A5082862969- Ophthalmology and Visual Impairment Studies
- Corneal surgery and disorders
- Retinal Diseases and Treatments
- Glaucoma and retinal disorders
- Visual perception and processing mechanisms
- Ocular Surface and Contact Lens
- Ophthalmology and Visual Health Research
- Retinal Imaging and Analysis
- Retinopathy of Prematurity Studies
- Ocular Infections and Treatments
- Ergonomics and Musculoskeletal Disorders
- Intraocular Surgery and Lenses
- Reading and Literacy Development
- Writing and Handwriting Education
- Retinal and Optic Conditions
- Optical Systems and Laser Technology
- Cerebral Venous Sinus Thrombosis
- Optical Coherence Tomography Applications
- Ocular and Laser Science Research
- Anatomy and Medical Technology
- Digital Accessibility for Disabilities
- Human Health and Disease
- melanin and skin pigmentation
- Human Resources and Workforce
- Assistive Technology in Communication and Mobility
Hong Kong Polytechnic University
2016-2025
Hong Kong Eye Hospital
2022-2025
University of Waterloo
2024-2025
University of Chicago
2024
Columbia University Irving Medical Center
2024
University of Toronto
2023
Hospital for Sick Children
2023
SickKids Foundation
2023
Westminster College - Pennsylvania
2018
Skyworks Solutions (United States)
2017
Aim To determine if ‘Defocus Incorporated Multiple Segments’ (DIMS) spectacle lenses slow childhood myopia progression. Methods A 2-year double-masked randomised controlled trial was carried out in 183 Chinese children aged 8–13 years, with between −1.00 and −5.00 D astigmatism ≤1.50 D. Children were randomly assigned to wear DIMS (n=93) or single vision (SV) (n=90). lens incorporated multiple segments myopic defocus of +3.50 Refractive error (cycloplegic autorefraction) axial length...
<h3>Aims</h3> To determine if 'Defocus Incorporated Soft Contact' (DISC) lens wear slows childhood myopia progression. <h3>Methods</h3> A 2-year double-blind randomised controlled trial was carried out in 221 children aged 8–13 years, with between −1.00 and −5.00 Dioptres (D) astigmatism ≤1.00 D. Subjects were randomly assigned to the DISC (n=111) or single vision (SV; n=110) contact group. lenses incorporated concentric rings, which provided an addition of +2.50 D, alternating normal...
Aims To determine myopia progression in children who continued to wear the defocus incorporated multiple segments (DIMS) lenses or switched from single vision (SV) DIMS for a 1-year period following 2-year control trial. Methods 128 participated this study. The had worn (DIMS group), and SV (Control-to-DIMS group). Cycloplegic spherical equivalent refraction (SER) axial length (AL) were measured at 6-month interval. Historical controls age matched group 24 months used comparing third-year...
Abstract This study evaluated the long-term myopia control effect and safety in children wearing Defocus Incorporated Multiple Segments (DIMS) spectacle lenses. Participants who completed 2-year RCT were followed for a total of 6 years; their cycloplegic refractions axial length measured. Group 1 (n = 36) wore DIMS spectacles 2 14) lens first 3.5 years SV afterwards; 3 22) switched to DIMS; 4 18) years, 1.5 then again. showed no significant differences progression (− 0.52 ± 0.66 vs. − 0.40...
A direct-conversion ultra-wideband (UWB) transceiver for Mode 1 OFDM applications employs three resonant networks and phase-locked loops. Using a common-gate input stage, the receiver allows direct sharing of antenna with transmitter. Designed in 0.13-/spl mu/m CMOS technology, provides total gain 69-73 dB noise figure 6.5-8.4 across bands, TX 1-dB compression point -10 dBm. The circuit consumes 105 mW from 1.5-V supply.
