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Dr Rachel Ka-man Chun
PolyU Scholars Hub

Dr Rachel CHUN

Research Assistant Professor

  • HJ518
  • +852 2766 4224
  • Dr Chun’s research focuses on preventing myopia, predicting its development and onset, and deciphering related pathologies through advanced imaging technologies.


Dr Rachel Chun obtained her Bachelor degree in Optometry with first class honours from The Hong Kong Polytechnic University (PolyU) in 2003. She then received a scholarship from PolyU for pursuing postgraduate study and obtained her PhD degree in 2010. Her PhD study was the role of cAMP and ApoA1 in avian eye growth using a proteomic approach. Her dissertation was designated a Distinguished Thesis by the Faculty of Health and Social Sciences of PolyU. Upon receiving her PhD, she participated in teaching as an Instructor in the School of Optometry from 2011 to 2013. Since then, she has gained clinical experience in myopia control as an Optometrist and Senior Optometrist in the PolyU Optometry Clinic. She continues to devote herself to conducting clinical studies and trials based on the knowledge gained from basic science research. In 2020, she joined the School of Optometry of PolyU as a Research Assistant Professor.

Education and Academic Qualifications

  • Bachelor of Science in Optometry, The Hong Kong Polytechnic University
  • Doctor of Philosophy, The Hong Kong Polytechnic University

Teaching Area

Research Interests

  • Prevention and prediction of myopia development
  • Mechanisms of myopia and its related ocular pathologies

Research Output

  • Choi KY*, Chun RKM*, Tang WC, To CH, Lam CS, Chan HH. Evaluation of an Optical Defocus Treatment for Myopia Progression Among Schoolchildren During the COVID-19 Pandemic. JAMA Netw Open. 2022 Jan 4;5(1):e2143781. doi: 10.1001/jamanetworkopen.2021.43781. PMID: 35029662; PMCID: PMC8760616.
    *co-first authors

  • Lam CSY, Tang WC, Tse DY, Lee RPK, Chun RKM, Hasegawa K, Qi H, Hatanaka T, To CH. Defocus Incorporated Multiple Segments (DIMS) spectacle lenses slow myopia progression: a 2-year randomised clinical trial. Br J Ophthalmol. 2020 Mar;104(3):363-368. doi: 10.1136/bjophthalmol-2018-313739. Epub 2019 May 29. PMID: 31142465; PMCID: PMC7041503.

  • Ronchetti T, Jud C, Maloca PM, Orgül S, Giger AT, Meier C, Scholl HPN, Chun RKM, Liu Q, To CH, Považay B, Cattin PC. Statistical framework for validation without ground truth of choroidal thickness changes detection. PLoS One. 2019 Jun 28;14(6):e0218776. doi: 10.1371/journal.pone.0218776. PMID: 31251762; PMCID: PMC6599222.

  • Wang D, Chun RK, Liu M, Lee RP, Sun Y, Zhang T, Lam C, Liu Q, To CH. Optical Defocus Rapidly Changes Choroidal Thickness in Schoolchildren. PLoS One. 2016 Aug 18;11(8):e0161535. doi: 10.1371/journal.pone.0161535. PMID: 27537606; PMCID: PMC4990278.

  • Chun RK, Shan SW, Lam TC, Wong CL, Li KK, Do CW, To CH. Cyclic Adenosine Monophosphate Activates Retinal Apolipoprotein A1 Expression and Inhibits Myopic Eye Growth. Invest Ophthalmol Vis Sci. 2015 Dec;56(13):8151-7. doi: 10.1167/iovs.14-14233. PMID: 26720467.
  • Does blue-light filtering spectacle lens promote myopia progression in schoolchildren? Funded by Health and Medical Research Fund (as PI)
  • Short-term effect of Defocus Incorporated Multiple Segments (DIMS) lens on choroidal thickness of schoolchildren. Funded by Collaborative Research with Hoya Lens Thailand Ltd (as PI)

  • Effectiveness of Bright Light Therapy, Myopic Defocus, Atropine and the Combinations for Controlling Myopic Eye Growth in Schoolchildren: A Randomized Control Trial. Funded by Research Impact Fund (as Co-PI)

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