1. Articles from Gokhan Pekel

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    1. Association of retinal biomarkers and choroidal vascularity index on optical coherence tomography using binarization method in retinitis pigmentosa

      Association of retinal biomarkers and choroidal vascularity index on optical coherence tomography using binarization method in retinitis pigmentosa

      Purpose To investigate the association of retinal biomarkers with the choroidal parameters in retinitis pigmentosa (RP). Methods This prospective study included 69 eyes of 36 patients with RP. Choroidal vascularity index (CVI) was defined as the ratio of luminal area to stromal area after binarization on EDI–OCT images. Choroidal thickness (CT); peripapillary CT, the disruptions of the ellipsoid zone (EZ) and external limiting membrane (ELM); and the existence of disorganization of the retinal inner layers (DRIL) and epiretinal membrane (ERM) in central 1000 μm were noted. Results Having DRIL and the disruption of EZ and ELM was significantly associated ...

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    2. Automated macular segmentation with spectral domain optical coherence tomography in the fellow eyes of patients with unilateral retinal vein occlusion

      Automated macular segmentation with spectral domain optical coherence tomography in the fellow eyes of patients with unilateral retinal vein occlusion

      Purpose To assess the change in the macular layers in the fellow eyes of unilateral retinal vein occlusion (RVO) patients and to evaluate whether certain layers are more affected based on RVO type. Methods This retrospective study included 87 fellow eyes of patients with unilateral RVO (26 central, 61 branch) and 105 eyes of 105 subjects without RVO. Spectral domain optical coherence tomography was used for automatized retinal segmentation. The thicknesses of retinal nerve fiber layer (RNFL), ganglion cells, inner plexiform, inner nuclear, outer plexiform, outer nuclear, photoreceptor layers, overall inner retinal layers and retinal pigment epithelium (RPE) were documented ...

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    3. New aspect for systemic effects of copd: Eye findings

      New aspect for systemic effects of copd: Eye findings

      Introduction : Chronic Obstructive Pulmonary Disease (COPD) has multisystemic implications and comorbidities. Hypoxia and systemic inflammation are thought to involve oculary structures. In this study, our aim is to evaluate retinal nerve fiber and choroidal thickness and retinal vessel diameter using the Spectral-domain optical coherence tomography (SD-OCT) in COPD subjects. Methods : 43 subjects diagnosed with COPD according to the Chronic Obstructive Lung Disease criteria at the Pulmonology Department of Pamukkale University were enrolled in the study. All subjects underwent respiratory function testing and a carbon monoxide diffusion test. To determine hypoxic state, arterial blood gas analysis was performed. The control group ...

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    4. In vivo biometric evaluation of Schlemm's canal with spectral-domain optical coherence tomography in pseuduexfoliation glaucoma

      In vivo biometric evaluation of Schlemm's canal with spectral-domain optical coherence tomography in pseuduexfoliation glaucoma

      Purpose To perform in vivo imaging of the Schlemm's canal (SC) with anterior segment spectral-domain optical coherence tomography [AS-spectral-domain (SD)-OCT] and also to measure its biometric parameters including the SC length and SC area in patients with pseudoexfoliation (PEX) glaucoma. Methods Forty-one consecutive patients with PEX glaucoma and 41 age- and sex-matched normal subjects were enrolled. All subjects underwent imaging with SD-OCT. The SC length and SC area were examined in the temporal sections and measured with customized software. Results The percentages of the temporal sections in which SC was observable were similar between the two groups. Mean ...

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    5. Choroidal thickness changes after dynamic exercise as measured by spectral-domain optical coherence tomography

      Choroidal thickness changes after dynamic exercise as measured by spectral-domain optical coherence tomography

      Purpose: To measure the choroidal thickness (CT) after dynamic exercise by using enhanced depth imaging optical coherence tomography (EDI-OCT). Materials and Methods: A total of 19 healthy participants performed 10 min of low-impact, moderate-intensity exercise (i.e., riding a bicycle ergometer) and were examined with EDI-OCT. Each participant was scanned before exercise and afterward at 5 min and 15 min. CT measurement was taken at the fovea and 1000 μ away from the fovea in the nasal, temporal, superior, and inferior regions. Retinal thickness, intraocular pressure, ocular perfusion pressure (OPP), heart rate, and mean blood pressure (mBP) were also measured. Results ...

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      Mentions: Necip Kara
    6. Comparison of Corneal Layers and Anterior Sclera in Emmetropic and Myopic Eyes

      Comparison of Corneal Layers and Anterior Sclera in Emmetropic and Myopic Eyes

      Purpose: The aim of this study was to compare the thickness of preocular tear film, corneal layers, and anterior sclera in patients with moderate to high myopia and emmetropia with anterior segment spectral domain optical coherence tomography. Methods: This cross-sectional comparative study included 31 patients with high myopia and 31 emmetropic healthy controls. Patients with myopia had axial lengths ranging from 24 to 29 mm, whereas age-matched controls had axial lengths from 21 to 23.9 mm. Patients with myopia had refractive errors from −4.00 to −11.00 diopters spherical equivalent. Preocular tear film, corneal epithelium, Bowman layer, stroma ...

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    7. Central Corneal Thickness, Anterior Chamber Depth, and Pupil Diameter Measurements Using Visante OCT, Orbscan, and Pentacam

      PURPOSE To evaluate the agreement among three different optical methods in measuring anterior chamber depth (ACD), central corneal thickness (CCT), and pupil diameter. METHODS One hundred eyes of 50 healthy patients (25 men, 25 women) were enrolled in the study. Mean patient age was 25 years (range: 21 to 32 years). Exclusion criteria were history of any intraocular or corneal surgery, contact lens wear, corneal anomalies, and spherical refraction >5.00 diopters (D) or cylindrical refraction >2.00 D. All measurements were done by the same operator under mesopic light conditions and repeated using three different optical methods: Visante optical ...
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    1-7 of 7
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    1. (2 articles) Kyungpook National University
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    Comparison of Corneal Layers and Anterior Sclera in Emmetropic and Myopic Eyes Choroidal thickness changes after dynamic exercise as measured by spectral-domain optical coherence tomography In vivo biometric evaluation of Schlemm's canal with spectral-domain optical coherence tomography in pseuduexfoliation glaucoma New aspect for systemic effects of copd: Eye findings Automated macular segmentation with spectral domain optical coherence tomography in the fellow eyes of patients with unilateral retinal vein occlusion Association of retinal biomarkers and choroidal vascularity index on optical coherence tomography using binarization method in retinitis pigmentosa A Generic Framework for Fourier-Domain Optical Coherence Tomography Imaging: Software Architecture and Hardware Implementations Vision-Inspection-Synchronized Dual Optical Coherence Tomography for High-Resolution Real-Time Multidimensional Defect Tracking in Optical Thin Film Industry Relative retinal flow velocity detection using optical coherence tomography angiography imaging Comparison of Optical Flow Ratio and Fractional Flow Ratio in Stent-Treated Arteries Immediately After Percutaneous Coronary Intervention Spaceflight Associated Neuro-Ocular Syndrome (SANS): A Systematic Review and Future Directions Retinal Thickness and Microvascular Pattern in Early Parkinson's Disease