1. Articles from Tommy C. Y. Chan

    1-6 of 6
    1. Comparison of corneal measurements in keratoconus using swept-source optical coherence tomography and combined Placido–Scheimpflug imaging

      Comparison of corneal measurements in keratoconus using swept-source optical coherence tomography and combined Placido–Scheimpflug imaging

      Purpose The aim of this study was to provide a comprehensive comparison of reliability of corneal topographic measurements in keratoconic eyes using swept-source optical coherence tomography (OCT) and a combined Placido–Scheimpflug imaging. Methods A total of 30 eyes of 30 patients were included. The mean age was 31.2 ± 8.4 years. Two consecutive topographic measurements were obtained for one eye of each patient using swept-source OCT (CASIA) and combined Placido–Scheimpflug imaging (TMS-5). Test–retest reliability of CASIA and TMS-5 measurements including central corneal thickness (CCT) and thinnest corneal thickness (TCT), keratometry at steep (Ks) and flat (Kf ...

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    2. Longitudinal Evaluation of Cornea With Swept-Source Optical Coherence Tomography and Scheimpflug Imaging Before and After Lasik

      Longitudinal Evaluation of Cornea With Swept-Source Optical Coherence Tomography and Scheimpflug Imaging Before and After Lasik

      Abstract: Swept-source optical coherence tomography (OCT) is the latest advancement in anterior segment imaging. There are limited data regarding its performance after laser in situ keratomileusis (LASIK). We compared the reliability of swept-source OCT and Scheimpflug imaging for evaluation of corneal parameters in refractive surgery candidates with myopia or myopic astigmatism. Three consecutive measurements were obtained preoperatively and 1 year postoperatively using swept-source OCT and Scheimpflug imaging. The study parameters included central corneal thickness (CCT), thinnest corneal thickness (TCT), keratometry at steep (Ks) and flat (Kf) axes, mean keratometry (Km), and, anterior and posterior best fit spheres (Ant and Post ...

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    3. Longitudinal Evaluation of Posterior Corneal Elevation after Laser Refractive Surgery Using Swept-Source Optical Coherence Tomography

      Longitudinal Evaluation of Posterior Corneal Elevation after Laser Refractive Surgery Using Swept-Source Optical Coherence Tomography

      Purpose To investigate the change in posterior corneal elevation up to 1 year after myopic femtosecond-assisted LASIK and photorefractive keratectomy (PRK). Design Prospective, longitudinal, comparative study. Participants Patients undergoing femtosecond-assisted LASIK or PRK. Methods Corneal imaging was performed using swept-source optical coherence tomography at baseline and at each postoperative follow-up. A 2-way analysis of variance model with repeated measures and a linear mixed effect model were used to compare the differences in posterior corneal elevation between LASIK and PRK at different points after adjusting for the preoperative spherical equivalent (SEQ), central corneal thickness (CCT), thinnest corneal thickness (TCT), residual bed ...

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    4. Application of anterior segment optical coherence tomography to identify eyes with posterior polar cataract at high risk for posterior capsule rupture

      Application of anterior segment optical coherence tomography to identify eyes with posterior polar cataract at high risk for posterior capsule rupture

      Purpose To use anterior segment optical coherence tomography (AS-OCT) to identify eyes with posterior polar cataract at high risk for posterior capsule rupture (PCR) during cataract extraction. Setting Hong Kong Eye Hospital, Hong Kong, China. Design Retrospective case series. Methods Eyes with clinically diagnosed posterior polar cataract that had AS-OCT imaging and phacoemulsification were included. Each eye was graded according to the features of the posterior lens opacity and the underlying capsule. Eyes were categorized as having grade 1 or grade 2 cataract depending on the amount of clearance between the posterior opacity and the capsule (≥50% clearance and <50 ...

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    1-6 of 6
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    1. (2 articles) The Chinese University of Hong Kong
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    Application of anterior segment optical coherence tomography to identify eyes with posterior polar cataract at high risk for posterior capsule rupture Longitudinal Evaluation of Posterior Corneal Elevation after Laser Refractive Surgery Using Swept-Source Optical Coherence Tomography Longitudinal Evaluation of Cornea With Swept-Source Optical Coherence Tomography and Scheimpflug Imaging Before and After Lasik Comparison of corneal measurements in keratoconus using swept-source optical coherence tomography and combined Placido–Scheimpflug imaging Longitudinal evaluation of posterior corneal changes after LASIK in high myopia: a swept-source optical coherence tomography study Longitudinal evaluation of posterior corneal changes after laser in situ keratomileusis in high myopia: a swept‐source optical coherence tomography study Macular and choroidal perfusion using optical coherence tomography angiography in type-2 diabetic patients without diabetic retinopathy Short-term evaluation of clear corneal incision after phacoemulsification using anterior segment optical coherence tomography Evaluation of the central vault following implantable phakic contact lens and its correlation to horizontal white to white corneal diameter by anterior segment optical coherence tomography Automatic bifurcation detection utilizing pullback characteristics of bifurcation in intravascular optical coherence tomography An IoT based predictive modeling for Glaucoma detection in optical coherence tomography images using hybrid genetic algorithm The Value of Optical Coherence Tomography Angiography in Pituitary Adenomas