Environmental and Genetic Factors Explain Differences in Intraocular Scattering
| Autor: | Juan F. Sánchez-Romera, Lucia Hervella, Juan R. Ordoñana, Juan Tabernero, Marcos Ruiz-Sánchez, Pablo Artal, Antonio Benito, Harilaos Ginis, José María Marín, Alexandros Pennos |
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| Rok vydání: | 2016 |
| Předmět: |
Adult
Male 0301 basic medicine medicine.medical_specialty Corneal Wavefront Aberration Visual acuity Light genetic structures Intraclass correlation Biology 03 medical and health sciences 0302 clinical medicine Ocular straylight Ophthalmology Genetic model Diseases in Twins Twins Dizygotic medicine Humans Scattering Radiation Gene–environment interaction Scattering Twins Monozygotic Middle Aged Heritability Twin study eye diseases 030104 developmental biology 030221 ophthalmology & optometry Female Gene-Environment Interaction medicine.symptom |
| Zdroj: | Investigative Opthalmology & Visual Science. 57:163 |
| ISSN: | 1552-5783 |
| DOI: | 10.1167/iovs.15-17897 |
| Popis: | PURPOSE To study the relative impact of genetic and environmental factors on the variability of intraocular scattering within a classical twin study. METHODS A total of 64 twin pairs, 32 monozygotic (MZ) (mean age: 54.9 ± 6.3 years) and 32 dizygotic (DZ) (mean age: 56.4 ± 7.0 years), were measured after a complete ophthalmologic exam had been performed to exclude all ocular pathologies that increase intraocular scatter as cataracts. Intraocular scattering was evaluated by using two different techniques based on a straylight parameter log(S) estimation: a compact optical instrument based in the principle of optical integration and a psychophysical measurement. Intraclass correlation coefficients (ICC) were used as descriptive statistics of twin resemblance, and genetic models were fitted to estimate heritability. RESULTS No statistically significant difference was found for MZ and DZ groups for age (P = 0.203), best-corrected visual acuity (P = 0.626), cataract gradation (P = 0.701), sex (P = 0.941), optical log(S) (P = 0.386), or psychophysical log(S) (P = 0.568), with only a minor difference in equivalent sphere (P = 0.008). Intraclass correlation coefficients between siblings were similar for scatter parameters: 0.676 in MZ and 0.471 in DZ twins for optical log(S); 0.533 in MZ twins and 0.475 in DZ twins for psychophysical log(S). For equivalent sphere, ICCs were 0.767 in MZ and 0.228 in DZ twins. Conservative estimates of heritability for the measured scattering parameters were 0.39 and 0.20, respectively. CONCLUSIONS Correlations of intraocular scatter (straylight) parameters in the groups of identical and nonidentical twins were similar. Heritability estimates were of limited magnitude, suggesting that genetic and environmental factors determine the variance of ocular straylight in healthy middle-aged adults. |
| Databáze: | OpenAIRE |
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