Influence of Pupil Diameter on the Relation between Ocular Higher-Order Aberration and Contrast Sensitivity after Laser In Situ Keratomileusis

2006 ◽  
Vol 47 (4) ◽  
pp. 1334 ◽  
Author(s):  
Tetsuro Oshika ◽  
Tadatoshi Tokunaga ◽  
Tomokazu Samejima ◽  
Kazunori Miyata ◽  
Keisuke Kawana ◽  
...  
Keyword(s):  
Contrast Sensitivity ◽  
Pupil Diameter ◽  
Higher Order ◽  
Laser In Situ Keratomileusis ◽  
Higher Order Aberration

scholarly journals Wavefront Guided LASIK with a High-Resolution Aberrometer Induces Less Higher-Order Aberration than Early Custom LASIK

2020 ◽  
Author(s):  
Osamu Hieda ◽  
Chie Sotozono ◽  
Kanae Kayukawa ◽  
Shigeru Kinoshita
Keyword(s):  
High Resolution ◽  
Refractive Error ◽  
Spherical Aberration ◽  
Higher Order ◽  
Laser In Situ Keratomileusis ◽  
Control Group ◽  
Post Surgery ◽  
The Mean ◽  
Higher Order Aberration

Abstract Background: The use of 'high-resolution' aberrometer wavefront-guided LASIK system offers the theretical advantages. To date there have been a few papers that proved the clinical superiority of the 'high-resolution' wavefront-guided LASIK. The purpose of this present study was to To evaluate the surgical outcomes of wavefront-guided laser in-situ keratomileusis (LASIK) via a high-resolution aberrometer to treat myopic refractive error. Methods: This study involved 51 eyes of 26 consecutive patients (high-resolution group) who underwent wavefront-guided LASIK from 2012 to 2015 via high-resolution aberrometer and excimer laser surgical unit at the Baptist Eye Institute, Kyoto, Japan and who were followed for 6-months postoperative. Postoperative outcomes were compared with our historical control data (early custom group) from 2002 to 2007 (51 eyes of 26 patients) treated with the same correction amount. Measured parameters included Visual acuity (VA), spherical equivalent refractive error (SER), higher-order aberration (HOA), and contrast sensitivity (CS).Results: In the high-resolution group and the early custom group, the mean SER was -5.86±2.57 diopters (D) and -5.99±2.52D, respectively, and the mean patient age was 33.8±9.2 and 34.3±6.9 years, respectively. LogCS of 18 cycles-per-degree (cpd) change was more satisfactory in the high-resolution group than in the early custom group. Postoperative spherical aberration change in the high-resolution group was significantly lower than that in the control group (P<0.05). Decrease of induced spherical aberration produced a positive effect on the post LogCS of 18 cpd.Discussion: The latest wavefront-guided LASIK induced less HOAs than early custom LASIK, and although similar VA and refractive precision findings were observed, the high-resolution group tended to acquire better visual function post surgery.

Effect of Flap Homogeneity on Higher Order Aberration Induction after Femtosecond Laser in Situ Keratomileusis for Myopia

2020 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Alberto Parafita-Fernandez ◽  
Juan Gros-Otero ◽  
Cesar Villa-Collar ◽  
Montserrat García-González ◽  
Miguel Teus
Keyword(s):  
Femtosecond Laser ◽  
Higher Order ◽  
Laser In Situ Keratomileusis ◽  
Higher Order Aberration

scholarly journals Efficacy of Brimonidine Tartarate 0.2% Ophthalmic Solution on Reducing Night Vision Difficulty and Improving Contrast Sensitivity After Laser in Situ Keratomileusis

QJM ◽  
2020 ◽  
Vol 113 (Supplement_1) ◽  
Author(s):  
A M Y Alashry ◽  
A G Salman ◽  
S M Fawzy ◽  
T M Abdelaziz
Keyword(s):  
Contrast Sensitivity ◽  
Pupil Diameter ◽  
Ophthalmic Solution ◽  
Objective Evaluation ◽  
Night Vision ◽  
Laser In Situ Keratomileusis ◽  
Sensitivity Testing ◽  
Optical Zone ◽  
Brimonidine Tartrate

