scholarly journals Ocular higher-order aberrations changes after implantable collamer lens implantation for high myopic astigmatism

2018 ◽  
Vol 30 (2) ◽  
pp. 136-141 ◽  
Author(s):  
Seyed Javad Hashemian ◽  
Hosein Farrokhi ◽  
Alireza Foroutan ◽  
Mohammad Ebrahim Jafari ◽  
Seyed Mahyar Hashemian ◽  
...  
Keyword(s):  
Higher Order ◽  
Implantable Collamer Lens ◽  
Higher Order Aberrations ◽  
Lens Implantation ◽  
Myopic Astigmatism ◽  
High Myopic Astigmatism

scholarly journals Clinical and Refractive Outcomes of Toric Phakic Implantable Collamer lens Implantat for correction of myopic astigmatism

2019 ◽  
Vol 13 (1) ◽  
pp. 70-75
Author(s):  
Suzan Amana
Keyword(s):  
Crystalline Lens ◽  
Posterior Chamber ◽  
Implantable Collamer Lens ◽  
Corneal Surgery ◽  
Refractive Outcomes ◽  
Lens Implantation ◽  
Positive Linear Correlation ◽  
The Mean ◽  
Myopic Astigmatism ◽  
High Myopic Astigmatism

Background: Currently there are four general approaches to correct refractive errors: refractive corneal surgery, crystalline lens surgery and implantation of an intraocular lens in anterior or posterior chamber. Objective: To evaluate the predictability, safety and stability of toric phakic implantable collamer lens implantation to correct moderate to high myopic astigmatism. in  Eye Specialty Private Hospital, Baghdad, Iraq. Type of the Study: a prospective non randomize intervention study. Methods: 60 eyes of 40 patients underwent implantation of a toric implantable collamer lens (V4c design).Mean spherical refraction was ₋11.32 diopter (D) ±3.17 (SD) with range from ₋6.00 to ₋18.00D and the mean cylinder was -2.61(D) ±1.16 with range from ₋1.00 to ₋5.50D .The outcome measures that evaluated during a 12 months follow-up period include UDVA, refractive outcomes, CDVA, vault and adverse events. Results: At 12 months postoperatively the mean Snellen decimal UDVA was 0.77±0.23 and mean CDVA was 0.80±0.21, with an efficacy index 1.16. Twenty nine  eyes (48.33%) showed gain in CDVA with safety index     1.21.The treatment was highly predictable for spherical equivalent and astigmatic component .The mean SE dropped from (₋12.63D ±3.11) to ( ₋0.11 D±0.20) with 58 eyes within ±0.50 D and 60 eyes with ± 1.00D of target correction . For achieved cylinder 60 eyes (100%) had ≤0.50D and 51 eyes (85%) had ≤0.25D with strong positive linear correlation between achieved and expected cylinder(r=0.94) Conclusions: The results of the present study support safety, efficacy, predictability of toric implantable collamer lens implantation to treat moderate to high myopic astigmatism.

Phakic Toric Implantable Collamer Lens Implantation for the Correction of High Myopic Astigmatism in Eyes With Keratoconus

2008 ◽  
Vol 24 (8) ◽  
pp. 840-842 ◽  
Author(s):  
Kazutaka Kamiya ◽  
Kimiya Shimizu ◽  
Wakako Ando ◽  
Tadatoshi Fujisawa ◽  
Yoshimori Asato
Keyword(s):  
Implantable Collamer Lens ◽  
Lens Implantation ◽  
Myopic Astigmatism ◽  
High Myopic Astigmatism

Changes in Higher Order Aberrations after Wavefront-Guided Prk for Correction of Low to Moderate Myopia and Myopic Astigmatism: Two-Year Follow-Up

2007 ◽  
Vol 17 (4) ◽  
pp. 507-514 ◽  
Author(s):  
D. Wygledowska-Promienska ◽  
I. Zawojska
Keyword(s):  
Visual Acuity ◽  
Excimer Laser ◽  
Spherical Aberration ◽  
Higher Order ◽  
Control Group ◽  
Higher Order Aberrations ◽  
Order Root ◽  
Group 2 ◽  
Myopic Astigmatism ◽  
Group 1

Purpose To assess efficacy, safety, and changes in higher order aberrations after wavefront-guided photorefractive keratectomy (PRK) in comparison with conventional PRK for low to moderate myopia with myopic astigmatism using a WASCA Workstation with the MEL 70 G-Scan excimer laser. Methods A total of 126 myopic or myopic-astigmatic eyes of 112 patients were included in this retrospective study. Patients were divided into two groups: Group 1, the study group; and Group 2, the control group. Group 1 consisted of 78 eyes treated with wavefront-guided PRK. Group 2 consisted of 48 eyes treated with spherocylindrical conventional PRK. Results Two years postoperatively, in Group 1, 5% of eyes achieved an uncorrected visual acuity (UCVA) of 0.05; 69% achieved a UCVA of 0.00; 18% of eyes experienced enhanced visual acuity of −0.18 and 8% of −0.30. In Group 2, 8% of eyes achieved a UCVA of 0.1; 25% achieved a UCVA of 0.05; and 67% achieved a UCVA of 0.00 according to logMAR calculation method. Total higher-order root-mean square increased by a factor 1.18 for Group 1 and 1.6 for Group 2. There was a significant increase of coma by a factor 1.74 in Group 2 and spherical aberration by a factor 2.09 in Group 1 and 3.56 in Group 2. Conclusions The data support the safety and effectiveness of the wavefront-guided PRK using a WASCA Workstation for correction of low to moderate refractive errors. This method reduced the number of higher order aberrations induced by excimer laser surgery and improved uncorrected and spectacle-corrected visual acuity when compared to conventional PRK.

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.

One-Year Follow-up of Posterior Chamber Toric Phakic Intraocular Lens Implantation for Moderate to High Myopic Astigmatism

Ophthalmology ◽  
2010 ◽  
Vol 117 (12) ◽  
pp. 2287-2294 ◽  
Author(s):  
Kazutaka Kamiya ◽  
Kimiya Shimizu ◽  
Daisuke Aizawa ◽  
Akihito Igarashi ◽  
Mari Komatsu ◽  
...  
Keyword(s):  
Intraocular Lens ◽  
Posterior Chamber ◽  
Intraocular Lens Implantation ◽  
Phakic Intraocular Lens ◽  
Lens Implantation ◽  
One Year ◽  
Myopic Astigmatism ◽  
High Myopic Astigmatism
Sign in / Sign up

Export Citation Format

Share Document