1. Articles from Hyunjoong Kim

    1-12 of 12
    1. Pseudophakic Macular Edema in Primary Open-Angle Glaucoma: a Prospective Study Using Spectral-Domain Optical Coherence Tomography

      Pseudophakic Macular Edema in Primary Open-Angle Glaucoma: a Prospective Study Using Spectral-Domain Optical Coherence Tomography

      Purpose To determine the incidence of and risk factors for pseudophakic macular edema (PME) after uncomplicated cataract surgery in primary open-angle glaucoma (POAG) using spectral-domain optical coherence tomography (SD-OCT). Design Cohort study Methods Macular retinal thickness was evaluated using SD-OCT at 1-week before surgery and at 1-, 3-, 6-, and 12-months postoperatively, in 70 POAG and 68 control eyes. Forty-three healthy subjects without impaired vision or cystoid PME were recruited separately as pilot samples to define significant PME. Significant PME was defined as an increase in the average thickness exceeding the mean+three standard deviations of the increase shown in ...

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    2. Factors Associated with the Retinal Nerve Fiber Layer Loss after Acute Primary Angle Closure: A Prospective EDI-OCT Study

      Factors Associated with the Retinal Nerve Fiber Layer Loss after Acute Primary Angle Closure: A Prospective EDI-OCT Study

      Purpose To determine the factors associated with retinal nerve fiber layer (RNFL) loss in eyes with acute primary angle-closure (APAC), particularly focusing on the influence of the change in the anterior lamina cribrosa surface depth (LCD). Methods After the initial presentation, 30 eyes with unilateral APAC were followed up at the following specific time points over a 12-month period: 1 week, 1~2 months, 2~3 months, 5~6 months, and 11~12 months. These follow-ups involved intraocular pressure measurements, enhanced depth-imaging spectral-domain optical coherence tomography (SD-OCT) scanning of the optic disc, and measurements of the circumpapillary RNFL thickness. The ...

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    3. Comparison of the Abilities of SD-OCT and SS-OCT in Evaluating the Thickness of the Macular Inner Retinal Layer for Glaucoma Diagnosis

      Comparison of the Abilities of SD-OCT and SS-OCT in Evaluating the Thickness of the Macular Inner Retinal Layer for Glaucoma Diagnosis

      Purpose To compare the abilities of spectral-domain optical coherence tomography (OCT) (SD-OCT; Spectralis, Heidelberg Engineering) and swept-source OCT (SS-OCT; DRI-OCT1 Atlantis system, Topcon) for analyzing the macular inner retinal layers in diagnosing glaucoma. Methods The study included 60 patients with primary open-angle glaucoma (POAG) and 60 healthy control subjects. Macular cube area was scanned using SD-OCT and SS-OCT on the same day to assess the thicknesses of the macular retinal nerve fiber layer (mRNFL), ganglion cell layer plus inner plexiform layer (GCIPL), and total retinal layer in nine subfields defined by the Early Treatment Diabetic Retinopathy Study (ETDRS). The abilities ...

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    4. Correlation between depth and area of retinal nerve fiber layer defect as measured by spectral domain optical coherence tomography

      Correlation between depth and area of retinal nerve fiber layer defect as measured by spectral domain optical coherence tomography

      Background To evaluate the correlation between the depth and area of retinal nerve fiber layer (RNFL) defect, as measured on an RNFL map of spectral-domain optical coherence tomography (SD-OCT). Methods The RNFL of 472 glaucoma subjects and of 217 healthy subjects was imaged by an SD-OCT. RNFL defect depth and area on the RNFL map were expressed as an RNFL defect depth percentage index (RDPI) and an RNFL defect area index (RDAI), respectively, according to the following two formulas: 100×[1–{summation of thicknesses of RNFL defects/summation of thicknesses of upper 95th percentile range of age-matched healthy subjects in ...

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    5. Reproducibility of Spectral-Domain Optical Coherence Tomography RNFL Map for Glaucomatous and Fellow Normal Eyes in Unilateral Glaucoma

      Reproducibility of Spectral-Domain Optical Coherence Tomography RNFL Map for Glaucomatous and Fellow Normal Eyes in Unilateral Glaucoma

      Purpose: To compare the reproducibility of the optical coherence tomography (OCT) retinal nerve fiber layer (RNFL) thickness map between glaucomatous and fellow normal eyes of unilateral glaucoma patients. Methods: In this prospective case-control study, Cirrus HD-OCT was performed for 79 unilateral glaucoma patients 3 times on the first visit and on 3 subsequent visits within a 2-month period. Test-retest standard deviation (TRT-SD) and tolerance limit based on the 1.645×√2×TRT-SD formula were derived for RNFL thicknesses at the respective superpixels of the RNFL thickness map. Results: The TRT-SDs and tolerance limits of the glaucomatous eyes (TRT-SD: 2.75 ...

