Fakülteler / Faculties

Permanent URI for this communityhttps://hdl.handle.net/11727/1395

Browse

Filters

2016 - 20172

Settings

Author: search.filters.author.Asena, LeylaSubject: search.filters.subject.Astigmatism

Search Results

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Comparison of Keratometric Measurements Obtained by the Verion Image Guided System with Optical Biometry and Auto-Keratorefractometer
    (2017) Asena, Leyla; Gungor, Sirel Gur; Akman, Ahmet; 0000-0002-6848-203X; 0000-0001-6178-8362; 27271763; E-5914-2016; AAD-5967-2021
    The aim of this study was to compare the keratometric measurements of Verion Image Guided System with an optical biometer (Zeiss IOLMaster 500, Carl Zeiss Meditec, Jena, Germany) and an automated keratorefractometer (AKR) (Topcon KR-8900, Topcon, Japan). In this prospective clinical trial, the right eyes of 52 patients with cataract were examined (mean age 62.25 +/- 12.16 years). The measurements were taken by the three systems in a random order. Keratometric data, magnitude of astigmatism, and astigmatic axis measurements from all three instruments were compared. The results were evaluated using, intraclass correlation coefficients (ICC), Bland-Altman plots, and paired samples t tests. The mean flat/steep K of Verion, IOLMaster, and AKR were 43.22 +/- 1.38D/44.23 +/- 1.46D, 43.07 +/- 1.26D/44.05 +/- 1.34D, and 43.07 +/- 1.31D/43.89 +/- 1.42D, respectively. Flat K readings of Verion were higher than IOLMaster and AKR (p < 0.05 for both). Steep K readings were different for all three (p < 0.05). The magnitude of astigmatism by Verion and IOLMaster were 0.98 +/- 0.65D and 0.98 +/- 0.59D (p = 0.88). The mean astigmatism measured by the AKR was 0.82 +/- 0.62D, less than the other two instruments (p < 0.001). Astigmatic axis measurements of Verion and AKR differed < 10A degrees in 38, between 10A degrees and 20A degrees in 5, and > 20A degrees in 9 eyes; the same difference was 30, 11, and 11 eyes, respectively, between Verion and IOLMaster. Although, keratometric and astigmatic results obtained from Verion were not completely interchangeable with IOLMaster and AKR, especially the agreement between Verion and IOLMaster was excellent with ICCs close to one. However, there were pronounced astigmatic axis measurement differences between three instruments.
  • No Thumbnail Available
    Item
    Visual Rehabilitation After Penetrating Keratoplasty
    (2016) Asena, Leyla; Altinors, Dilek D.; 0000-0002-6848-203X; 0000-0001-5223-0279; 27805532; E-5914-2016; AAK-8077-2021
    Objectives: Here, our aim was to report our treatment strategies and their results performed for visual rehabilitation after penetrating keratoplasty. Materials and Methods: The medical records of 98 patients (54 male/44 female), with results from 104 eyes, who underwent penetrating keratoplasty between January 2013 and January 2015 at the Baskent University Faculty of Medicine, Department of Ophthalmology were reviewed. Patient age, indication for penetrating keratoplasty, interventions performed for visual rehabilitation, follow-up duration, topo graphic and refractive astigmatism at the end of follow-up, and final best corrected visual acuity results were recorded. Results: Mean age of patients was 54 +/- 23 years. Indications for penetrating keratoplasty included keratoconus, Fuchs endothelial dystrophy, pseu dophakic bullous keratopathy, and corneal scarring. The mean duration of follow-up was 23 +/- 11.5 months. Topography-guided suture adjustment and selective suture removal were performed 2 to 6 weeks and after 3 months in eyes with more than 3 diopters of corneal astigmatism in patients who had continuous and interrupted sutures. Spectacle correction was administered for 86 eyes (83%), and contact lenses including rigid gas-permeable and scleral lenses were fitted in 18 eyes (17%) in patients who were unsatisfied with spectacle correction. Relaxing corneal incisions were performed in 23 eyes (22%), and toric intraocular lens implantations were performed in 34 eyes (33%) with cataracts. The mean topographic and absolute refractive astigmatism at the end of followup was 3.4 +/- 2.6 and 3.6 +/- 1.9 diopters. Conclusions: Topography-guided suture adjustment and selective suture removal are effective for minimizing early postoperative astigmatism. If significant astigmatism remains after suture removal, which cannot be corrected by optical means, then further surgical procedures including relaxing incisions and toric intraocular lens implantation can be performed.