1. Articles from Chul Young Choi

    1-5 of 5
    1. Comparison of dual rotating Scheimpflug-Placido, swept-source optical coherence tomography, and Placido-scanning-slit systems

      Comparison of dual rotating Scheimpflug-Placido, swept-source optical coherence tomography, and Placido-scanning-slit systems

      Purpose To compare measurements of corneal indices using dual rotating Scheimpflug–Placido, swept-source optical coherence tomography (OCT), and Placido–scanning-slit systems. Setting Kangbuk Samsung Hospital, Seoul, South Korea. Design Prospective evaluation of diagnostic tests. Methods Corneal topography measurements were performed using dual rotating Scheimpflug–Placido (Galilei G2), swept-source OCT (Casia SS-1000), and Placido–scanning-slit (Orbscan IIz) systems. The intraclass correlation coefficients (ICCs) and Bland-Altman plots were used to evaluate the agreement between measurements. Results Fifty post-refractive surgery eyes and 50 normal eyes were evaluated. The agreement in anterior keratometry and pachymetry between the 3 devices was high in both groups ...

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    2. 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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    3. 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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    4. Changes in Central Corneal Thickness of Preserved Corneas Over Time Measured Using Anterior Segment Optical Coherence Tomography

      Purpose: To measure central corneal thickness (CCT) and investigate serial changes in CCT, using anterior segment optical coherence tomography (AS-OCT) on corneas in storage medium. Methods: Between July and August 2006, 10 human corneoscleral discs from 5 donors between 19 and 57 years of age were obtained. Corneoscleral rims were excised and were transferred to Optisol-GS (Bausch & Lomb, Irvine, CA). After preservation, AS-OCT (Visante OCT; Carl Zeiss Meditec) was performed on all corneoscleral discs to detect serial changes in CCT. The corneas were measured with AS-OCT at 0.5, 1, 2, 3, 4, 6, and 12 hours and then at 1, 2, 3, and 4 days after preservation ...
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    5. 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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    1-5 of 5
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  2. Topics in the News

    1. (4 articles) Carl Zeiss Meditec
    2. (3 articles) Sungkyunkwan University
    3. (3 articles) Joon Mo Kim
    4. (2 articles) Samsung
    5. (2 articles) Yonsei University
    6. (2 articles) Seoul National University
    7. (2 articles) Hyunjoong Kim
    8. (1 articles) University of Rochester
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    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 Comparison of dual rotating Scheimpflug-Placido, swept-source optical coherence tomography, and Placido-scanning-slit systems Successful optical coherence tomography-guided stent ablation with rotational atherectomy for an underexpanded stent Detection and analysis of early degradation at resin-dentin interface by optical coherence tomography (OCT) and confocal laser scanning microscope (CLSM) Avinger Initiates Full Commercial Launch of Tigereye(TM) Image-Guided CTO Crossing Catheter Evaluation of choroidal thickness in children with type 1 diabetes: the role of optical coherence tomography in diabetic retinopathy screening Evaluation of ocular hypoperfusion in patients with acromegaly by using optical coherence tomography angiography Retinal neurodegeneration in diabetic peripheral neuropathy by optical coherence tomography: a systematic review and meta-analysis Macular fibrosis in Coats’ disease demonstrated by Optical Coherence Tomography Angiography – new data toward pathophysiology A comparison of optic disc area measured by confocal scanning laser tomography versus Bruch’s membrane opening area measured using optical coherence tomography Diagnosis of optic nerve head drusen using enhanced depth imaging optical coherence tomography