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    6. Reproducibility of Spectral-domain Optical Coherence Tomography RNFL Map for Glaucomatous and Fellow Normal Eyes in Unilateral Glaucoma

      Reproducibility of Spectral-domain Optical Coherence Tomography RNFL Map for Glaucomatous and Fellow Normal Eyes in Unilateral Glaucoma

      Purpose: To compare the reproducibility of the optical coherence tomography (OCT) retinal nerve fiber layer (RNFL) thickness map between glaucomatous and fellow normal eyes of unilateral glaucoma patients. Methods: In this prospective case-control study, Cirrus HD-OCT was performed for 79 unilateral glaucoma patients 3 times on the first visit and on 3 subsequent visits within a 2-month period. Test-retest standard deviation (TRT-SD) and tolerance limit based on the 1.645x[square root]2xTRT-SD formula were derived for RNFL thicknesses at the respective superpixels of the RNFL thickness map. Results: The TRT-SDs and tolerance limits of the glaucomatous eyes (TRT-SD: 2 ...

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    7. The Effect of Axial Length on the Variability of Stratus Optical Coherence Tomography

      The Effect of Axial Length on the Variability of Stratus Optical Coherence Tomography

      Purpose To evaluate the effect of axial length on the variability of retinal nerve fiber layer (RNFL) thickness measurements using the Stratus optical coherence tomography (OCT) in normal and glaucomatous eyes. Methods We measured the RNFL thickness in 474 subjects using the Stratus OCT twice during the same day. Axial length was measured with the IOLMaster, and refractive error was the absolute value of the spherical equivalent measured with an auto ref-keratometer. Standard deviation in overall mean RNFL thickness was used as the dependent variable to identify significant correlations. Results Long axial length affected the variability in the RNFL thickness ...

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    8. The Effect of Various Factors on Variability of Retinal Nerve Fiber Layer Thickness Measurements Using Optical Coherence Tomography

      The Effect of Various Factors on Variability of Retinal Nerve Fiber Layer Thickness Measurements Using Optical Coherence Tomography

      Purpose To evaluate the effects of various factors on the variability of retinal nerve fiber layer (RNFL) thickness measurements using the Stratus optical coherence tomography (OCT) in normal and glaucomatous eyes. MethodsFour hundred seventy-four subjects (103 normal eyes and 371 glaucomatous eyes) were scanned to determine the RNFL thickness measurements using the Stratus OCT. Measurements were obtained twice during the same day. The standard deviation (SD) was used to compare the variability in RNFL thickness measurements of the normal subjects to that of the glaucomatous patients. Multivariate regression analysis was used to evaluate which covariates were independent predictors of SD ...

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    9. Glaucoma Progression After the First-detected Optic Disc Hemorrhage by Optical Coherence Tomography

      Glaucoma Progression After the First-detected Optic Disc Hemorrhage by Optical Coherence Tomography

      Purpose: To evaluate the progression of glaucoma after first detected disc hemorrhage (DH) by time-domain optical coherence tomography (OCT). Methods: Forty-four eyes with a unilateral DH were allocated to the DH group and 44 fellow eyes to the non-DH group. OCT signal decrease indicating retinal nerve fiber layer thinning was defined as a decrease beyond the upper 95% limit of test-retest variability defined at the 95% confidence level of 44 control patients. The DH and non-DH groups were compared in terms of OCT-derived glaucoma progressions after the first detected DH. In addition, clock-hour locations of the OCT-derived progression were compared ...

