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Br J Ophthalmol. 2018 Feb;102(2):243-247. doi: 10.1136/bjophthalmol-2017-310292. Epub 2017 Jun 12.

Environmental factors explain socioeconomic prevalence differences in myopia in 6-year-old children.

Author information

1
Department of Ophthalmology, Erasmus Medical Center, Rotterdam, The Netherlands.
2
Department of Epidemiology, Erasmus Medical Center, Rotterdam, The Netherlands.
3
Optometry & Orthoptics, University of Applied Science, Utrecht, The Netherlands.
4
Department of Paediatrics, Erasmus Medical Center, Rotterdam, The Netherlands.
5
Department of Public Health, Erasmus Medical Center, Rotterdam, The Netherlands.

Abstract

PURPOSE:

High myopia (≤-6 D) usually has its onset before 10 years of age and can lead to blinding complications later in life. We examined whether differences in myopia prevalences in socioeconomic risk groups could be explained by differences in lifestyle factors.

METHODS:

A total of 5711 six-year-old children participating in the prospective population-based birth cohort study Generation R underwent a stepwise ophthalmic examination, which included visual acuity and objective cycloplegic refraction to identify children with myopia (≤-0.5D). Daily activities, ethnicity, factors representing family socioeconomic status and housing were ascertained by questionnaire. Risk assessments of myopia and mediation analyses were performed using logistic regression; attenuation of risks was calculated by bootstrapping.

RESULTS:

Prevalence of myopia was 2.4% (n=137). Myopic children spent more time indoors and less outdoors than non-myopic children (p<0.01), had lower vitamin D (p=0.01), had a higher body mass index and participated less in sports (p=0.03). Children of non-European descent (OR 2.60; 95% CI 1.84 to 3.68), low maternal education (OR 2.27; 95% CI 1.57 to 3.28) and low family income (OR 2.62; 95% CI 1.8 to 3.74) were more often myopic. Lifestyle factors explained the majority of the increased risk for ethnicity (82%; 95% CI 55 to 120), maternal education (69%; 95% CI 45 to 109) and family socioeconomic status (71%; 95% CI 46 to 104).

CONCLUSION:

This study found environmental factors to be strong risk factors for myopia already at the age of 6 years. The myopia prevalence differences in socioeconomic groups were greatly determined by differences in distribution of these environmental risk factors, highlighting the importance of lifestyle adjustments in young children developing myopia.

KEYWORDS:

children; lifestyle; mediation; myopia

[Indexed for MEDLINE]

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