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Optom Vis Sci. 1999 Jun;76(6):370-80.

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

Author information

1
Department of Optometry and Radiography, The Hong Kong Polytechnic University, Hung Hom, Kowloon. orcarly@polyu.edu.hk

Abstract

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.

PMID:
10416931
[Indexed for MEDLINE]

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