October 1998
Volume 39, Issue 11
Free
Articles  |   October 1998
Influences of chorion type on saccadic eye movements in twins.
Author Affiliations
  • T Blekher
    Department of Ophthalmology, Indiana University School of Medicine, Indianapolis 46202-5175, USA.
  • J C Christian
    Department of Ophthalmology, Indiana University School of Medicine, Indianapolis 46202-5175, USA.
  • L A Abel
    Department of Ophthalmology, Indiana University School of Medicine, Indianapolis 46202-5175, USA.
  • R D Yee
    Department of Ophthalmology, Indiana University School of Medicine, Indianapolis 46202-5175, USA.
Investigative Ophthalmology & Visual Science October 1998, Vol.39, 2186-2190. doi:
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      T Blekher, J C Christian, L A Abel, R D Yee; Influences of chorion type on saccadic eye movements in twins.. Invest. Ophthalmol. Vis. Sci. 1998;39(11):2186-2190.

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Abstract

PURPOSE: The influence of genetic and prenatal environmental factors on characteristics of saccadic performance were evaluated in young monozygotic (MZ) twins (8-19 years old) of known chorion type. METHODS: Saccadic eye movements were recorded using an infrared system. Saccadic latency, accuracy, and parameters of amplitude-peak velocity exponential equation (main sequence) were quantified. RESULTS: Intraclass correlations of saccadic parameters differed significantly from zero for monochorionic and dichorionic MZ twins. The within-pair mean squares were significantly less, and intraclass correlations were significantly higher in monochorionic than in dichorionic twins for latency and were similar for other saccadic parameters (accuracy, slope of main sequence, and peak velocity for 15 degrees saccades). CONCLUSIONS: These findings confirmed previous reports that saccadic parameters of MZ twins are significantly correlated and indicated that similarity of these parameters seen in MZ twins may be driven both by genetic and by prenatal environmental factors.

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