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

2020 ◽  
Author(s):  
Tianrui He ◽  
Yi Zhu ◽  
Jibo Zhou
Keyword(s):  
Intraocular Lens ◽  
High Myopia ◽  
Mean Value ◽  
Optical Quality ◽  
Central Hole ◽  
Posterior Chamber ◽  
Spherical Equivalent ◽  
Implantable Collamer Lens ◽  
Lighting Conditions ◽  
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 high myopia patients (15 males and 31 females, average spherical equivalent -10.50±0.33D) undergoing implantation of a V4c ICL. 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 (mean value 0.539, P=0.12) or 1 month after surgery (mean value 0.573, P=0.08) under bright 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 super high myopia (group S, spherical equivalent greater than -10 D) and high myopia (group H, spherical equivalent from -6 D to -10 D), 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.

Anterior segment optical coherence tomography angle and vault analysis after toric and non-toric implantable collamer lens V4c implantation in patients with high myopia

2017 ◽  
Vol 102 (4) ◽  
pp. 544-548 ◽  
Author(s):  
Guillermo Garcia-De la Rosa ◽  
Andrew Olivo-Payne ◽  
Juan Carlos Serna-Ojeda ◽  
Maria Sandra Salazar-Ramos ◽  
Alejandro Lichtinger ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
High Myopia ◽  
Anterior Segment ◽  
Case Series ◽  
Optical Coherence ◽  
Implantable Collamer Lens ◽  
Iridocorneal Angle ◽  
Lighting Conditions ◽  
Icl V4c

ObjectiveTo assess anterior segment changes, including iridocorneal angle and vault, after toric and non-toric implantable collamer lens (ICL) V4c (STAAR Surgical AG) implantation under different lighting conditions.MethodsLongitudinal, prospective, case series. Patients with high myopia (>6 dioptres) underwent toric and non-toric ICL V4c implantation. Optical coherence tomography measurements were taken under different lighting conditions preoperatively and at 1 week and 1, 6 and 12 months of follow-up.ResultsSeventy-six eyes of 42 patients underwent ICL V4c implantation. Mean age was 27.4 years (±5.14 years, range 20 to 39 years). The average iridocorneal angle showed a statistically significant decrease (p<0.05) in all mesopic, scotopic and photopic conditions after 1 week of surgery compared with the preoperative measurements; in mesopic conditions, it decreased 14.1°, in photopic conditions 14.8° and scotopic conditions 13.2°. The angle measurement had a statistically significant change only in mesopic conditions (p=0.01) over the 1-year follow-up. The average vault under mesopic conditions was 0.661±0.21 mm at week 1. The vault measurement change was statistically significant over the 1-year follow-up in mesopic conditions (p=0.01). Refractive results showed a significant improvement in both uncorrected and corrected distance visual acuity (p<0.001).ConclusionThere is a significant reduction in the iridocorneal angle after ICL V4c implantation. Furthermore, there is a change under mesopic conditions in both the iridocorneal angle and vault during long-term follow-up.

scholarly journals Myopia progression from wearing first glasses to adult age: the DREAM Study

2021 ◽  
pp. bjophthalmol-2020-316234
Author(s):  
Jan Roelof Polling ◽  
Caroline Klaver ◽  
Jan Willem Tideman
Keyword(s):  
Retrospective Study ◽  
The Netherlands ◽  
Refractive Error ◽  
High Myopia ◽  
Prognostic Indicator ◽  
Treatment Intensity ◽  
Spherical Equivalent ◽  
Inclusion Criteria ◽  
Myopia Progression ◽  
Adult Age

PurposeData on myopia progression during its entire course are scarce. The aim of this study is to investigate myopia progression in Europeans as a function of age and degree of myopia from first prescription to final refractive error.MethodsThe Drentse Refractive Error and Myopia Study assessed data from a branch of opticians in the Netherlands from 1985 onwards in a retrospective study. First pair of glasses prescribed was defined as a spherical equivalent of refraction (SER) ≤−0.5 D to ≥−3.0 D. Subjects with prescriptions at an interval of at least 1 year were included in the analysis.ResultsA total of 2555 persons (57.3% female) met the inclusion criteria. Those with first prescription before the age of 10 years showed the strongest progression (−0.50 D; IQR: −0.75 to −0.19) and a significantly (p<0.001) more negative median final SER (−4.48 D; IQR: −5.37 to −3.42). All children who developed SER ≤−3 D at 10 years were highly myopic (SER ≤−6D) as adults, children who had SER between −1.5 D and −3 D at 10 years had 46.0% risk of high myopia, and children with SER between −0.5 D and −1.5 D had 32.6% risk of high myopia. Myopia progression diminished with age; all refractive categories stabilised after age 15 years except for SER ≤−5 D who progressed up to −0.25 D annually until age 21 years.ConclusionOur trajectories of the natural course of myopia progression may serve as a guide for myopia management in European children. SER at 10 years is an important prognostic indicator and will help determine treatment intensity.

scholarly journals Evaluation of changes in choroidal thickness after implantable collamer lens surgery in high myopia patients with Graves’ Ophthalmopathy (inactive phase)

2020 ◽  
Author(s):  
Fanglin He ◽  
Yan Liu ◽  
Renbing Jia ◽  
Jing zhang
Keyword(s):  
Visual Acuity ◽  
High Myopia ◽  
Choroidal Thickness ◽  
Control Group ◽  
Safety Index ◽  
Implantable Collamer Lens ◽  
Graves Ophthalmopathy ◽  
Group A ◽  
Efficacy Index ◽  
Group B

