Yazar "Aslan, M. Fatih" seçeneğine göre listele

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    Femtosecond Laser-Assisted Astigmatic Keratotomyfor Correction of Corneal Astigmatism DuringPhacoemulsifi cation
    (2020) Cınar, Esat; Bolu, Hulya; Yuce, Berna; Aslan, M. Fatih
    Purpose: To evaluate the outcomes of femtosecond laser-assisted arcuate keratotomy (FSAK) combined with cataract surgery in eyes with low-to-moderate corneal astigmatism.Materials and Methods: This study included patients who underwent combined femtosecond laser-assisted phacoemulsifi cation and arcuate keratotomy between October 2016 and October 2018. Keratometric astigmatism and astigmatic changes were evaluated before and six months after the surgery by vector analysis based on Alpin’s method.Results: In total, 69 eyes of 69 patients (35 female and 34 male; mean age, 60.3 ±10.5 years) were included. The mean preoperative target induced astigmatism (TIA) was 1.55±0.46 diopters (D) and postoperative astigmatism (difference vector [DV]) was 0.83±0.41 D (P<.001). The mean surgically induced astigmatism (SIA) was 1.09±0.56 D. The magnitude of error (difference between SIA and TIA) was -0.28±0.65 D and correction index (SIA/TIA ratio) was 0.71±0.34, indicating a slight undercorrection. The angle of error was near 0 (22±16 degrees), indicating no signifi cant systematic error of misaligned treatment. The index of success (IOS), which is the ratio of DV to TIA, was 0.54±0.27, indicating a success rate of 46% in the correction of astigmatism.Conclusion: Combined phacoemulsifi cation with FSAK appears to be a relatively easy and safe means for management of low-to-moderate corneal astigmatism in cataract surgery candidates.
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    Retinal and choroidal vascular changes in eyes with pseudoexfoliation syndrome: A comparative study using optical coherence tomography angiography
    (2020) Çınar, Esat; Yüce, Berna; Aslan, M. Fatih
    Background: Optical coherence tomography angiography allows a detailed evaluation of retinal and choroidal microvascular structures without the need for a contrast agent. Pseudoexfoliation syndrome is a condition that leads to anatomical and functional losses due to accumulation of degraded abnormal fibrillar material in the intraocular and extraocular tissues. Histopathological studies have shown that the accumulation of Pseudoexfoliation syndrome material in the vascular structures may play a role in different ocular pathologies such as retinal vein occlusion, iris hypoperfusion, anterior segment hypoxia, retinal arterial occlusion, and neovascular glaucoma. Aims: To evaluate and compare flow and vascular density in the retina and choroid in eyes with Pseudoexfoliation syndrome, fellow eyes without Pseudoexfoliation syndrome, and healthy eyes using optical coherence tomography angiography. Study Design: Case control study. Methods: The study included 35 eyes with Pseudoexfoliation syndrome of 35 Pseudoexfoliation syndrome patients, 32 fellow eyes without Pseudoexfoliation syndrome of 32 unilateral Pseudoexfoliation syndrome patients, and 35 eyes of healthy control subjects. Flow area and vascular density in the superficial capillary plexus and deep capillary plexus were measured by optical coherence tomography angiography as three separate parameters: total, parafoveal, and foveal. Choroidal thickness and foveal avascular zone area were measured for each patient. Results: There were significant differences between the Pseudoexfoliation syndrome eyes and control eyes in total, parafoveal, and foveal flow and vascular density in the superficial capillary plexus (p<0.05 for all), while there were no significant differences between these groups in any of the flow or vascular density values in the deep capillary plexus (p>0.05). None of the superficial capillary plexus and deep capillary plexus flow and vascular density values showed significant differences between Pseudoexfoliation syndrome eyes and non-Pseudoexfoliation syndrome fellow eyes or between the nonPseudoexfoliation syndrome fellow eyes and control eyes (p>0.05). Choroidal thickness was significantly lower in Pseudoexfoliation syndrome eyes compared to control eyes. Foveal avascular zone area was significantly enlarged in Pseudoexfoliation syndrome eyes compared to control eyes in both the superficial and deep layers (p<0.05). Conclusion: Pseudoexfoliation syndrome eyes exhibit significant damage to the retinal and choroidal vascular structures