A 2-year longitudinal study of myopia progression and optical component changes among Hong Kong schoolchildren

Siu Yin Lam, Marion Edwards, Michel Millodot, Winnie Shuk Han Goh

Research output: Journal article publicationJournal articleAcademic researchpeer-review

119 Citations (Scopus)


This study investigated refractive error and optical component changes in a group of 142 Hong Kong schoolchildren from age 6 to 17 years over a 2- year period between 1991 and 1993. Subjects were refracted subjectively and corneal curvatures and ocular dimensions were measured. At the end of the 2- year study, the mean spherical equivalent refraction (SER) was -1.86 D (SD 1.99 D) and 62% of the schoolchildren were myopic. The annual incidence of myopia was 11.8%. Children aged 10 years and under had a greater change in SER toward myopia than older children. The annual rate of myopia progression for the myopic children was -0.46 D (SD 0.40 D) and the rate of progression was greatest between age 6 and 10 years old. Vitreous depth/axial length elongation was the main component contributing to the progression of myopia. Hong Kong schoolchildren develop myopia as early as 6 years old and myopia progresses at a greater rate compared with children of European extraction.
Original languageEnglish
Pages (from-to)370-380
Number of pages11
JournalOptometry and Vision Science
Issue number6
Publication statusPublished - 1 Jun 1999


  • Chinese
  • Myopia prevalence
  • Myopia progression
  • Optical components
  • Refraction

ASJC Scopus subject areas

  • Ophthalmology
  • Optometry

Cite this