scholarly journals Relative position of the central hole after EVO-ICL implantation for moderate to high myopia

2020 ◽  
Author(s):  
Xiaojian He ◽  
lingling niu ◽  
Huamao Miao ◽  
feng zhao ◽  
Xingtao Zhou
Keyword(s):  
Relative Position ◽  
High Myopia ◽  
Average Distance ◽  
Anterior Segment ◽  
Central Hole ◽  
Implantable Collamer Lens ◽  
Pupil Center ◽  
Nasal Side ◽  
Temporal Side

Abstract Background: This study aimed to evaluate the relative position of the central hole (C H ) of EVO Implantable Collamer Lens (EVO-ICL), the pupil center (C P ), and the corneal center (C C ) after implantation of EVO-ICLs for moderate to high myopia. Methods: Eighty-nine eyes of forty-seven patients with moderate to high myopia were evaluated. The mean preoperative spherical equivalent (SE) was -12.58 ± 4.13D. A routine postoperative follow-up was performed within 1~12 months. Positions of the C H of EVO-ICLs, the C P and the C C were recorded using a slit lamp anterior segment photography system, and their relative distances were calculated with the Visio image analysis software. Results: All surgeries were performed safely, and no complications were observed in follow-ups 4.3 ± 4.82 months after surgery. At the last follow-up, the safety index (postoperative CDVA/preoperative CDVA) was 1.23 ± 0.48, and the efficacy index (postoperative UDVA/preoperative CDVA) was 1.08 ± 0.31. The C H in 85 eyes (95.51%) was superior to the C C , with 47.19% (42/89) on the temporal side and 48.31% (43/89) on the nasal side. The C H in 84 eyes (94.38%) was located on the temporal side of the C P , with 56.18% (50/89) superior and 38.2% (34/89) inferior to the C P . The C P of eighty-five eyes (95.51%) was superior on the nasal side of the C C . On the defined x-axis, the average distance from the C H to C C was significantly shorter than the average distance from the C P to C C ( p < 0.001). Conclusions: An imperfect mismatch between the central hole of EVO-ICLs and the pupil center does not necessarily indicate ICL dislocation. Compared to the pupil center, the position of the central hole of EVO-ICL is closer to the corneal center.

scholarly journals Relative position of the central hole after EVO-ICL implantation for moderate to high myopia

2019 ◽  
Author(s):  
Xiaojian He ◽  
lingling niu ◽  
Huamao Miao ◽  
feng zhao ◽  
Xingtao Zhou
Keyword(s):  
Relative Position ◽  
High Myopia ◽  
Average Distance ◽  
Anterior Segment ◽  
Central Hole ◽  
Implantable Collamer Lens ◽  
Pupil Center ◽  
Nasal Side ◽  
Temporal Side

Abstract Background: This study aimed to evaluate the relative position of the central hole (CH) of Evolution Visian Implantable Collamer Lens (EVO-ICL), the pupil center (CP), and the corneal center (CC) after implantation of EVO-ICLs for moderate to high myopia. Methods: Eighty-nine eyes of forty-nine patients with moderate to high myopia were evaluated. The mean preoperative spherical equivalent (SE) was -12.58 ± 4.13D. A routine postoperative follow-up was performed within 1–12 months. Positions of the CH of EVO-ICLs, the CP and the CC were recorded using a slit lamp anterior segment photography system, and their relative distances were calculated with the Visio image analysis software. Results: All surgeries were performed safely, and no complications were observed in follow-ups after a mean 4.3 ± 4.82 months. At the last follow-up, the safety index (postoperative CDVA/preoperative CDVA) was 1.23 ± 0.48, and the efficacy index (postoperative UDVA/preoperative CDVA) was 1.08 ± 0.31. The CH in 85 eyes (95.51%) was superior to the CC, with 47.19% (42/89) on the temporal side and 48.31% (43/89) on the nasal side. The CH in 84 eyes (94.38%) was located on the temporal side of the CP, with 56.18% (50/89) superior and 38.2% (34/89) inferior to the CP. The CP of eighty-five eyes (95.51%) was superior on the nasal side of the CC. On the defined x-axis, the average distance from the CH to CC was significantly shorter than the average distance from the CP to CC (p < 0.001). Conclusions: An imperfect mismatch between the central hole of EVO-ICLs and the pupil center does not necessarily indicate ICL dislocation. Compared to the pupil center, the position of the central hole of EVO-ICL is closer to the corneal center.

