scholarly journals Comparison of early changes in and factors affecting vault following posterior chamber phakic Implantable Collamer Lens implantation without and with a central hole (ICL V4 and ICL V4c)

2016 ◽  
Vol 16 (1) ◽  
Author(s):  
Xun Chen ◽  
Huamao Miao ◽  
Rajeev Krishnan Naidu ◽  
Xiaoying Wang ◽  
Xingtao Zhou
Keyword(s):  
Central Hole ◽  
Posterior Chamber ◽  
Implantable Collamer Lens ◽  
Factors Affecting ◽  
Lens Implantation ◽  
Icl V4c

​Short-term changes in and preoperative factors affecting vaulting after posterior chamber phakic Implantable Collamer Lens implantation

2020 ◽  
Author(s):  
Qiujian Zhu ◽  
Wen-Jing Chen ◽  
Wei-Jian Zhu ◽  
Hai-Xiang Xiao ◽  
Man-Hui Zhu ◽  
...  
Keyword(s):  
Multiple Regression ◽  
Corneal Thickness ◽  
Anterior Chamber Depth ◽  
Crystalline Lens ◽  
Stepwise Multiple Regression ◽  
Multiple Regression Equation ◽  
Posterior Chamber ◽  
Key Factors ◽  
Implantable Collamer Lens ◽  
Factors Affecting

Abstract Background: To describe the very early changes in vault in the first month after Implantable Collamer Lens (ICL) implantation and to evaluate the effect of preoperative biometric factors on vault.Methods: A total of 83 eyes from 83 subjects with complete data who met follow-up requirements were recruited in this retrospective study between May 2019 and March 2020. We quantitatively assessed postoperative vault at 2 hours, 1 day, 1 week, and 1 month following implantation. Associations between postoperative vault and age, ICL size, spherical equivalent (SE), axial length (AL), central corneal thickness (CCT), flat K, steep K, mean K, anterior chamber depth (ACD), crystalline lens thickness (LT), white-to-white (WTW) diameter obtained by three devices, horizontal and vertical sulcus-to-sulcus (STS) diameter, bright and dark pupil sizes (BPS and DPS) and DPS-BPS were investigated using Spearman’s correlation analysis and stepwise multiple regression analysis.Results: The mean vault values at 2 hours, 1 day, 1 week, and 1 month after ICL implantation were 672.05 ± 30.72, 389.15 ± 28.33, 517.23 ± 30.76 and 530.12 ± 30.22 μm, respectively. There were significant differences in vault values between 2 hours, 1 day and 1 week after the operation. ICL size (β = 0.942; p < 0.001), followed by horizontal STS (β = -0.517; p < 0.001), crystalline LT (β = -0.376; p < 0.001) and vertical STS (β = -0.257; p = 0.017), significantly influenced vault at 1 month after the operation. The multiple regression equation was expressed as follows: central vault (μm) = -1369.05+ 657.121 × ICL size- 287.408 × horizontal STS - 432.497 × crystalline LT - 137.33 × vertical STS (adjusted R2 = 0.643).Conclusions: After ICL implantation, vault decreased and then increased, but it did not return to the vault value at 2 hours after surgery. ICL size, horizontal and vertical STS and crystalline LT were key factors for predicting postoperative vaulting.

Combined Corneal Collagen Cross-Linking and Posterior Chamber Toric Implantable Collamer Lens Implantation for Keratoconus

2011 ◽  
Vol 42 ◽  
pp. e22-e25 ◽  
Author(s):  
George D Kymionis ◽  
Michael A Grentzelos ◽  
Alexandra E Karavitaki ◽  
Zotta Paraskevi ◽  
Sonia H Yoo ◽  
...  
Keyword(s):  
Cross Linking ◽  
Posterior Chamber ◽  
Implantable Collamer Lens ◽  
Lens Implantation ◽  
Collagen Cross Linking ◽  
Corneal Collagen

scholarly journals Posterior-Chamber Phakic Intraocular Lens Implantation in Patients over 40 Years of Age

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Pedro Tañá-Rivero ◽  
Francisco Pastor-Pascual ◽  
Marceliano Crespo ◽  
José L. Rodríguez-Prats ◽  
José J. Muñoz-Tomás ◽  
...  
Keyword(s):  
Crystalline Lens ◽  
Posterior Chamber ◽  
Spherical Equivalent ◽  
Efficacy And Safety ◽  
Phakic Intraocular Lens ◽  
Implantable Collamer Lens ◽  
Lens Implantation ◽  
Over 40 Years ◽  
Myopic Astigmatism