Abstract Background The relation between scotopic pupil diameter and the optical zone is the most important factor in limiting night vision disturbances after LASIK. Brimonidine Tartrate is a selective alpha-2 agonist which significantly reduces scotopic pupil diameter. It can be used to improve contrast sensitivity and night vision after refractive procedures. Objective Subjective and objective evaluation of the effect of Brimonidine tartrate 0.2% ophthalmic solution on improving post-LASIK night vision complaints by studying its effect on the pupil diameter, contrast sensitivity, aberrations and symptoms of night vision difficulties. Patients and Methods This prospective study was conducted upon 34 eyes of 17 patients suffering from night vision difficulties after uneventful lasik surgery. They received one drop of Brimonidine Tartrate 0. 2% ophthalmic solution on each eye and were asked to apply one drop in each eye daily for two months. Testing was performed before drops instillation, 30 minutes, 4 hours after instillation and after 2 months of regular brimonidine use. All patients had photopic and scotopic pupillometry using Zywave aberrometer built in pupillometer, Contrast sensitivity testing using Pelli-Robson chart, Aberrometry using Zywave aberrometer. Visual night complaints was assessed with an FDA approved questionnaire taken from (LASIK quality of life collaboration project). Results There was a significant decrease in mean photopic and scotopic pupil diameter, spherical and total aberrations after 30 minutes, 4 hours and 2 month of once daily use of Brimonidine. Also there was a significant improvement of contrast sensitivity that remained at acceptable levels along the follow up time. All patients showed a significant visual satisfaction after 2 month of treatment. Conclusion Brimonidine tartrate 0. 2% ophthalmic solution can be effective in reducing night vision difficulties after LASIK by reducing scotopic pupil diameter, improving contrast sensitivity and decreasing higher order aberrations.

Ocular Higher-Order Aberrations and Contrast Sensitivity after Conventional Laser In Situ Keratomileusis

2004 ◽  
Vol 45 (11) ◽  
pp. 3986 ◽  
Author(s):  
Nayori Yamane ◽  
Kazunori Miyata ◽  
Tomokazu Samejima ◽  
Takahiro Hiraoka ◽  
Takahiro Kiuchi ◽  
...  
Keyword(s):  
Contrast Sensitivity ◽  
Higher Order ◽  
Laser In Situ Keratomileusis ◽  
Higher Order Aberrations ◽  
Conventional Laser

Comparison of higher-order aberrations after wavefront-guided laser in situ keratomileusis and laser-assisted subepithelial keratectomy

2006 ◽  
Vol 32 (5) ◽  
pp. 779-784 ◽  
Author(s):  
So-Hyang Chung ◽  
In Sik Lee ◽  
Young Ghee Lee ◽  
Hyung Keun Lee ◽  
Eung Kweon Kim ◽  
...  
Keyword(s):  
Higher Order ◽  
Laser In Situ Keratomileusis ◽  
Higher Order Aberrations

scholarly journals Comparison of Higher-Order Aberration and Contrast Sensitivity in Monofocal and Multifocal Intraocular Lenses

2007 ◽  
Vol 48 (4) ◽  
pp. 627 ◽  
Author(s):  
Chang Yeom Kim ◽  
So-Hyang Chung ◽  
Tae-im Kim ◽  
Young Jae Cho ◽  
Geunyoung Yoon ◽  
...  
Keyword(s):  
Contrast Sensitivity ◽  
Higher Order ◽  
Intraocular Lenses ◽  
Multifocal Intraocular Lenses ◽  
Higher Order Aberration

Contrast Sensitivity and Laser In Situ Keratomileusis

2003 ◽  
Vol 43 (2) ◽  
pp. 93-100 ◽  
Author(s):  
Richard S. Hoffman ◽  
Mark Packer ◽  
I. Howard Fine
Keyword(s):  
Contrast Sensitivity ◽  
Laser In Situ Keratomileusis
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