Related Experiment Videos
Impact of heredity in myopia
J M Teikari1, J O'Donnell, J Kaprio
1Department of Ophthalmology, University of California, San Francisco.
Human Heredity
|January 1, 1991
Summary
Genetic factors significantly influence myopia (nearsightedness). This study found that identical twins (monozygotic) had more similar vision than fraternal twins (dizygotic), indicating a strong hereditary component in myopia development.
Area of Science:
- Ophthalmology
- Human Genetics
- Twin Studies
Background:
- Myopia (nearsightedness) is a common refractive error with complex etiology.
- Twin studies are valuable for dissecting genetic and environmental influences on complex traits.
Purpose of the Study:
- To investigate the heritability of myopia using a twin cohort.
- To compare refractive error similarities between monozygotic and dizygotic twins.
Main Methods:
- A cohort of 109 like-sexed twin pairs (30-31 years old) from the Finnish Twin Cohort was studied.
- Refractive status was determined via spectacle prescription data.
- Analysis of variance was used to compare intrapair differences in refraction.
Main Results:
- Mean refractive differences were significantly lower in monozygotic twins (1.15-1.19 dptr) compared to dizygotic twins (2.34-2.47 dptr).
- Intrapair variances for refraction were substantially higher in dizygotic twins than in monozygotic twins.
- Heritability estimates for myopia ranged from 0.58 to 0.74, varying by sex.
Conclusions:
- Inheritance plays a substantial role in the etiology of myopia.
- Genetic factors contribute significantly to refractive error development.