The Role of Birth Weight in Myopia – The Genes in Myopia Twin Study

Vol. 41, No. 3, 2009

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Original Paper

The Role of Birth Weight in Myopia - The Genes in Myopia Twin Study
M. Dirani^{a, b}, F.M.A. Islam^{a, b}, P.N. Baird^{a, b}

^aCentre for Eye Research Australia, University of Melbourne, Melbourne, Vic., and
^bVision Cooperative Research Centre, Sydney, N.S.W., Australia

Address of Corresponding Author

Ophthalmic Res 2009;41:154-159 (DOI: 10.1159/000209669)

Key Words

Birth weight
Myopia

Abstract

Objective: It was the aim of this study to assess the role of birth weight in the development of myopia using a large cohort of Caucasian monozygotic (MZ) and dizygotic (DZ) twins that took part in the Genes in Myopia (GEM) twin study. Methods: The recruitment of all twins in the GEM twin study was facilitated by the Australian Twin Registry. Each twin underwent a standard questionnaire and a comprehensive ocular examination, which included a dilated objective refraction through autorefraction. Myopia was defined as spherical equivalent equal to or worse than -0.50 diopters. Birth weight was determined through self-report as part of the standard questionnaire. Results: A total of 1,224 twins (690 MZ and 534 DZ twins) aged between 18 and 86 years (mean age 52.36 years) were recruited into the GEM study. The mean birth weight was similar between MZ (2.34 kg) and DZ twins (2.46 kg; p > 0.05). Logistic regression showed no significant association with birth weight and myopia for all twins (p = 0.26), as well as for MZ (p = 0.18) and DZ twins (p = 0.70) separately, with no gender effect (p = 0.23). Moreover, there was no significant difference in mean birth weight between discordant (presence/absence) MZ (myopes = 2.33 kg, non-myopes = 2.39 kg) and DZ twin pairs (myopes = 2.39 kg, non-myopes = 2.43 kg; p = 0.91 and 0.95, respectively). Conclusion: Birth weight appears to have little to no role in the development of myopia. In addition, birth weight was not a predictor of the discordance of myopia in MZ and DZ twin pairs.

Author Contacts

Mohamed Dirani, BOrth&OphthSc (Hons), PhD
Centre for Eye Research Australia
The University of Melbourne
32 Gisborne St, East Melbourne, Vic. 3002 (Australia)
Tel. +61 3 9929 8045, Fax +61 3 9662 3859, E-Mail m.dirani@pgrad.unimelb.edu.au

Article Information

Received: January 30, 2008
Accepted after revision: April 8, 2008
Published online: March 26, 2009
Number of Print Pages : 6
Number of Figures : 0, Number of Tables : 3, Number of References : 16

Medline Abstract (ID 19321937)

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