1. Articles from Hyoung Won Bae

    1-13 of 13
    1. Relationship between N95 Amplitude of Pattern Electroretinogram and Optical Coherence Tomography Angiography in Open-Angle Glaucoma

      Relationship between N95 Amplitude of Pattern Electroretinogram and Optical Coherence Tomography Angiography in Open-Angle Glaucoma

      Purpose: The pattern electroretinogram (PERG) is useful to detect retinal ganglion cell (RGC) damage in patients with glaucoma. Optical coherence tomography angiography (OCTA) measures retinal vessel density (VD), which is known to be reduced in glaucoma. There may be correlations between parameters of the PERG and OCTA in open-angle glaucoma (OAG). Methods: In total, 95 eyes of 95 OAG patients and 102 eyes of 102 normal controls were included in this study. N35, P50, and N95 latency along with P50 and N95 amplitude were obtained using the PERG. Retinal VD was measured around the peripapillary and macular area according to ...

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    2. Evaluating anterior segment structure using anterior segment optical coherence tomography in malignant glaucoma after Ahmed valve implantation

      Evaluating anterior segment structure using anterior segment optical coherence tomography in malignant glaucoma after Ahmed valve implantation

      Rationale: Malignant glaucoma is a rare condition that can be associated with surgery for glaucoma. In the present case report, we describe a case of malignant glaucoma occurring a week after Ahmed valve implantation. The change in anterior segment structure was identified using anterior segment optical coherence tomography (AS-OCT). Patient concerns: The 86-year-old woman with pseudoexfoliation glaucoma underwent Ahmed valve implantation. A week later, the intraocular pressure (IOP) increased to 74 mm Hg. Diagnosis: The anterior chamber was totally collapsed with conjunctival injection and edematous cornea. Finally, the patient was diagnosed with malignant glaucoma. The structure of anterior chamber was ...

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    3. Effect of systemic blood pressure on optical coherence tomography angiography in glaucoma patients

      Effect of systemic blood pressure on optical coherence tomography angiography in glaucoma patients

      Background The association between retinal microvascular structure and glaucoma has been revealed in multiple studies using optical tomography angiography (OCTA), but limited information on the macular vessel density (mVD) in patients with glaucoma is available. In this study, we tried to identity the factors that affected macular VD (mVD) in glaucomatous eyes. Methods This retrospective cross-sectional study evaluated OCT and OCTA images from 92 eyes from 58 healthy subjects and 179 eyes from 103 glaucoma patients using the SD-OCT database from July 2017 to July 2018. Glaucomatous eyes were further divided into two groups according to history of disc haemorrhage ...

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    4. Effect of image quality fluctuations on the repeatability of thickness measurements in swept-source optical coherence tomography

      Effect of image quality fluctuations on the repeatability of thickness measurements in swept-source optical coherence tomography

      This study investigated the effect of image quality fluctuations on the repeatability of thickness measurements of the peripapillary retinal nerve fibre (PP-RNFL) and ganglion cell-inner plexiform (GC-IPL) layers using swept-source optical coherence tomography (SS-OCT). Three consecutive OCT scans each were performed on 56 healthy subject. Finally, 168 SS-OCT results were analysed. Based on the tertile values of the mean absolute difference of image quality score, all subjects were divided into the following three groups—low-(LIQD), moderate-(MIQD), and high-(HIQD) image quality score difference groups. A linear mixed model and intraclass correlation coefficients (ICCs) were used for analyses. Despite ...

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    5. Factors associated with macular vessel density measured by optical coherence tomography angiography in healthy and glaucomatous eyes

      Factors associated with macular vessel density measured by optical coherence tomography angiography in healthy and glaucomatous eyes

      Purpose To investigate factors associated with macular vessel density and to analyze their effects according to glaucoma stage. Study design Retrospective cross-sectional study. Methods A total of 72 healthy eyes and 147 open-angle glaucomatous eyes were studied. All eyes underwent optical coherence tomography and visual field examinations. Clinical variables were compared according to the glaucoma stage. Relationships between macular vessel density (mVD) and other variables were analyzed using linear regression and segmented analyses. Results Age ( P = 0.010) and signal strength ( P < 0.001) were associated with macular vessel density in healthy eyes. In glaucomatous eyes, age, signal strength, ganglion ...