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 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.

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.

scholarly journals Accommodation changes after visian implantable collamer lens with central hole for high myopia

Medicine ◽  
2019 ◽  
Vol 98 (28) ◽  
pp. e16434 ◽  
Author(s):  
Minjie Chen ◽  
Qiurong Long ◽  
Hao Gu ◽  
Jiaxu Hong
Keyword(s):  
High Myopia ◽  
Central Hole ◽  
Implantable Collamer Lens

scholarly journals Outcomes of implantable collamer lens V4 and V4c for correction of high myopia – a case series

2016 ◽  
Vol 7 (2) ◽  
pp. 164-172 ◽  
Author(s):  
Smita Karandikar ◽  
Vipul Bhandari ◽  
Jagdeesh Reddy
Keyword(s):  
Visual Acuity ◽  
Intraocular Pressure ◽  
High Myopia ◽  
Case Series ◽  
Visual Outcome ◽  
Visual Disability ◽  
Implantable Collamer Lens ◽  
Distant Visual Acuity ◽  
The Mean

Objective: To evaluate the visual outcomes and intraocular pressure changes after Visian Implantable Collamer Lens (ICL) implantation V4b and V4c (with centraflow technology) for correction of myopia. Materials and methods: A prospective, consecutive, comparative interventional case series of V4b and V4c ICL implantation done for correction of high myopia (>-6 diopter D) in patients unsuitable for laser vision correction. The outcome measures that were evaluated included preoperative and postoperative uncorrected distant visual acuity (UDVA), best spectacle corrected distant visual acuity (CDVA), endothelial cell count (ECC), presence of lens opacification, intraocular pressure (IOP) and ICL vaulting. A follow-up of upto 1 year was done. A questionnaire was given at the end of follow-up period. Results: A total of 30 eyes (24.56±4.8 years) underwent V4b ICL implantation (10 non-toric, 20 toric ICL-TICL) with intraoperative peripheral iridectomy (PI) and 34 eyes (26.13±3.8 years) had implantation of V4c ICL with centraflow (12 non-toric, 22 TICL). The mean preoperative manifest spherical equivalent (MSE) was 8.98±2.8 D and 9.24±2.4 D in the V4b and V4c groups respectively which reduced to postoperative values of -0.28±1.3 D and -0.19±1.18 D respectively. The mean preoperative astigmatism was -1.8±1.2 diopter cylinder (Dcyl) and -1.9±1.6 Dcyl which respectively reduced to -0.8±0.8 Dcyl and -0.9±0.3 Dcyl. At the end of 1 year follow up, mean ECC loss was 7.6% and 7.1%, mean vault was 583.12±231.12 μ and 602±241.24μ respectively in the V4b and V4c groups. Anterior subcapsular opacities were present in 6.66% and 2.94% of eyes with V4b and V4c groups respectively. Two eyes from both V4b (10%) and V4c (8.33%) had rotation of more than 30 degrees and required re-rotation surgery done successfully. Two eyes (6.66%) with V4b ICL implantation had high postoperative IOP (>35 mm Hg) and required Nd:Yag laser iridotomy later done with successful control of IOP. The safety indices were 1.12 and 1.15 and efficacy indices were 1.5 and 1.6 in the V4b and V4c groups respectively at the end of 1 year. The most common visual complaint was glare and haloes in 24% and 27% in the two groups respectively. However, they were not annoying enough to cause visual disability. Conclusions: Both V4b and V4c Visian ICL implantations are comparable in terms of visual outcome and safety profile for correction of high myopia. However, V4c ICL offers these advantages without the requirement of an additional PI. 

scholarly journals 15-month outcomes of Visian ICL implantation for high myopia in patients with shallow anterior chamber depth

2019 ◽  
Author(s):  
Lingling Niu ◽  
Huamao Miao ◽  
Tian Han ◽  
Lan Ding ◽  
Xiaoying Wang ◽  
...  
Keyword(s):  
Visual Acuity ◽  
Observational Study ◽  
Anterior Chamber ◽  
High Myopia ◽  
Anterior Chamber Depth ◽  
Implantable Collamer Lens ◽  
Distance Visual Acuity ◽  
Icl V4c ◽  
Shallow Anterior Chamber

