Prevalence of myopia among Hong Kong Chinese schoolchildren: changes over two decades
Open Access
- 12 December 2011
- journal article
- Published by Wiley in Ophthalmic and Physiological Optics
- Vol. 32 (1), 17-24
- https://doi.org/10.1111/j.1475-1313.2011.00886.x
Abstract
Citation information: Lam CS-Y, Lam 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 of myopia among urbanized Asian countries over recent decades. In the early 1990s, the reported prevalence rate was 25% and 64% for 6 and 12 year old children respectively. This cross-sectional study aims to determine the current prevalence of myopia amongst Hong Kong Chinese schoolchildren and whether there has been any increase over the last two decades. Methods: Data from 2651 children aged 6–12 (mean age: 8.92 ± 1.77, 53% boys) who participated in vision screening during 2005–2010 were analyzed. Visual parameters including visual acuity (in logMAR) and binocular status under the participants’ habitual correction were assessed. Refractive errors were examined using non-cycloplegic auto-refraction and axial lengths were measured by partial coherence interferometry. Results: The mean spherical equivalent refraction for this population was −1.02 ± 1.70D, ranging from +4.75 to −10.00D. Prevalence of myopia (more than −0.50D) was 18.3% for the 6-year-old group and 61.5% for the 12-year-old group. Average myopia magnitude was −0.06 ± 1.03D at age 6 and −1.67 ± 1.99D at age 12. Prevalence of high myopia of more than −6.00D was 1.8%, with an increase from 0.7% at the age of 6 to 3.8% at the age of 12. Conclusions: The prevalence of myopia among the Chinese schoolchildren population in Hong Kong as observed in this cross-sectional study are similar to our previously reported findings from almost two decades ago. There is no evidence that prevalence of myopia is increasing with time over the last two decades. However, the prevalence and degree of myopia in Chinese children is high as compared with other ethnic groups such as those reported among Caucasians.Keywords
This publication has 29 references indexed in Scilit:
- Comparing myopic progression of urban and rural Taiwanese schoolchildrenJapanese Journal of Ophthalmology, 2010
- Refractive error and visual impairment in school children in Northern IrelandBritish Journal of Ophthalmology, 2010
- Ethnicity-specific prevalences of refractive errors vary in Asian children in neighbouring Malaysia and SingaporeBritish Journal of Ophthalmology, 2006
- Refractive Error and Visual Impairment in School-Age Children in Gombak District, MalaysiaOphthalmology, 2005
- Spectacle use and reduced unaided vision in third grade students: a comparative study in different educational settingsClinical and Experimental Optometry, 2004
- Clinical evaluation of the Shin‐Nippon SRW‐5000 autorefractor in adultsOphthalmic and Physiological Optics, 2001
- Clinical evaluation of the Shin‐Nippon SRW‐5000 autorefractor in childrenOphthalmic and Physiological Optics, 2001
- A visual survey of school children in Hong KongClinical and Experimental Optometry, 1993
- Refractive plasticity of the developing chick eyeOphthalmic and Physiological Optics, 1992
- The incidence of refractive errors among school children in Hong Kong and its relationship with the optical componentsClinical and Experimental Optometry, 1991