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Astigmatism in 72 twin pairs.

J M Teikari¹, J J O'Donnell

¹Department of Ophthalmology, University of California, San Francisco.

|December 1, 1989

Summary

Genetic factors do not significantly influence astigmatism. Environmental causes appear to be the primary drivers of this common vision condition, according to twin study findings.

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Area of Science:

Ophthalmology
Genetics
Twin Studies

Background:

Astigmatism is a prevalent refractive error affecting vision.
The contribution of genetic versus environmental factors to astigmatism remains debated.

Purpose of the Study:

To investigate the heritability of astigmatism using a twin study design.
To determine the relative influence of genetic and environmental factors on astigmatism development.

Main Methods:

Utilized the Finnish Twin Cohort Study, identifying 72 twin pairs (42 monozygotic, 30 dizygotic) with astigmatism.
Collected astigmatism and refractive error data from participants' eyeglass prescriptions.

Main Results:

Correlations for astigmatism were similar between monozygotic (MZ) and dizygotic (DZ) twins.
No statistically significant differences were found in the amount of astigmatism between MZ and DZ twins.

Conclusions:

Findings suggest that genetic factors play a minimal role in the development of astigmatism.
Environmental influences are likely the predominant contributors to astigmatism.

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