Abstract Background: High myopia with shallow anterior chamber depth (ACD < 2.8 mm) is not rare. This observational study aims to: evaluate clinical outcomes after implantation of the Visian Implantable Collamer Lens with a central hole (ICL V4c) in these patients. Methods: A prospective cohort of consecutive 51 eyes of 31 patients (20 to 42 years old) was followed for 15.35 ± 4.90 months (12 to 25 months). The preoperative ACD was 2.74 ± 0.04 mm (2.65 to 2.79 mm). Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), intraocular pressure (IOP), manifest refraction, vault, and endothelial cell density (ECD) were measured during the follow-ups after the surgery. Results: All surgeries were performed safely and no complication was observed during the follow-ups. At the last follow-up, the safety index (postoperative CDVA / preoperative CDVA) was 1.33 ± 0.60 and the efficacy index (postoperative UDVA / preoperative CDVA) was 1.14 ± 0.54. After the surgery, no eye had decreased CDVA and 59% (30 eyes) of the eyes gained at least one line. Forty-seven eyes (92%) were within ± 1.0 D and 35 eyes (69%) were within ± 0.5 D of the attempted refraction. The mean postoperative vault was 380.00 ± 152.84 µm (90 to 700µm). The ECD was reduced by 8.38 ± 0.06% compared to the preoperative value (p < 0.001). No significant change was observed in IOP (p = 0.061) at the last follow-up. Ultrasound Biomicroscopy (UBM) showed none of the eyes had trabecular-iris angle closed. Conclusions: In this prospective observational study, ICL V4c implantation in patients with high myopia and shallow ACD achieved satisfying and stable visual outcomes. Its long-term safety and stability require further investigation. Trial Registration: This trial was retrospectively registered on 05/08/2018 under the number (ChiCTR1800017594)

scholarly journals The Progression of Peripheral Anterior Synechia after Combined Phacoemulsification with Goniosynechialysis Under an Ophthalmic Endoscope: A Three-Year Study

2021 ◽  
Author(s):  
Xinyi Liu ◽  
Yau Kei Chan ◽  
Lin Fu ◽  
Yunhe Song ◽  
Junhua Li ◽  
...  
Keyword(s):  
Recurrence Rate ◽  
Early Postoperative Period ◽  
Angle Closure ◽  
Success Rates ◽  
Recurrence Rates ◽  
Primary Angle Closure Glaucoma ◽  
Nasal Side ◽  
Temporal Side

Abstract Aim To investigate the long-term changes of peripheral anterior synechia (PAS) after phacoemulsification with goniosynechialysis under an ophthalmic endoscope (Phaco-OE-GSL) in primary angle-closure glaucoma (PACG) assisted with viscoelastics alone or viscoelastics combined with iris repositor (viscoelastics-repositor). Method A retrospective study was conducted. Thirty-nine eyes of 31 PACG patients were included. The follow-up period was 36 months. The main outcomes of the study included the changes of PAS, intraocular pressure (IOP), and the success rate.Results Phaco-OE-GSL was performed assisted with viscoelastics-alone on 20 eyes, and viscoelastics-repositor on 19 eyes. The total recurrence rates of PAS were 62.5% in viscoelastics-alone group and 87.5% in viscoelastics-repositor group. In particular, the recurrence rate of PAS at the same location at which were separated intraoperatively were 37.3% and 75.0% respectively (P=0.033). The recurrence of PAS was observed in 2 eyes in viscoelastics-alone group and 12 eyes in viscoelastics-repositor group within 1-month follow-up (P<0.001). In addition, comparing any two follow-ups 6 months after surgery, there are not significant differences in the extent of re-PAS in total eyes (P>0.05). The extent of postoperative PAS at final follow-up was positively correlated with the range of PAS preoperatively (P=0.036, r=0.356). The complete success rates were 85.0% and 89.5% of viscoelastics-alone group and viscoelastics-repositor group at 36-month follow-up respectively. Both the preoperative and postoperative distribution of PAS are mainly concentrated on the upper (84.6% and 95.8%) and nasal side (74.4% and 62.5%), followed by the inferior side, and the least on the temporal side. Conclusion In summary, although the recurrence rate of PAS was high in early postoperative period, the progression of PAS was rapidly resolved after 6 months postoperatively, and Phaco-OE-GSL is an effective treatment for the long-term control of IOP of PACG patients especially with large range of PAS (> 180°). Both preoperative and postoperative PAS are mainly concentrated on the upper and nasal side. Besides, our results suggested that mechanical separation may be easier to promote the progression of postoperative PAS than viscoelastics-alone separation.

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