Abstract Background To evaluate the safety and effectiveness of the Visian Implantable Collamer Lens (ICL) implantation in high myopic patients with inactive Graves’ ophthalmopathy (GO) by observing the changes of choroidal thickness (CT). Methods Eight patients (16 eyes) with high myopia accompanied with inactive GO were selected as the experimental group (group A) and 18 high myopic patients (36 eyes) without GO were selected as a control group (group B). The outcomes of uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity (BCVA), safety index, efficacy index, intraocular pressure (IOP), vault, corneal endothelial count, and choroidal thickness (CT) were observed. The values of CT were measured using swept-source optical coherence tomography (SS-OCT) scans. Results The UCVA and BCVA in all operated eyes were better than that before surgery. The postoperative safety index and efficacy index were 1.23 and 1.19 in the group A, respectively, and 1.26 and 1.21 in the group B, respectively. In both groups, foveal CT increased significantly in high myopic patients at 2 hours and at 3 months after surgery, compared to preoperative values. The same tendencies were observed in the inner nasal and outer nasal regions. Compared with patients without GO, the increase of CT was more obvious in GO patients, 2 hours postoperatively (P = 0.006) and 3 months postoperatively (P = 0.011). Conclusions The ICL implantation is safe and effective in high myopic patients with inactive GO. Subfoveal and nasal CT may be useful parameters for monitoring the activity of GO patients.

SMILE Versus Implantable Collamer Lens Implantation for High Myopia: A Matched Comparative Study

2020 ◽  
Vol 36 (3) ◽  
pp. 150-159 ◽  
Author(s):  
Jakob Siedlecki ◽  
Valerie Schmelter ◽  
Wolfgang J. Mayer ◽  
Benedikt Schworm ◽  
Siegfried G. Priglinger ◽  
...  
Keyword(s):  
Comparative Study ◽  
High Myopia ◽  
Implantable Collamer Lens ◽  
Lens Implantation

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.

scholarly journals Comparison of Implantable Collamer Lens Visian ICL V4 and ICL V4c for high myopia

Medicine ◽  
2017 ◽  
Vol 96 (25) ◽  
pp. e7294 ◽  
Author(s):  
Ying Tian ◽  
Hai-Bo Jiang ◽  
Jian Jiang ◽  
Dan Wen ◽  
Xiao-Bo Xia ◽  
...  
Keyword(s):  
High Myopia ◽  
Implantable Collamer Lens ◽  
Icl V4c

scholarly journals Impact of the Pressure-Free Yutori Education Program on Myopia in Japan

2021 ◽  
Vol 10 (18) ◽  
pp. 4229
Author(s):  
Satoshi Ishiko ◽  
Hiroyuki Kagokawa ◽  
Noriko Nishikawa ◽  
Youngseok Song ◽  
Kazuhiro Sugawara ◽  
...  
Keyword(s):  
High Pressure ◽  
Medical Students ◽  
Observational Study ◽  
Refractive Error ◽  
High Myopia ◽  
School Curriculum ◽  
Fiscal Year ◽  
Spherical Equivalent ◽  
The Government ◽  
Medical University

This study aimed to investigate the influence of educational pressure on myopia. A less-intense school curriculum was introduced nationally in Japan beginning in 2012 based on a pressure-free education policy. In this retrospective observational study, a total of 1025 Japanese medical students of Asahikawa Medical University underwent measurements of the cycloplegic refractive error and axial length (AL), from 2011 to 2020. The spherical equivalent (SE) and AL were correlated significantly with the fiscal year of births (p = 0.004 and p = 0.034, respectively) only during enforcement of the system of high-pressure education. The SE and AL regression rates during the two educational approaches differed significantly (p = 0.004 and p = 0.037, respectively). The prevalence of high myopia was correlated significantly (p < 0.001) only during the system of high-pressure education. The regression of the prevalence rate of high myopia during the two education approaches differed significantly (p = 0.010). The progression rates of myopia and increased prevalence of high myopia were observed only during high-pressure education, suggesting that not only ophthalmologists but also educators and the government should work on together to control the progression of myopia.

Clinical results of Visian implantable collamer lens implantation according to various sizes and implantation angles

2021 ◽  
pp. 112067212110334
Author(s):  
Bu Ki Kim ◽  
Young Taek Chung
Keyword(s):  
Case Series ◽  
Clinical Results ◽  
Implantable Collamer Lens ◽  
Retrospective Case ◽  
Significant Difference ◽  
Lens Implantation ◽  
Group A ◽  
The Mean ◽  
Group B

Purpose: To investigate the clinical outcomes of Visian implantable collamer lens (ICL) implantation according to lens size and implantation angle. Setting: Onnuri Smile Eye Clinic, Seoul, Republic of Korea. Design: Retrospective case series. Methods: This study included 566 eyes of 283 patients treated with ICL implantation. Patients were divided into three groups: horizontally implanted same-sized ICL (group A), horizontally implanted different sized-ICL (group B: large ICL and small ICL) and same sized-ICL implanted with a different implantation angle (group C: horizontal and vertical). Results: At 12-month follow-up, the mean vault was 0.78 ± 17, 0.48 ± 0.13, 0.71 ± 0.18 and 0.44 ± 0.16 mm when large and small sized ICL was used in group B ( p < 0.001), and when ICL was horizontally and vertically implanted in group C ( p = 0.021), respectively. And the mean SE was −0.11 ± 0.30, −0.34 ± 0.42, −0.3 ± 0.56 and −0.64 ± 0.66 dioptres (D), when the large and the small sized ICL was used group B ( p = 0.039), and when the ICL was horizontally and vertically implanted in group C ( p = 0.036), respectively. No significant difference in UDVA, IOP and ECD between both eyes in groups B and C was observed. No statistical difference was found in the vault between both eyes for groups B and C. Conclusions: The vault was significantly higher and the SE was significantly more hyperopic when a larger-sized ICL was used or the ICL was horizontally implanted compared to when the ICL was vertically implanted.

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