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Chi-ho TO

Visiting Chair Professor of Experimental Optometry


Professor Chi-ho TO graduated in Optometry at the Hong Kong Polytechnic in 1987. He obtained his PhD degree from the University of Wales, College of Cardiff, United Kingdom. In 1993, he returned to the Hong Kong Polytechnic, working as a Lecturer. In 2019, Professor To was promoted to Chair Professor. He has supervised or co-supervised numerous Masters and Doctoral theses since 1994.

Professor To is one of the inventors of Defocus Incorporated Soft Contact (DISC) lens and Defocus Incorporated Multiple Segment (DIMS) lens. The DISC lens won the Grand Prize and Gold Medal with Jury’s Commendation at the 39th International Exhibition of Inventions of Geneva in 2011. The DIMS lens also won the Grand Prize, Grand Award and Gold Medal, as well as the Congratulations of the Jury at the 46th International Exhibition in 2018.

Professor To is an Honorary Member of the Hong Kong Association of Private Practice Optometrists. He is also a Member of Scientific and Medical Advisory Board of Retina Hong Kong.

Education and Academic Qualifications

  • Professional Diploma in Optometry, Hong Kong Polytechnic
  • Doctor of Philosophy, University of Wales

Research Interests

  • Aqueous humour physiology
  • Glaucoma
  • Myopia basic mechanism and treatment
  • Retinal degenerations
  • Proteomics

Research Output

  1. 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. Wedrich A, ed. PLoS One. 2016;11(8):e0161535.
  2. Arumugam B, Hung LF, Huang J, To CH, Holden BA, Smith EL III. (2014) The effects of simultaneous dual focus lenses on refractive development in infant monkeys. Invest Ophthalmol Vis Sci. 55:7423-7432.
  3. Wang JC, Chun RKM, Zhou YY, Zuo B, Li KK, Liu Q, To CH. Both the central and peripheral retina contribute to myopia development in chicks. Ophthalmic Physiol Opt 2015; 35: 652–662.
  4. McFadden SA, Tse DY, Bowrey HE, Leotta AJ, Lam CS, Wildsoet CF, To CH. Integration of Defocus by Dual Power Fresnel Lenses Inhibits Myopia in the Mammalian Eye. Invest. Ophthalmol Vis Sci. 2014;55(2):908-917.

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