双眼视功能的影响

目的：观察近视性屈光参差患者配戴角膜塑形镜后双眼视功能的变化。方法：选取40例配戴角膜塑形镜的近视性屈光参差患者,观察配戴前和配戴3 mo 后裸眼视力( uncorrected visual acuity,UCVA)、最佳矫正视力( best corrected visual acuity, BCVA)、屈光参差度、同视机双眼视功能、近立体视功能的变化。结果：配戴前平均UCVA为4.0±0.2,BCVA为4.96±0.2,屈光参差度-4.64±1.52D;配戴3mo后平均UCVA为4.97±0.07,BCVA为4.99±0.1,屈光参差度为0.23±0.12D;配戴3mo后与配戴前比较,差异均有统计学意义(P<0.05)。配戴前拥有同时视者36例、融合功能21例、远立体视功能13例。配戴3 mo后分别为40例、36例、23例。配戴后获得融合功能和远立体视者较配戴前增加,与配戴前比较有统计学差异(P<0.05)。配戴角膜塑形镜前,框架眼镜矫正后近立体视正常者14例,近立体视异常者26例(13例黄斑立体视,7例周边立体视,6例立体盲)。配戴3 mo后近立体视正常者27例,近立体视异常者13例(7例黄斑立体视,3例周边立体视,3例立体盲)。配戴后3 mo的近立体视与配戴前比较,差异有统计学意义(P=0.004)。结论：配戴角膜塑形镜矫正近视性屈光参差3 mo后,不仅裸眼视力得到提高,而且可以改善立体视功能。     

Pediatric keratoconus and iontophoretic corneal crosslinking: refractive and topographic evidence in patients underwent general and topical anesthesia, 18 months of follow-up

To evaluate the efficiency and safety of iontophoretic transepithelial corneal crosslinking in pediatric patients with progressive keratoconus underwent general or topical anesthesia in 18 months follow-up. 13 patients (13 eyes) diagnosed with progressive keratoconus underwent corneal CXL with iontophoresis (I-CXL). Riboflavin solution was administered by iontophoresis for 5 min, and then UV-A irradiation (10 mW/cm) was performed for 9 min. Preoperative and post-operative visits at 1, 6, 12, and 18 months assessed the following parameters: uncorrected visual acuity (UCVA), best-corrected visual acuity (BCVA), slit-lamp biomicroscopy, corneal topography, optical tomography, and pachymetry with Pentacam (Oculus Optikgeräte GmbH, Wetzlar, Germany), endothelial biomicroscopy (Konan Specular Microscope; Konan Medical, Inc., Hyogo, Japan). The paired Student t test was used to compare data during the follow-up. 10 males and 3 females with a mean age of 15.4 ± 1.7 years (range 11–18 years) were included. The results showed a stabilization of the refractive UCVA and BCVA as early as the first post-operative month, with a slight improvement over time. The Kmax remained stable throughout follow-up (p = 0.04). Transepithelial collagen crosslinking by iontophoresis, unlike other transepithelial techniques seems to halt pediatric keratoconus progression over 18 months. This is the second study evaluating CXL with iontophoresis in pediatric patients with progressive keratoconus with 18 months of follow-up using two different ways of anesthesia.     

Intracorneal rings for the correction of pellucid marginal degeneration

We report a case of Intacs(R) (KeraVision) implantation for the correction of pellucid marginal degeneration (PMD). Preoperatively, the patient's uncorrected visual acuity (UCVA) was 0.05, the best spectacle-corrected visual acuity (BSCVA) was 0.1, and the refraction was -2.00 -7.00 x 90 in the right eye. The flattest meridian (K1) measured 43.8@104 and the steepest meridian (K2), 51.3@14. Ultrasound pachymetry revealed a thin cornea of 420 micrometers. One month postoperatively, the UCVA was 0.2, the BSCVA was 0.5, and the refraction was -8.00 -7.00 x 50. Contact lens best corrected visual acuity was 0.9; 6 months postoperatively, it improved to 1.0. The use of Intacs to treat PMD seems to be viable and improves visual acuity. The residual error can be corrected with contact lenses.     

Intacs for the correction of keratoconus: two-year follow-up

PURPOSE: To evaluate the long-term safety and efficacy of Intacs segments (Addition Technology, Inc.) for the treatment of keratoconus in terms of intraoperative and postoperative complications, visual outcome, restoration of contact lens tolerance, and inhibition of disease progression. SETTING: Service d'Ophtalmologie, CHU Pellegrin, Bordeaux, France. METHODS: This prospective, 2-year follow-up study comprised 100 keratoconic eyes with clear central corneas and contact lens intolerance. The best spectacle-corrected visual acuity (BSCVA), uncorrected visual acuity (UCVA), refractive error, keratometry, pachymetry, and slitlamp examination were assessed preoperatively and 1 and 2 years after Intacs implantation. RESULTS: At 2 years, the UCVA and BCVA improved in 80.5% and 68.3% of eyes, respectively (P<.001). The proportion of eyes with a BCVA >or=0.5 (20/40) increased from 22.0% at baseline to 51.2% and 53.7% at 1 year and 2 years, respectively (P<.001). The manifest refraction spherical equivalent improved from a mean of -6.93 diopters (D) +/- 3.91 (SD) preoperatively to -4.01 +/- 3.16 D at 1 year and -3.80 +/- 2.73 D at 2 years (P<.001). The mean keratometry readings decreased from 50.1 +/- 5.6 D preoperatively to 46.4 +/- 5.3 D at 1 year and 46.8 +/- 4.9 D at 2 years (P<.001). Contact lens tolerance was restored in over 80% of cases. Postoperative slitlamp observations revealed no clinically significant issues. The segments were removed from 4 eyes without complications or sequelae. CONCLUSION: Intacs implantation was a safe and efficacious treatment for keratoconus. Significant and sustained improvements in objective visual outcomes were achieved in most cases, with restoration of contact lens tolerance.