Purpose. To assess the efficacy, safety, and predictability of the Visian Implantable Collamer Lens (ICL) model having a central port in patients over 40 years of age. Methods. This study included 33 eyes from 21 patients who underwent V4c ICL implantation for the correction of myopia and myopic astigmatism. We assessed uncorrected (UDVA) and corrected (CDVA) distance visual acuity, refraction, intraocular pressure (IOP), endothelial cell density (ECD), vault, and adverse events occurring over a 1-year period. Results. Mean age of the patients at the time of implantation was 43.52 ± 4.49 years (range: 40 to 56 years). Efficacy and safety indexes were 1 and 1.09, respectively. Surgical outcomes for CDVA were as follows: no eye lost any lines, 19 eyes (57.58%) showed no CDVA changes, 7 eyes (21.21%) gained 1 line, 4 eyes (12.12%) gained 2 lines, and 3 eyes (9.09%) gained ≥3 lines. Mean postoperative spherical equivalent (SE) was −0.09 ± 0.47 D. A total of 29 eyes (87.8%) were within ±0.50 D and 31 eyes (93.9%) were within ±1.00 D of the desired SE. At 1-year, mean IOP was 15.27 ± 3.03 mmHg (range: 9 to 20 mmHg, p=0.12 pre vs. post) and mean ECD was 2516 ± 234 cells/mm2 (p=0.29 pre vs. post). Mean postoperative vault was 320 ± 136 μm, with 201–300 μm being the most prevalent vault range for 9 eyes (31.03%). None of the eyes showed a vault >701 μm. There were neither intraoperative nor postoperative complications; in fact, all ICL implantation procedures were uneventful. Conclusions. Our study’s findings support the use of this lens in patients over 40 years of age. A long follow-up period is advisable to monitor ICL position relative to the crystalline lens.

Influence of refractive error on pupil diameters in highly myopic eyes with implantable collamer lenses

2019 ◽  
Vol 30 (6) ◽  
pp. 1328-1334
Author(s):  
Yi Zhu ◽  
Yu Yue ◽  
Haobin Zhu ◽  
Jili Chen ◽  
Jibo Zhou
Keyword(s):  
Refractive Error ◽  
High Myopia ◽  
Pupil Diameter ◽  
Spherical Equivalent ◽  
Implantable Collamer Lens ◽  
Lighting Conditions ◽  
Lens Implantation ◽  
Group A ◽  
Icl V4c ◽  
Percent Decrease

Purpose: To investigate the influence of refractive error on pupil diameters in highly myopic eyes with implantable collamer lenses. Setting: Shanghai, China. Design: A prospective consecutive observational study. Methods: Sixty-six eyes of 66 patients that underwent ICL V4c implantation were included. Pupil diameters before and 1 week, 1 month, and 3 months after surgery were measured using an automatic pupillometry system (MonCv3; Metrovision, Pérenchies, France) under four standardized illumination conditions: 0, 1, 10, and 100 cd/m2. The correlations between changes in pupil diameter and spherical equivalent values and patient age were investigated. Results: Based on preoperative spherical equivalent values, included eyes were divided into a high-myopia group (–6.3 to −9.9 D (diopters)) and a super-high-myopia group (–10 to −20 D). Pupil sizes remained unchanged after surgery in the high-myopia group and decreased at 1 and 10 cd/m2 in the super-high-myopia group. A between-group comparison showed that pupils were significantly smaller in the super-high-myopia group 1 week postoperatively under all illumination conditions and remained smaller at 1 month and 3 months under 1 and 10 cd/m2 lighting conditions. Preoperative spherical equivalent values were significantly correlated with the percent decrease in pupil diameter 1 week postoperatively under 0, 1, and 10 cd/m2 illumination conditions; the greater the degree of myopia, the greater the reduction in pupil diameter. Conclusion: Preoperative refractive error significantly affects pupil diameter in highly myopic eyes after implantable collamer lens implantation. Pupils of super highly myopic eyes remained smaller than preoperative levels under mesopic conditions after implantable collamer lens implantation.

scholarly journals Evaluation of Disk Halo Size after Implantation of a Collamer Lens with a Central Hole (ICL V4c)

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Xun Chen ◽  
Tian Han ◽  
Feng Zhao ◽  
Huamao Miao ◽  
Xiaoying Wang ◽  
...  
Keyword(s):  
Light Response ◽  
Pupillary Response ◽  
Central Hole ◽  
Implantable Collamer Lens ◽  
Contraction Amplitude ◽  
Pupillary Light ◽  
Significant Difference ◽  
Icl V4c ◽  
Latency Duration ◽  
Average Pupil

Purpose. To investigate disk halo size changes produced by a glare source after surgical insertion of an implantable collamer lens with a central hole (ICL V4c) for myopia correction. Methods. In this prospective study, disk halo size and pupillary light response with a vision monitor were measured preoperatively and at 1 week, 1 month, and 3 months postoperatively. Pupillary light response parameters included contraction amplitude, latency, duration, and velocity; dilation latency, duration, and velocity; and initial, maximum, minimum, and average pupil diameters. Results. Forty-two right eyes of 42 patients were enrolled. Postoperative uncorrected distance visual acuity was better than or equal to 20/20 in all eyes. Compared to preoperative values, disk halo size showed no significant difference at 1 week postoperatively (P>0.05) and then decreased significantly at 1 and 3 months postoperatively (both P<0.001). Contraction amplitude and velocity, as well as dilation velocity, decreased significantly at all postoperative time points (all P<0.001). Disk halo size at 3 months postoperatively was significantly correlated with initial (r = 0.446, P=0.003), maximum (r = 0.483, P=0.001), minimum (r = 0.425, P=0.005), and average pupil diameters (r = 0.474, P=0.002). Conclusions. After ICL V4c implantation, disk halo size was reduced in the short term. Patients with smaller pupil sizes during pupillary response to light experienced smaller halos after ICL V4c implantation.

