April 2011
Volume 52, Issue 14
Free
ARVO Annual Meeting Abstract  |   April 2011
Figure Ground Discrimination in Age-Related Macular Degeneration
Author Affiliations & Notes
  • Thi Ha Chau Tran
    Ophthalmology, Hopital Saint Vincent, Lille, France
    Laboratoire de Neuroscience Fonctionnelle et Pathologies, CNRS, Université Lille Nord de France, France
  • Nathalie Guyader
    Grenoble-Image-Parole-Signal-Automatique lab (GIPSA-lab), CNRS, Institut National Polytechnique de Grenoble., France
  • Anne Guerin
    Grenoble-Image-Parole-Signal-Automatique lab (GIPSA-lab), CNRS, Institut National Polytechnique de Grenoble., France
  • Pascal Despretz
    Laboratoire de Neuroscience Fonctionnelle et Pathologies, CNRS, Université Lille Nord de France, France
  • Muriel Boucart
    Laboratoire de Neuroscience Fonctionnelle et Pathologies, CNRS, Université Lille Nord de France, France
  • Footnotes
    Commercial Relationships  Thi Ha Chau Tran, None; Nathalie Guyader, None; Anne Guerin, None; Pascal Despretz, None; Muriel Boucart, None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science April 2011, Vol.52, 6068. doi:
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    • Get Citation

      Thi Ha Chau Tran, Nathalie Guyader, Anne Guerin, Pascal Despretz, Muriel Boucart; Figure Ground Discrimination in Age-Related Macular Degeneration. Invest. Ophthalmol. Vis. Sci. 2011;52(14):6068.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose: : To investigate impairment in discriminating a figure from its background, and to study its relation with visual acuity and lesion size in patients with neovascular age-related macular degeneration (AMD).

Methods: : Seventeen patients, with neovascular AMD and a visual acuity of less than 20/50 were included. Seventeen age-matched healthy subjects participated as controls. Complete ophthalmologic examination was performed on all participants. The stimuli were photographs of scenes containing animals (targets) or other objects (distractors), displayed on a computer monitor screen. Performance was compared in four background conditions: the target in the natural scene; the target isolated on a white background; and the target separated by a white space from either a structured scene or a non-structured shapeless background. Target discriminability (d’) was recorded

Results: : Performance was lower for patients than for controls. For the patients, it was easier to detect the target when separated from its background (under isolated, structured and non-structured conditions) than it was when located in a scene. The performance of patients was improved with increasing exposure time, but remained lower in controls. Correlations were found between visual acuity, lesion size and sensitivity for patients.

Conclusions: : Figure/ground segregation is impaired in patients with AMD. A white space surrounding the object is sufficient to improve its detection and to facilitate figure/ground segregation. The results may have practical applications to the rehabilitation of the environment in patients with AMD.

Keywords: age-related macular degeneration • detection • discrimination 
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