This study had three main goals: to assess the degree of suppression in patients with strabismic, anisometropic, and mixed amblyopia; establish relationship between compare across clinical subgroups within sample.Using both standard measures (Bagolini lenses neutral density [ND] filters, Worth 4-Dot test) a new approach involving measurement dichoptic motion thresholds under conditions variable interocular contrast, 43 amblyopic strabismus, anisometropia, or combination was quantified.There...
Citation information: Lam CS‐Y, C‐H, Cheng SC‐K & Chan LY‐L. Prevalence of myopia among Hong Kong Chinese schoolchildren: changes over two decades. Ophthalmic Physiol Opt 2012, 32, 17‐24. doi: 10.1111/j.1475‐1313.2011.00886.x Abstract Purpose: Studies have documented an increasing prevalence urbanized Asian countries recent In the early 1990s, reported rate was 25% and 64% for 6 12 year old children respectively. This cross‐sectional study aims to determine current amongst schoolchildren...
Purpose. This study aims to investigate genetic and environmental influences on physiological myopia by studying the difference in prevalence between local schools international Hong Kong. Methods. Vision screening was carried out for students 13 15 years old. Types of refractive error were identified visual acuity measurement, presence spectacles, a simple refraction, use plus minus ophthalmic lenses. Results. Three six participated study. Two hundred eighty-nine from schools, 789 schools....
<h3>Importance</h3> Binocular amblyopia treatment using contrast-rebalanced stimuli showed promise in laboratory studies and requires clinical trial investigation a home-based setting. <h3>Objective</h3> To compare the effectiveness of binocular video game with placebo for improving visual functions older children adults. <h3>Design, Setting, Participants</h3> The Treatment Amblyopia Using Videogames was multicenter, double-masked, randomized trial. Between March 2014 June 2016, 115...
Purpose: To compare changes in relative peripheral refraction (RPR) associated with myopia progression myopic children wearing Defocus Incorporated Multiple Segments (DIMS) lenses and single vision (SV) spectacle over 2 years. Methods: A 2-year double-blind, randomized controlled trial was conducted on 183 children. Subjects were allocated to either DIMS (n = 93) or SV 90). Peripheral at 10°, 20°, 30° of the nasal (10N, 20N, 30N) temporal (10T, 20T, 30T) retinal eccentricities, central...
The age trends of refractive errors, astigmatism and optical components were studied in 220 Chinese subjects aged over 40 years. Myopia did not dominate this group. With increasing age, the prevalence hyperopia increases from 2% at 40–45 years to 66% > 65 Against‐the‐rule was more prevalent than other types. Significant correlations found between spherical equivalent power, vitreous depth axial length. Sex differences among but error. appears be younger groups older Hong Kong population,...
This study investigated refractive error and optical component changes in a group of 142 Hong Kong schoolchildren from age 6 to 17 years over 2-year period between 1991 1993. Subjects were refracted subjectively corneal curvatures ocular dimensions measured. At the end study, mean spherical equivalent refraction (SER) was -1.86 D (SD 1.99 D) 62% myopic. The annual incidence myopia 11.8%. Children aged 10 under had greater change SER toward than older children. rate progression for myopic...
Although eye dominance assessment is used to assist clinical decision-making, current understanding limited by inconsistencies across the range of available tests. A new psychophysical test sensory has been developed that objectively measures relative contribution each a fused suprathreshold binocular percept.Six standard tests and newly were measure motor in group 44 binocularly normal individuals (mean age, 29.5 ± 9.10 years). The required observers perform motion coherence task under...
Purpose: To compare visual function of myopic children who had worn either defocus incorporated multiple segment (DIMS) spectacle lenses or single vision (SV) over two years. Methods: We included 160 Chinese (−1 diopter [D] to −5 D) aged 8 13 years in a randomized clinical trial; they wore DIMS (DIMS; n = 79) regular SV spectacles (n 81) full time for 2 Visual function, including high-contrast acuity (VA) and low-contrast VA at distance near, binocular functions, accommodation, before,...
