1. Articles from christopher kai shun leung

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    1. Assessment of Scleral Spur Visibility With Anterior Segment Optical Coherence Tomography

      Purpose: To develop a grading system to evaluate the scleral spur visibility and to investigate the association between this and the angle width. Methods: Sixty healthy normal subjects (33 with open angles and 27 with narrow angles on dark room gonioscopy) underwent anterior segment imaging with the Visante OCT (Carl Zeiss Meditec, Dublin, CA). The anterior chamber angles at 12-o' clock hour positions were imaged and analyzed. The scleral spur at each clock hour position was independently graded by 2 observers. A scleral spur visibility score (SSVS) of 2 denotes clear visibility of the scleral spur. SSVS of 0 and ...
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    2. Longitudinal Evaluation of Optic Disc Measurement Variability With Optical Coherence Tomography and Confocal Scanning Laser Ophthalmoscopy.

      Purpose: To evaluate and compare the longitudinal variability of optical coherence tomography (OCT) and confocal scanning laser ophthalmoscopy (CSLO) optic disc measurements. Methods: A total of 25 normal and 50 glaucomatous eyes from 75 subjects were included in the analysis. The optic disc was measured by OCT and CSLO. Three separate measurements collected over an average period of 8.5±0.9 months were used to evaluate reproducibility. Univariate and multivariate regression analyses were performed to evaluate the associations between age, refraction, diagnosis (glaucoma or normal), visual field mean deviation, optic disc area, signal strength variance (OCT), optic disc area ...
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    3. Quantitative Assessment of Lens Opacities with Anterior Segment Optical Coherence Tomography

      Purpose: To evaluate the reliability of lens density measurement with anterior segment optical coherence tomography (OCT) and its association with the Lens Opacity Classification System Version III (LOCS III) grading. Methods: Fifty-five eyes from 55 age-related cataract patients were included. One eye from each subject was selected at random for lens evaluation. After dilation, lens photographs were taken with a slit lamp and graded against the LOCS III standardized condition. Anterior segment OCT imaging was performed on the same eyes with high resolution scan. The association between the anterior segment OCT nucleus density measurement and LOCS III nuclear opalescence (NO ...
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    4. Relationship between Retinal Nerve Fiber Layer Measurement and Signal Strength in Optical Coherence Tomography

      Purpose To examine the relationship between signal strength and retinal nerve fiber layer (RNFL) thickness measured by optical coherence tomography (OCT). Design Observational cross-sectional study. Participants Forty normal subjects were recruited. Methods Retinal nerve fiber layer (RNFL) thickness was measured by Stratus OCT (Carl Zeiss Meditec, Dublin, CA). In each eye, the focusing knob was adjusted to obtain 6 images with different signal strengths ranging from 5 to 10. The relationships between signal strength and RNFL thickness were examined using the Spearman correlation coefficient. The differences of RNFL thicknesses were compared with repeated-measures analysis of variance. Main Outcome Measures Retinal ...
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    5. Repeatability and reproducibility of anterior chamber angle measurement with anterior segment optical coherence tomography

      Aim: To evaluate the repeatability and reproducibility of anterior chamber angle measurement obtained by anterior segment optical coherence tomography. Methods: Twenty-five normal subjects were invited for anterior chamber angle imaging with an anterior segment optical coherence tomography (OCT) on one randomly selected eye in three separate visits within a week. Each eye was imaged three times under room light (light intensity = 368 lux) and three times in the dark during the first visit. In the subsequent visits, each eye was imaged once in the light and once in the dark. The angle opening distance (AOD 500) and the trabecular–iris ...
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    1-5 of 5
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  2. Topics in the News

    1. (5 articles) The Chinese University of Hong Kong
    2. (3 articles) UCSD
    3. (2 articles) Carl Zeiss Meditec
    4. (2 articles) Duke University
    5. (1 articles) City University of New York
    6. (1 articles) New York Eye and Ear Infirmary
    7. (1 articles) Konyang University
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