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    10. Effect of signal strength on reproducibility of circumpapillary retinal nerve fiber layer thickness measurement and its classification by spectral-domain optical coherence tomography

      Effect of signal strength on reproducibility of circumpapillary retinal nerve fiber layer thickness measurement and its classification by spectral-domain optical coherence tomography

      Abstract Purpose  To assess the effect of signal strength (SS) on the reproducibility of circumpapillary retinal nerve fiber layer (cpRNFL) thickness measurement (measurement agreement) and its color-coded classification (classification agreement) by Cirrus spectral-domain optical coherence tomography (OCT). Methods  Seven hundred and eighty-nine participants, consecutively enrolled from December 2009 to August 2010, underwent two repeated Cirrus OCT scans to measure cpRNFL thickness (optic disc cube 200 × 200). Intraclass correlation (ICC) and linear-weighted kappa coefficient (κ) were calculated as indicators for cpRNFL measurement and classification agreement. The difference in cpRNFL thickness measurements between repeated OCT scans (inter-scan measurement difference) was correlated with mean ...

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    11. Effect of signal strength on reproducibility of peripapillary retinal nerve fiber layer thickness measurement and its classification by time-domain optical coherence tomography

      Effect of signal strength on reproducibility of peripapillary retinal nerve fiber layer thickness measurement and its classification by time-domain optical coherence tomography
      PURPOSE: To assess the effect of signal strength (SS) on reproducibility of peripapillary retinal nerve fiber layer (RNFL) thickness measurement (measurement agreement) and its color-coded classification (classification agreement) by time-domain optical coherence tomography (OCT). METHODS: Two consecutive Stratus OCT scans with the Fast RNFL protocol were performed in 658 participants. Intraclass correlations and the linear-weighted kappa coefficient were calculated as indicators of RNFL measurement and classification agreement in participants grouped according to the difference in SS between consecutive OCT scans (interscan SS difference). RESULTS: Groups with a larger interscan SS difference (= 2) had lower measurement agreement than those with a ...
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    12. Ability of Stratus OCT to Detect Progressive Retinal Never Fiber Layer Atrophy in Glaucoma

      PURPOSE. To evaluate the ability of Stratus optical coherence tomography (OCT) to detect progressive glaucomatous retinal nerve fiber layer (RNFL) atrophy observed using red-free RNFL photography. METHODS. Intersession test-retest variability of each clock hour, quadrant, and average RNFL thickness was determined using 53 control subjects. The sensitivity and specificity of OCT for identification of progressive RNFL atrophy were tested on subjects in whom this condition was clearly observed in red-free RNFL photographs (n=27) and in another control group (n=62) using criteria derived from test-retest variability. RESULTS. The sensitivity of Stratus OCT RNFL measurement ranged from 14.8% (for ...

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    1-12 of 12
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  2. Topics in the News

    1. (12 articles) Hyunjoong Kim
    2. (9 articles) Carl Zeiss Meditec
    3. (8 articles) Yonsei University
    4. (7 articles) Seoul National University
    5. (5 articles) Tae-Woo Kim
    6. (4 articles) Eun Ji Lee
    7. (3 articles) Joon Mo Kim
    8. (2 articles) Dong Myung Kim
    9. (2 articles) Topcon Medical Systems
    10. (2 articles) Heidelberg Engineering
    11. (2 articles) Kyungpook National University
    12. (2 articles) University of Washington
    13. (2 articles) Jeehyun Kim
    14. (2 articles) Ruchire Eranga Wijesinghe
    15. (2 articles) Mansik Jeon
    16. (1 articles) University of Ulsan
    17. (1 articles) Tokyo Medical & Dental University
    18. (1 articles) University of Toronto
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    Effect of signal strength on reproducibility of peripapillary retinal nerve fiber layer thickness measurement and its classification by time-domain optical coherence tomography Effect of signal strength on reproducibility of circumpapillary retinal nerve fiber layer thickness measurement and its classification by spectral-domain optical coherence tomography Glaucoma Progression After the First-detected Optic Disc Hemorrhage by Optical Coherence Tomography The Effect of Various Factors on Variability of Retinal Nerve Fiber Layer Thickness Measurements Using Optical Coherence Tomography The Effect of Axial Length on the Variability of Stratus Optical Coherence Tomography Reproducibility of Spectral-domain Optical Coherence Tomography RNFL Map for Glaucomatous and Fellow Normal Eyes in Unilateral Glaucoma Correlation between depth and area of retinal nerve fiber layer defect as measured by spectral domain optical coherence tomography Comparison of the Abilities of SD-OCT and SS-OCT in Evaluating the Thickness of the Macular Inner Retinal Layer for Glaucoma Diagnosis Pseudophakic Macular Edema in Primary Open-Angle Glaucoma: a Prospective Study Using Spectral-Domain Optical Coherence Tomography 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