scholarly journals Phakic Posterior Chamber Intraocular Lens with a Central Hole in Treating Patients with Moderate to High Myopia: A Meta-Analysis

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Ying Tang ◽  
Jian Ye
Keyword(s):  
Randomized Controlled Trials ◽  
Intraocular Lens ◽  
High Myopia ◽  
Meta Analysis ◽  
Central Hole ◽  
Posterior Chamber ◽  
Controlled Trials ◽  
Randomized Controlled ◽  
Posterior Chamber Intraocular Lens ◽  
Icl V4c

Purpose. To evaluate the efficacy of phakic posterior chamber intraocular lens with a central hole (ICL V4c) in treating patients with moderate to high myopia. Methods. PubMed, Embase, Cochrane Library, Clinical Trial, China Biomedical Literature Database (CBM), China National Knowledge Infrastructure (CNKI), and China Science Periodical Database (CSPD) were searched online. The search included publications from the building of the library until December 2018. All randomized controlled trials containing moderate to high myopia treated by phakic posterior chamber intraocular lens with a central hole were collected. Literature search, screening literature, data extraction, and quality evaluation were independently performed by two reviewers. Meta-analysis was performed using RevMan 5.3 software. Results. Meta-analysis results based on five randomized controlled trials showed that ICL V4c and ICL without a central hole had similar UCVA results (SMD = 0.08, 95% CI (−0.71, 0.88), P=0.84), SE (SMD = −0.18, 95% CI (−0.52, 0.15), P=0.29), BCVA (SMD = −0.27, 95% CI (−0.93, 0.40), P=0.43), and IOP (SMD = 0.03, 95% CI (−0.24, 0.30), P=0.84), and the difference was not statistically significant. In addition, no complications that could jeopardize vision occurred. Conclusions. Implanting ICL V4c in patients with moderate to high myopia is safe and effective.

Factors Affecting Vaulting After Implantable Collamer Lens Implantation

2009 ◽  
Vol 25 (3) ◽  
pp. 259-264 ◽  
Author(s):  
Kazutaka Kamiya ◽  
Mari Komatsu ◽  
Kimiya Shimizu
Keyword(s):  
Implantable Collamer Lens ◽  
Factors Affecting ◽  
Lens Implantation

scholarly journals Optical Quality after Posterior Chamber Phakic Implantation of an Intraocular Lens with a Central Hole (V4c Implantable Collamer Lens) under Different Lighting Conditions

2019 ◽  
Author(s):  
Tianrui He ◽  
Yi Zhu ◽  
Jibo Zhou
Keyword(s):  
Intraocular Lens ◽  
High Myopia ◽  
Optical Quality ◽  
Central Hole ◽  
Posterior Chamber ◽  
Optical Parameters ◽  
Implantable Collamer Lens ◽  
Lighting Conditions ◽  
Significant Difference ◽  
Dark Conditions

Abstract Background The current study compared optical quality before and after implantation of a posterior chamber phakic intraocular lens with a central hole [V4c implantable collamer lens (ICL)] under bright and dark lighting conditions by means of the Optical Quality Analysis System™ (OQAS; Visiometrics, Terrassa, Spain). Methods This prospective study involved 91 eyes of 46 consecutive patients undergoing implantation of a V4c ICL (15 males and 31 females). The modulation transfer function (MTF) cutoff frequency, Strehl ratio, objective scattering index (OSI), and predicted visual acuities (PVAs; 100%, 20%, and 9%), under different lighting conditions, were measured before and 1 week, 1 month, and 3 months after surgery. Results All optical parameters showed significant improvements, at all time points, under dark condition after surgery. We observed no significant changes in PVA 9% at 1 week (P=0.12) or 1 month after surgery (P=0.08) under light condition; but all other postoperative parameters improved significantly. Comparing the two lighting conditions, the OSI decreased more under dark conditions at 1 week (P=0.02), 1 month (P=0.004), and 3 months (P=0.002), but there was no significant difference in any other parameter. In addition, patients were divided into a high myopia group (group H) and a super-high myopia group (group S), the group S improved significantly more than group H in all parameters, under both bright and dark conditions. Conclusions V4c ICL implantation improved optical quality under both bright and dark lighting conditions, and had a better ability to reduce the extent of scattering in the dark. Furthermore, group S achieved greater improvement in visual quality, which should be considered by physicians before surgery.

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