Dataset Information

Time outdoors and physical activity as predictors of incident myopia in childhood: a prospective cohort study.

ABSTRACT:

Purpose

Time spent in "sports/outdoor activity" has shown a negative association with incident myopia during childhood. We investigated the association of incident myopia with time spent outdoors and physical activity separately.

Methods

Participants in the Avon Longitudinal Study of Parents and Children (ALSPAC) were assessed by noncycloplegic autorefraction at ages 7, 10, 11, 12, and 15 years, and classified as myopic (?-1 diopters) or as emmetropic/hyperopic (?-0.25 diopters) at each visit (N = 4,837-7,747). Physical activity at age 11 years was measured objectively using an accelerometer, worn for 1 week. Time spent outdoors was assessed via a parental questionnaire administered when children were aged 8-9 years. Variables associated with incident myopia were examined using Cox regression.

Results

In analyses using all available data, both time spent outdoors and physical activity were associated with incident myopia, with time outdoors having the larger effect. The results were similar for analyses restricted to children classified as either nonmyopic or emmetropic/hyperopic at age 11 years. Thus, for children nonmyopic at age 11, the hazard ratio (95% confidence interval, CI) for incident myopia was 0.66 (0.47-0.93) for a high versus low amount of time spent outdoors, and 0.87 (0.76-0.99) per unit standard deviation above average increase in moderate/vigorous physical activity.

Conclusion

Time spent outdoors was predictive of incident myopia independently of physical activity level. The greater association observed for time outdoors suggests that the previously reported link between "sports/outdoor activity" and incident myopia is due mainly to its capture of information relating to time outdoors rather than physical activity.

SUBMITTER: Guggenheim JA

PROVIDER: S-EPMC3367471 | biostudies-literature | 2012 May

REPOSITORIES: biostudies-literature

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Publications

Time outdoors and physical activity as predictors of incident myopia in childhood: a prospective cohort study.

Guggenheim Jeremy A JA Northstone Kate K McMahon George G Ness Andy R AR Deere Kevin K Mattocks Calum C Pourcain Beate St BS Williams Cathy C

Investigative ophthalmology & visual science 20120514 6

<h4>Purpose</h4>Time spent in "sports/outdoor activity" has shown a negative association with incident myopia during childhood. We investigated the association of incident myopia with time spent outdoors and physical activity separately.<h4>Methods</h4>Participants in the Avon Longitudinal Study of Parents and Children (ALSPAC) were assessed by noncycloplegic autorefraction at ages 7, 10, 11, 12, and 15 years, and classified as myopic (≤-1 diopters) or as emmetropic/hyperopic (≥-0.25 diopters) a ...[more]

PMID: 22491403

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Dataset Information

Time outdoors and physical activity as predictors of incident myopia in childhood: a prospective cohort study.

Purpose

Methods

Results

Conclusion

Publications

Time outdoors and physical activity as predictors of incident myopia in childhood: a prospective cohort study.

Similar Datasets

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