Role of near work in myopia: findings in a sample of Australian school children.

Full Abstract

PURPOSE:
To examine the association of time spent in near work and reading with spherical equivalent refraction (SER) in a population-based sample of 12-year-old Australian schoolchildren.

METHODS:
Data on the time spent in near-work or outdoor activities per week and estimates for the duration of continuous reading and reading distances, were collected in questionnaires (2353 participants, 75.3% response) in the Sydney Myopia Study between 2004 and 2005; 2339 children underwent a comprehensive eye examination, including cycloplegia.

RESULTS:
Longer time spent on reading for pleasure and reports of close reading distance (< 30 cm) were associated with a more myopic refraction after adjustment for age, sex, ethnicity, and school type (P(trend) = 0.02 and P = 0.0003, respectively). Time spent in individual near-work activities, however, correlated poorly with SER (all r < or = 0.2) and was not significant in multivariate analyses for myopia (SER < or = -0.50 D), with adjustment for age, sex, ethnicity, parental myopia, school type, and outdoor activity. Children of European Caucasian ethnicity reported spending marginally less time in near work than children of East Asian ethnicity (26.0 h/wk vs. 32.5 h/wk, P < 0.0001). East Asian ethnicity, however, was associated with substantially greater odds of having myopia (odds ratio [OR], 11.0; 95% confidence interval [CI], 7.0-17.4). Near work such as close reading distance (< 30 cm) and continuous reading (> 30 minutes) independently increased the odds of having myopia in this sample of children.

CONCLUSIONS:
Although myopia was not significantly associated with time spent in near work after adjustment for other factors, there were significant independent associations with close reading distance and continuous reading. These associations may indicate that the intensity rather than the total duration of near work is an important factor.

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Author information

Author/s: Ip, Jenny M (JM); Saw, Seang-Mei (SM); Rose, Kathryn A (KA); Morgan, Ian G (IG); Kifley, Annette (A); Wang, Jie Jin (JJ); Mitchell, Paul (P);

Affiliation: Centre for Vision Research, Department of Ophthalmology and the Westmead Millennium Institute, University of Sydney, Sydney, Australia.

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't

Journal: Investigative ophthalmology & visual science (Invest Ophthalmol Vis Sci), published in United States. (Language: eng)

Reference: 2008-Jul; vol 49 (issue 7) : pp 2903-10

Dates: Created 2008/06/26; Completed 2008/07/31;

PMID: 18579757, status: MEDLINE (last retrieval date: 11/6/2008)

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MeSH headings (categories)

This article was linked to the MESH Headings shown below.

Adolescent
Asian Continental Ancestry Group - statistics & numerical data
Biometry
Child
European Continental Ancestry Group - statistics & numerical data
Eye - pathology
Family Health
Female
Humans
Male
Multivariate Analysis

Multivariate Analysis
Myopia - ethnology; etiology; pathology; physiopathology
Odds Ratio
Parents
Questionnaires
Reading
Refraction, Ocular
Schools
Sex Factors
Students
Time Factors

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