1. Articles from Joon Mo Kim

    1-9 of 9
    1. Development and Validation of a Deep Learning System for Diagnosing Glaucoma Using Optical Coherence Tomography

      Development and Validation of a Deep Learning System for Diagnosing Glaucoma Using Optical Coherence Tomography

      This study aimed to develop and validate a deep learning system for diagnosing glaucoma using optical coherence tomography (OCT). A training set of 1822 eyes (332 control, 1490 glaucoma) with 7288 OCT images, an internal validation set of 425 eyes (104 control, 321 glaucoma) with 1700 images, and an external validation set of 355 eyes (108 control, 247 glaucoma) with 1420 images were included. Deviation and thickness maps of retinal nerve fiber layer (RNFL) and ganglion cell–inner plexiform layer (GCIPL) analyses were used to develop the deep learning system for glaucoma diagnosis based on the visual geometry group deep ...

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    2. 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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    3. Low Limit for Effective Signal Strength in the Stratus OCT in Imperative Low Signal Strength Cases

      Low Limit for Effective Signal Strength in the Stratus OCT in Imperative Low Signal Strength Cases

      PurposeTo determine the lowest limit of signal strength that is still effective for accurate analysis of optic coherence tomography (OCT) values, we investigated the reproducibility of OCT scans by signal strength (SS). MethodsA total of 668 subjects were scanned for measurements of retinal nerve fiber layer (RNFL) thickness using the Stratus OCT twice on the same day. The variability of overall RNFL thickness parameters obtained at different SS was analyzed and compared by repeated-measures of ANOVA and Spearman's correlation coefficient. Values of the intraclass correlation coefficient (ICC) and variability (standard deviation) of RNFL thickness were obtained. The false positive ...

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    4. 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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    5. 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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    6. Korean normative database for time domain optical coherence tomography to detect localized retinal nerve fiber layer defects (preliminary study)

      Korean normative database for time domain optical coherence tomography to detect localized retinal nerve fiber layer defects (preliminary study)

      Abstract Purpose  To establish a Korean normative database of retinal nerve fiber layer (RNFL) thickness. Methods  Data was collected from 103 healthy volunteers. Total ophthalmologic examinations, including fast RNFL thickness analysis by time domain optical coherence tomography (STRATUS OCT) were performed. The RNFL thickness of 64 glaucoma patients with localized RNFL defects and 48 independent healthy subjects were collected. The RNFL thickness of both the glaucoma patients and the healthy subjects was evaluated using both normative databases. Results  The average RNFL thickness of Koreans was 108.3 ± 10.3 μm. The sensitivity rates recorded in the Korean normative database with ...

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    7. Relation between Axial Length and Ocular Parameters

      Purpose: To investigate the relation between axial length (AL) and ocular parameters. Methods: Measurements of ocular biometric parameters were performed with an optical biometer, pachymeter, optical coherence tomography, and an automatic refractometer. AL, refractive error (RE), central corneal thickness, anterior chamber depth (ACD), corneal curvature (CC), white-to-white distance (WWD), and retinal nerve fiber layer (RNFL) thickness were measured. AL was evaluated in relation to ocular parameters. The Pearson correlation coefficient (r) was used to statistically evaluate each scattergram. Results: With elongation of the AL, the mean RE (r = -0.790, p < 0.001), CC (r = -0.444, p < 0.001), and RNFL thickness (r = -0.306, p < 0.001) all decreased, while the mean ACD (r = 0.506, p < 0.001) and WWD (r = 0.279, p < 0.001) increased. Conclusions: In shorter eyes, there was a tendency toward hyperopia, a steeper cornea, and a thicker RNFL, and in longer eyes toward myopia, a flatter cornea, and a thinner RNFL.

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    8. The Effect of Soft Contact Lenses During the Measurement of Retinal Nerve Fiber Layer Thickness Using Optical Coherence Tomography

      Purpose: To investigate if the measurement of retinal nerve fiber layer (RNFL) thickness using optical coherence tomography (OCT) is affected by soft contact lens wear. Methods: This prospective, observational, cross-sectional clinical study looked at 66 eyes in 66 patients who usually wear soft contact lenses everyday and 36 eyes in 36 patients who did not wear contact lenses during the 6 months prior to the study. No patients had pre-existing retinal or optic nerve pathology or other media opacities that might influence the RNFL thickness. All eyes were scanned using the fast RNFL program of the Stratus OCT with and ...

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    9. Optic Disc Hemorrhage May Be Associated with Retinal Nerve Fiber Loss in Otherwise Normal Eyes

      Purpose: To evaluate quantitatively the structural damage of the peripapillary retinal nerve fiber layer (RNFL) in eyes with disc hemorrhage (DH).Design: Prospective cross-sectional study.Participants: Seventy patients with DH (70 eyes; mean age ± standard deviation, 60.0±11.8 years) and 100 healthy control subjects (100 eyes; mean age ± standard deviation, 57.7±8.0 years) were enrolled from the Glaucoma Clinic of Seoul National University Hospital.Methods: Normal eyes without DH (group 1: normal control group) served as controls. Eyes with DH were divided into the following groups: (1) eyes with a DH, accompanied by no visible RNFL ...

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    1-9 of 9
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    1. (9 articles) Joon Mo Kim
    2. (7 articles) Sungkyunkwan University
    3. (6 articles) Seoul National University
    4. (6 articles) Carl Zeiss Meditec
    5. (4 articles) Yonsei University
    6. (4 articles) Hyunjoong Kim
    7. (3 articles) Samsung
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    Korean normative database for time domain optical coherence tomography to detect localized retinal nerve fiber layer defects (preliminary study) Effect of signal strength on reproducibility of peripapillary retinal nerve fiber layer thickness measurement and its classification by time-domain optical coherence tomography The Effect of Various Factors on Variability of Retinal Nerve Fiber Layer Thickness Measurements Using Optical Coherence Tomography Low Limit for Effective Signal Strength in the Stratus OCT in Imperative Low Signal Strength Cases The Effect of Axial Length on the Variability of Stratus Optical Coherence Tomography Development and Validation of a Deep Learning System for Diagnosing Glaucoma Using Optical Coherence Tomography Long-Term Arterial Remodeling After Bioresorbable Scaffold Implantation 4-Year Follow-up of Quantitative Coronary Angiography, Histology and Optical Coherence Tomography Visualization of Bacterial Colonization and Cellular Layers in a Gut-on-a-Chip System Using Optical Coherence Tomography Optical Coherence Tomography Measurements as Potential Imaging Biomarkers for Parkinson's Disease: A Systematic Review and Meta-analysis Use of ultra-wide field retinal imaging and optical coherence tomography angiography in the diagnosis of incomplete Susac syndrome NinePoint Medical, Inc. filed a voluntary petition for relief under Chapter 11 of the United States Bankruptcy Code Repeatability and agreement of total corneal and sublayer pachymetry with two different algorithms of fourier-domain optical coherence tomography in myopic and post photorefractive keratectomy eyes