Encyclopedia of Autism Spectrum Disorders

2013 Edition
| Editors: Fred R. Volkmar

Acuity

  • Armando Bertone
Reference work entry
DOI: https://doi.org/10.1007/978-1-4419-1698-3_1345

Definition

Given that detailed or locally oriented perception is a central tenet of visual cognition in autism (Behrmann, Thomas, & Humphreys, 2006; Dakin & Frith, 2005; Mottron, Dawson, Soulieres, Hubert, & Burack, 2006), several studies have systematically assessed the spatial resolution of vision in autism by measuring visual acuity (VA). VA is generally defined as the ability to perceive targets such as optotypes, letters, or numbers of a specific size at a given distance. For example, “normal” Snellen VA, often referred to as 20/20 vision, is a clinical term that reflects a person’s ability to recognize a target (i.e., letter E) from 20 ft away when its defining spatial features (i.e., spacing of lines composing an E target) are separated by a visual angle of 1 arc minute.

Several studies have assessed VA in ASD using a variety of clinical screening charts. For the most part, VA has been demonstrated to be unremarkable in ASD when assessed with either the Crowded LogMAR test...

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References and Readings

  1. Ashwin, E., Ashwin, C., Rhydderch, D., Howells, J., & Baron-Cohen, S. (2009). Eagle-eyed visual acuity: An experimental investigation of enhanced perception in autism. Biological Psychiatry, 65, 17–21.PubMedGoogle Scholar
  2. Bach, M., & Dakin, S. C. (2009). Regarding “Eagle-eyed visual acuity: An experimental investigation of enhanced perception in autism”. Biological Psychiatry, 66, e19–e20. author reply e23–14.PubMedGoogle Scholar
  3. Behrmann, M., Thomas, C., & Humphreys, K. (2006). Seeing it differently: Visual processing in autism. Trends in Cognitive Sciences, 10(6), 258–264.PubMedGoogle Scholar
  4. Crewther, D. P., & Sutherland, A. (2009). The more he looked inside, the more piglet wasn’t there: Is autism really blessed with visual hyperacuity? Biological Psychiatry, 66, e21–e22. author reply e23-24.PubMedGoogle Scholar
  5. Dakin, S., & Frith, U. (2005). Vagaries of visual perception in autism. Neuron, 48(3), 497–507.PubMedGoogle Scholar
  6. de Jonge, M. V., Kemner, C., de Haan, E. H., Coppens, J. E., van den Berg, T. J., & van Engeland, H. (2007). Visual information processing in high-functioning individuals with autism spectrum disorders and their parents. Neuropsychology, 21, 65–73.PubMedGoogle Scholar
  7. Falkmer, M., Stuart, G. W., Danielsson, H., Bram, S., Lönebrink, M., & Falkmer, T. (2011). Visual acuity in adults with Asperger’s syndrome: No evidence for “eagle-eyed” vision. Biological Psychiatry, 70, 812–816.PubMedGoogle Scholar
  8. Jemel, B., Mimeault, D., Saint-Amour, D., Hosein, A., & Mottron, L. (2010). VEP contrast sensitivity responses reveal reduced functional segregation of mid and high filters of visual channels in autism. Journal of Vision, 10(6), 13.PubMedGoogle Scholar
  9. Keita, L., Mottron, L., & Bertone, A. (2010). Far visual acuity is unremarkable in autism: Do we need to focus on crowding? Autism Research, 3, 333–341.PubMedGoogle Scholar
  10. Koh, H. C., Milne, E., & Dobkins, K. (2010). Spatial contrast sensitivity in adolescents with autism spectrum disorders. Journal of Autism and Developmental Disorders, 40, 978–987.PubMedGoogle Scholar
  11. Milne, E., Griffiths, H., Buckley, D., & Scope, A. (2009). Vision in children and adolescents with autistic spectrum disorder: Evidence for reduced convergence. Journal of Autism and Developmental Disorders, 39, 965–975.PubMedGoogle Scholar
  12. Mottron, L., Dawson, M., Soulieres, I., Hubert, B., & Burack, J. (2006). Enhanced perceptual functioning in autism: An update, and eight principles of autistic perception. Journal of Autism and Developmental Disorders, 36(1), 27–43.PubMedGoogle Scholar
  13. Tavassoli, T., Latham, K., Bach, M., Dakin, S. C., & Baron-Cohen, S. (2011). Psychophysical measures of visual acuity in autism spectrum conditions. Vision Research, 51, 1778–1780.PubMedGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.McGill UniversityMontrealCanada