1. Hong Kong Polytechnic University

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    1. Mentioned In 17 Articles

    2. Effect of caffeine on superficial retinal vasculature of the macula in high myopes using optical coherence tomography angiography - A pilot study

      Effect of caffeine on superficial retinal vasculature of the macula in high myopes using optical coherence tomography angiography - A pilot study
      Purpose: To monitor effect of caffeine on vasculature of the inner retina of high myopes METHODS: This was a crossover, self-control, randomized trial. Healthy young high myopes were recruited to take 200 mg of caffeine capsule and placebo capsule, randomly assigned in two visits separated by at least one week. Superficial retinal vasculature in terms of vessel length density (VD) and perfusion area density (PD) was captured and monitored using ...
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    3. Fourier Domain Mode Locked Laser and Its Applications

      Fourier Domain Mode Locked Laser and Its Applications
      The sweep rate of conventional short-cavity lasers with an intracavity-swept filter is limited by the buildup time of laser signals from spontaneous emissions. The Fourier domain mode-locked (FDML) laser was proposed to overcome the limitations of buildup time by inserting a long fiber delay in the cavity to store the whole swept signal and has attracted much interest in both theoretical and experimental studies. In this review, the theoretical models ...
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    4. Fixation Stability and Deviation in Optical Coherence Tomography Angiography Using Soft Contact Lens Correction in Myopes

      Fixation Stability and Deviation in Optical Coherence Tomography Angiography Using Soft Contact Lens Correction in Myopes
      Objective To compare fixation deviation and stability with soft contact lens correction and device built-in auto-focus system during optical coherence tomography angiography (OCTA). Methods This observational study measured OCTA metrics first with contact lens correction, followed by removal of contact lenses, using the device auto-focus system at a University Optometry Clinic, Hong Kong. All participants were habitual soft contact lens wearers with either low or high myopia. OCTA measurements were ...
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    5. Multiple scan averaging to yield accurate quantitative analysis of optical coherence tomography angiograms

      Multiple scan averaging to yield accurate quantitative analysis of optical coherence tomography angiograms
      Optical coherence tomography angiography (OCTA) is widely used in ophthalmic practice. Most OCTA studies based their findings on a single OCTA measurement. We conducted an observational study of 82 eyes from 82 healthy subjects to compare variations of OCTA parameters among five successive measurements. A 33mm Early Treatment of Diabetic Retinopathy Study grid centred at fovea was used. An average from five successive OCTA measurements (both perfusion density and vessel ...
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    6. Comparison of Choroidal Thickness Measurements Using Semiautomated and Manual Segmentation Methods

      Comparison of Choroidal Thickness Measurements Using Semiautomated and Manual Segmentation Methods
      SIGNIFICANCE This study demonstrated that a semiautomated segmentation method could help inexperienced practitioners to obtain choroidal thickness as good as experienced practitioners. PURPOSE The purpose of this study was to compare choroidal thickness measurements obtained by semiautomated and manual segmentation methods. METHODS Optical coherence tomography images of 37 eyes from 37 healthy young subjects acquired by a spectral-domain optical coherence tomography device were reviewed retrospectively. Two naive examiners measured choroidal ...
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    7. Automatic quantification of superficial foveal avascular zone in optical coherence tomography angiography implemented with deep learning

      Automatic quantification of superficial foveal avascular zone in optical coherence tomography angiography implemented with deep learning
      An accurate segmentation and quantification of the superficial foveal avascular zone (sFAZ) is important to facilitate the diagnosis and treatment of many retinal diseases, such as diabetic retinopathy and retinal vein occlusion. We proposed a method based on deep learning for the automatic segmentation and quantification of the sFAZ in optical coherence tomography angiography (OCTA) images with robustness to brightness and contrast (B/C) variations. A dataset of 405 OCTA ...
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    8. Assessment of Corneal Biomechanical Properties with Inflation Test Using Optical Coherence Tomography

      Assessment of Corneal Biomechanical Properties with Inflation Test Using Optical Coherence Tomography
      Biomechanical properties are important for the cornea to maintain its normal shape and function. There is still a need to develop better methods for accurate measurement of corneal mechanical properties. In this study, we propose to introduce the optical coherence tomography (OCT) in inflation test for the imaging of corneal deformation in order to measure its biomechanical properties. Ten cornea-mimicking silicone phantoms with different stiffness and five fresh porcine corneas ...
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    9. Eckhaus Instability in the Fourier-Domain Mode Locked Fiber Laser Cavity

      Eckhaus Instability in the Fourier-Domain Mode Locked Fiber Laser Cavity
      High frequency fluctuation in the optical signal generated in Fourier-Domain Mode Locked fiber laser (FDML-FL), which is the major problem and degrades the laser performance, is not yet fully analyzed or studied. The basic theory which is causing this high frequency fluctuation is required to clearly understand its dynamics and to control it for various applications. In this letter, by analyzing the signal and system dynamics of FDML-FL, we theoretically ...
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    10. Measurement of diabetic wounds with optical coherence tomography-based air-jet indentation system and a material testing system

      Measurement of diabetic wounds with optical coherence tomography-based air-jet indentation system and a material testing system
      Objective: Material testing system is a conventional but destructive method for measuring the biomechanical properties of wound tissues in basic research. The recently developed optical coherence tomography-based air-jet indentation system is a non-destructive method for measuring these properties of soft tissues in a non-contact manner. The aim of the study was to examine the correlation between the biomechanical properties of wound tissues measured by the two systems. Method: Young male ...
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    11. An OCT-based air suction-indentation probe for tissue elasticity measurement

      An OCT-based air suction-indentation probe for tissue elasticity measurement
      In this study, we developed a miniaturized optical coherence tomography (OCT) probe with a diameter of 4 mm. It was integrated with an air-jet indentation and air suction to induce deformation of tissue. The deforming process of tissue under suction or indentation was continuously monitored by OCT, and deformation of tissue was then derived from the transient OCT signals. Studies on phantoms with different stiffness were conducted. Results showed that ...
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    12. Effects of scan circle displacement in optical coherence tomography retinal nerve fibre layer thickness measurement: a RNFL modelling study

      ... Visual Sciences, The Chinese University of Hong Kong, Hong Kong, PRC 2. ^2Department of Applied Mathematics, Hong Kong Polytechnic University, Hong Kong, PRC 3. ^3Hamilton Glaucoma Center, Department of Ophthalmology, U...
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  2. About Hong Kong Polytechnic University

    Hong Kong Polytechnic University

    Hong Kong Polytechnic University (PolyU) specializes in professional education in Hong Kong. The University’s teaching units are grouped under six faculties and two schools; the Faculty of Applied Science and Textiles, Faculty of Business, Faculty of Construction and Land Use, Faculty of Engineering, Faculty of Health and Social Sciences, Faculty of Humanities, alongside with School of Design and School of Hotel and Tourism Management