Abstract:
PURPOSE:To examine the heritability of corneal refraction power (CR) and corneal astigmatism (AST) in older women. METHODS:Corneal refraction and AST were measured by IOL master in 52 monozygotic (MZ) and 47 dizygotic (DZ) female twin pairs aged 66-79 years. The relative contribution of genetic and environmental factors to individual differences in CR was estimated by applying an independent pathway model to the twin data and AST by intraclass correlations (ICC). RESULTS:For the right eye, mean CR was 44.58 dioptres (D) (standard deviation (SD) ±1.28) When comparing CR of the right and left eye between MZ and DZ, no significant difference was found. Mean AST was 0.77 D (SD ±0.44) with no differences observed either between the MZ and the DZ individuals, or between the left and the right eyes. ICCs between the sisters for CR were, for the right eye, 0.882 and 0.378 for MZ and DZ, respectively, and for the left eye 0.855 and 0.358. For AST of the right eye, the ICCs were 0.533 and 0.096 for the MZ and DZ pairs, respectively, and for the left eye, the MZ and DZ correlations were 0.396 and 0.299. Quantitative genetic modelling showed that 81% of the variance in CR could be explained by genetic factors, additive genetic factors explaining 62% (95% confidence interval [CI] 44% -86%) and dominant genetic effect 19% (95% CI 7-49%) of the variance in CR. Different models were constructed to explain the heredity of AST. None of these models gave meaningful results, although the ICC values for MZ were higher than those for DZ. CONCLUSIONS:Most of the variance in CR among older Finnish women could be explained by genetic factors.
journal_name
Acta Ophthalmoljournal_title
Acta ophthalmologicaauthors
Pärssinen O,Kauppinen M,Kaprio J,Koskenvuo M,Rantanen Tdoi
10.1111/j.1755-3768.2011.02332.xsubject
Has Abstractpub_date
2013-03-01 00:00:00pages
140-4issue
2eissn
1755-375Xissn
1755-3768journal_volume
91pub_type
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