Abstract
Evidence of atypical perception in individuals with ASD is mainly based on self report, parental questionnaires or psychophysical/cognitive paradigms. There have been relatively few attempts to establish whether binocular vision is enhanced, intact or abnormal in those with ASD. To address this, we screened visual function in 51 individuals with autistic spectrum disorder and 44 typically developing individuals by measuring visual acuity, stereoacuity, convergence, divergence, ocular motility, incidence of strabismus and integrity of the optokinetic response. The data suggest that many aspects of vision, including visual acuity, are unaffected in ASD, but that convergence is an aspect of visual function that merits further research in those with ASD.
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Notes
The effect size r is given by
\( r = \frac{Z}{\sqrt N } \)
where Z is the test statistic obtained by Mann–Whitney analysis and N is the total number of data points. Effect sizes of .1, .3 and .5 are considered small, medium and large, respectively (Field 2005).
Because some IQ scores were missing, the data were plotted to ensure that the participants with the lowest base-out prism fusion range scores were not those who were not included in the correlation analysis with IQ. This was not the case, the base-out prism fusion range scores for the high-functioning participants who did not complete the WASI were: 25, 30 & 35 ∆.
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Acknowledgments
We thank David Burton, Bhavna Singh and Charlotte Westerman for assistance with data collection and for useful discussions about the work presented here. We are grateful to all participants, Rowan Primary School, Nook Lane Primary School, Bents Green Secondary School, Dobcroft Junior School, All Saints Catholic High School, Alderwasley Hall School, Fullerton House School and Wilsic Hall School for generously giving their time to participate in the research. This work was supported by the Economic and Social Research Council (research grant RES-000-22-1868) and has been presented in part at the following meetings: Autism Research, UK (Milton Keynes, 2007), the 8th International Congress of Autism Europe (Norway, 2007) and the XI International Orthoptic Congress (Antwerp, 2008).
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Milne, E., Griffiths, H., Buckley, D. et al. Vision in Children and Adolescents with Autistic Spectrum Disorder: Evidence for Reduced Convergence. J Autism Dev Disord 39, 965–975 (2009). https://doi.org/10.1007/s10803-009-0705-8
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DOI: https://doi.org/10.1007/s10803-009-0705-8