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    6. Diagnostic ability of vessel density measured by spectral-domain optical coherence tomography angiography for glaucoma in patients with high myopia

      Diagnostic ability of vessel density measured by spectral-domain optical coherence tomography angiography for glaucoma in patients with high myopia

      Although early glaucoma detection is important to prevent visual loss due to disease progression, its clinical diagnosis in highly myopic eyes is still difficult. Many studies using optical coherence tomography (OCT) angiography (OCTA) reported decreased vessel density (VD) in glaucomatous eyes compared to normal eyes. We evaluated the diagnostic ability of peripapillary VD and macular VD measured by OCTA, comparing them with conventional valuables such as peripapillary retinal nerve fibre layer (RNFL) thickness and macular ganglion cell-inner plexiform layer (GCIPL) thickness measured by OCT. We also calculated the average VD ratio (VDR) (average outer macular VD/average inner macular VD ...

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    7. Nomogram Using Optical Coherence Tomography and Visual Field Parameters to Predict Brain Lesions in Patients with Bitemporal Hemianopia

      Nomogram Using Optical Coherence Tomography and Visual Field Parameters to Predict Brain Lesions in Patients with Bitemporal Hemianopia

      Purpose : This study aims to develop a nomogram to predict brain lesions in patients with complete or incomplete bitemporal hemianopia by combining results from optical coherence tomography (OCT) and visual field (VF) testing. Material and Methods : We reviewed the medical records of patients who underwent magnetic resonance imaging (MRI) to identify brain lesions due to bitemporal hemianopia between January 2010 and March 2017, retrospectively. The patients were divided into two groups based on MRI findings: brain-lesion (+) group that had brain lesions on MRI ( n = 63), and brain-lesion (-) group without brain lesions on MRI ( n = 16). We compared OCT and VF ...

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    8. Diagnostic Ability of Swept-Source and Spectral-Domain Optical Coherence Tomography for Glaucoma

      Diagnostic Ability of Swept-Source and Spectral-Domain Optical Coherence Tomography for Glaucoma

      Purpose To compare the diagnostic abilities of swept-source optical coherence tomography (OCT) [Deep Range Imaging OCT-1 (DRI-OCT)] and spectral-domain OCT (Cirrus HD-OCT) for glaucoma in Korean adults. Materials and Methods This retrospective study involved measuring peripapillary retinal nerve fiber layer (PP-RNFL) thickness, full macular thickness, and ganglion cell-inner plexiform layer (GC-IPL) thickness on two different OCT systems. We used three-dimensional optic disc scanning of DRI-OCT and included 12 clock-hour sectors for measurement of the PP-RNFL. Areas under receiver operating characteristic curves (AUCs) were calculated and compared to determine how well each system could distinguish control and glaucomatous patients. Results Ninety-one ...

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    9. Repeatability and Agreement of Swept Source and Spectral Domain Optical Coherence Tomography Evaluations of Thickness Sectors in Normal Eyes

      Repeatability and Agreement of Swept Source and Spectral Domain Optical Coherence Tomography Evaluations of Thickness Sectors in Normal Eyes

      Purpose of the Study: The purpose of the study was to evaluate the clinical efficacy of swept-source optical coherence tomography (SS-OCT), we compared the intradevice repeatability of thickness measurements obtained using SS-OCT to that of measurements obtained using spectral domain OCT (SD-OCT), and assessed the interdevice agreement of thickness measurements. Materials and Methods: This cross-sectional prospective study involved 3 consecutive measurements of peripapillary retinal nerve fiber layer (PP-RNFL) and ganglion cell-inner plexiform layer thickness in healthy subjects, using 2 different OCT systems. Intraclass correlation coefficients (ICCs) and coefficients of variability were calculated and compared for repeatability and agreement between study ...

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    10. Influence of epiretinal membrane on the measurement of peripapillary retinal nerve fibre layer thickness using spectral-domain coherence tomography

      Influence of epiretinal membrane on the measurement of peripapillary retinal nerve fibre layer thickness using spectral-domain coherence tomography

      Background/aims To investigate the effect of epiretinal membrane (ERM) on peripapillary retinal nerve fibre layer (RNFL) thickness measurements using spectral-domain optical coherence tomography (Spectralis; Heidelberg Engineering). Methods A total of 134 patients with idiopathic ERM and 63 healthy controls were included in this observational comparative study. We categorised ERMs into three severity grades, based on retinal appearance in macular scans. All eyes with ERM were classified into two groups; those involving the peripapillary scan area (ERM+pp, n=68 eyes) and not involving the peripapillary scan area (ERM−pp, n=66 eyes) using the macular disc scan. Peripapillary RNFL ...

