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(Investigative Ophthalmology and Visual Science. 2001;42:1232-1236.)
© 2001 by The Association for Research in Vision and Ophthalmology, Inc.

Genes and Environment in Refractive Error: The Twin Eye Study

Christopher J. Hammond1,2, Harold Snieder1, Clare E. Gilbert2 and Tim D. Spector1

1 From the Twin Research and Genetic Epidemiology Unit, St. Thomas’ Hospital; and 2 Department of Preventive Ophthalmology, Institute of Ophthalmology, London, United Kingdom.

PURPOSE. A classical twin study was performed to examine the relative importance of genes and environment in refractive error.

METHODS. Refractive error was examined in 226 monozygotic (MZ) and 280 dizygotic (DZ) twin pairs aged 49 to 79 years (mean age, 62.4 years). Using a Humphrey-670 automatic refractor, continuous measures of spherical equivalent, total astigmatism, and corneal astigmatism were recorded. Univariate and bivariate maximum likelihood model fitting was used to estimate genetic and environmental variance components using information from both eyes.

RESULTS. For the continuous spectrum of myopia/hyperopia, a model specifying additive genetic and unique environmental factors showed the best fit to the data, yielding a heritability of 84% to 86% (95% confidence interval [CI], 81%–89%). If myopia and hyperopia (<= -0.5 D and >= 0.5 D, respectively) were treated as binary traits, the heritability was 90% (95% CI, 81%–95%) for myopia and 89% (95% CI, 81%–94%) for hyperopia. For total and corneal astigmatism, modeling showed dominant genetic effects are important; dominant genetic effects accounted for 47% to 49% of the variance of total astigmatism (95% CI, 37%–55%) and 42% to 61% of corneal astigmatism variance (95% CI, 8%–71%), with additive genetic factors accounting for 1% to 4% and 4% to 18%, respectively (95% CIs, 0%–13% and 0%–60%, respectively).

CONCLUSIONS. Genetic effects are of major importance in myopia/hyperopia; astigmatism appears to be dominantly inherited.




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