The aim of this study is to investigate if baseline relative peripheral refraction (RPR) influences the myopia control effects in Chinese myopic children wearing Defocus Incorporated Multiple Segments (DIMS) lenses. Peripheral at 10°, 20°, and 30° nasal (10 N, 20 30 N) temporal T, T) retina were measured six-month intervals for who participated a 2-year randomized controlled trial. relationship between refractions progression axial length changes analysed. A total 79 81 DIMS single vision...
<h3>Importance</h3> Myopia progression has been found to be worsening during the COVID-19 pandemic. It is important control rapid myopia in this period. <h3>Objective</h3> To analyze association of COVID-19–related lockdown measures with schoolchildren and compare performance defocus incorporated multiple segments (DIMS) lens that single vision (SVL) treatment reducing progression. <h3>Design, Setting, Participants</h3> This cohort study involved an exploratory, prespecified, comparison 2...
Myopia control interventions, such as defocus incorporated multiple segments (DIMS) spectacle lenses, have been adopted in school-aged children to reduce the prevalence of myopia and its complications. This study aimed investigate effect DIMS lenses on subfoveal choroidal thickness (SfChT) over a period two years, response myopic is crucial factor exploring potential predicting progression.This involved secondary analysis our previous randomized clinical trial. Myopic aged 8-13 years were...
AbstractPurpose. The aims of this study were to investigate the effect age, intraocular pressure, refractive error (spherical equivalent) and corneal curvatures on central thickness Hong Kong-Chinese. We also compared Kong-Chinese with those previously reported for other national/ethnic groups. Methods. thicknesses 151 subjects age 10–60 yrs measured using an ultrasound pachometer. Intraocular these recorded. Results. mean ± SD right eye left 575 32 mm 574 31 respectively. No significant...
The distribution of refractive errors and its relationship to the optical components in 105 Hong Kong Chinese aged 19–39 years was studied. Myopia most frequent (71%) this population. mean spherical equivalent ‐3.00 DS. trend changes direction corneal astigmatism from with‐the‐rule against‐the‐rule with increasing age shown. Significant correlations were found between anterior segment distance. Ultrasound examination showed that an axial length associated higher myopia. Men had flatter...
Introduction: The prevalence of myopia amongst the Chinese has escalated in recent decades. While this refractive error was previously a little more than an inconvenience and source unwanted expense to affected individuals, it is now sufficiently prevalent warrant national concern. Myopia also major cause low vision. This review aims provide information on community Hong Kong. Materials Methods: Based number studies carried out mainly at Centre for Research Kong Polytechnic University,...
AbstractThis study aims to provide information about the prevalence of refractive errors among Chinese school children in Hong Kong, and its relationship with optical components eye. Subjective refraction, corneal curvatures ocular biometry were performed on 383 from age six 17 years.The myopia increases 30 per cent at seven 50 (girls) 70 (boys) 16–17. The mean spherical equivalent refraction gradually changes plano ‐2.00 D 1617. Our results are different Caucasian data but comparable those...
To determine the effects of simultaneously presented myopic and hyperopic defocus on refractive development chicks.A novel form dual-power lens was designed. Normal chicks 7 to 8 days age were fitted with a over one eye plano fellow (control) eye. Dual-power lenses +20/-10, +10/-10, +5/-10, plano/-10-D tested, along +10/-10-D having differing ratios (50:50, 33:67, 25:75) surface area devoted each power. Ocular refraction axial ocular component dimensions assessed after 6 wear, by retinoscopy...
Eye growth compensates in opposite directions to single vision (SV) negative and positive lenses. We evaluated the response of guinea pig eye Fresnel-type lenses incorporating two different powers.A total 114 pigs (10 groups with 9-14 each) wore a lens over one interocular differences refractive error ocular dimensions were measured each three experiments. First, effects Fresnel designs various diopter (D) combinations (-5D/0D; +5D/0D or -5D/+5D dual power) compared SV (-5D, +5D, 0D)....