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    11. Frequency, Type and Cause of Artifacts in Swept-Source and Cirrus HD Optical Coherence Tomography in Cases of Glaucoma and Suspected Glaucoma

      Frequency, Type and Cause of Artifacts in Swept-Source and Cirrus HD Optical Coherence Tomography in Cases of Glaucoma and Suspected Glaucoma

      Purpose : To evaluate and compare the frequency , type and cause of imaging artifacts incurred when using swept - source optical coherence tomography (SS OCT) and Cirrus HD OCT in the same patients on the same day. Materials and methods : From left eye OCT results of 72 patients, disc area and macular area data could be compared between the two types of OCT. For each scan, the final printout report and source data were examined. For comparison between the two types of OCT, only source image data were used because of differences in the final printout report format. Results : There were no ...

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    12. Visual Fields and OCT Role in Diagnosis of Glaucoma

      Visual Fields and OCT Role in Diagnosis of Glaucoma

      Purpose: To evaluate the clinical performance of visual field (VF) tests and optical coherence tomography (OCT) in diagnosing glaucoma. Methods: One hundred sets of disc photographs, red-free fundus photographs, VF tests, and OCT images were presented progressively to seven ophthalmologists. Each set was provided in three steps: (1) the disc and red-free fundus photographs were shown first; (2) then, VF tests were also provided; and (3) finally, the OCT results were provided. The same process was repeated on another day. Kappa statistics were used to assess the intraobserver and interobserver agreement, as well as the agreement with the reference standard ...

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    13. A Hierarchical Cluster Analysis of Normal-Tension Glaucoma Using Spectral-Domain Optical Coherence Tomography Parameters

      A Hierarchical Cluster Analysis of Normal-Tension Glaucoma Using Spectral-Domain Optical Coherence Tomography Parameters

      Purpose: Normal-tension glaucoma (NTG) is a heterogenous disease, and there is still controversy about subclassifications of this disorder. On the basis of spectral-domain optical coherence tomography (SD-OCT), we subdivided NTG with hierarchical cluster analysis using optic nerve head (ONH) parameters and retinal nerve fiber layer (RNFL) thicknesses. Patients and Methods: A total of 200 eyes of 200 NTG patients between March 2011 and June 2012 underwent SD-OCT scans to measure ONH parameters and RNFL thicknesses. We classified NTG into homogenous subgroups based on these variables using a hierarchical cluster analysis, and compared clusters to evaluate diverse NTG characteristics. Results: Three ...

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    1-13 of 13
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    1. (11 articles) Chan Yun Kim
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    A Hierarchical Cluster Analysis of Normal-Tension Glaucoma Using Spectral-Domain Optical Coherence Tomography Parameters Visual Fields and OCT Role in Diagnosis of Glaucoma Frequency, Type and Cause of Artifacts in Swept-Source and Cirrus HD Optical Coherence Tomography in Cases of Glaucoma and Suspected Glaucoma Influence of epiretinal membrane on the measurement of peripapillary retinal nerve fibre layer thickness using spectral-domain coherence tomography Repeatability and Agreement of Swept Source and Spectral Domain Optical Coherence Tomography Evaluations of Thickness Sectors in Normal Eyes Diagnostic Ability of Swept-Source and Spectral-Domain Optical Coherence Tomography for Glaucoma Nomogram Using Optical Coherence Tomography and Visual Field Parameters to Predict Brain Lesions in Patients with Bitemporal Hemianopia Diagnostic ability of vessel density measured by spectral-domain optical coherence tomography angiography for glaucoma in patients with high myopia Factors associated with macular vessel density measured by optical coherence tomography angiography in healthy and glaucomatous eyes Effect of image quality fluctuations on the repeatability of thickness measurements in swept-source optical coherence tomography In vivo dynamic characterization of the human tympanic membrane using pneumatic optical coherence tomography Negative Vessel Remodeling in Stargardt Disease Quantified with Volume-Rendered Optical Coherence Tomography Angiography