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Spatial alignment over retinal scotomas.

Michael D Crossland1, Peter J Bex

  • 1University College London Institute of Ophthalmology, London, United Kingdom. m.crossland@ucl.ac.uk

Investigative Ophthalmology & Visual Science
|November 26, 2008
PubMed
Summary
This summary is machine-generated.

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Visual completion mechanisms differ between physiological blind spots and retinal scotomas. This suggests higher-level processing for scotomas, not low-level visual system reorganization in eye disease.

Area of Science:

  • Visual neuroscience
  • Psychophysics
  • Ophthalmology

Background:

  • Perceptual completion can obscure retinal scotomas.
  • Understanding completion mechanisms is key to visual system reorganization theories in eye disease.

Purpose of the Study:

  • To investigate the psychophysical processes underlying perceptual completion of physiological and pathological retinal scotomas.
  • To differentiate completion mechanisms by comparing spatial alignment tasks.

Main Methods:

  • Vernier alignment thresholds were measured in control subjects over the physiological blind spot and eccentric retina.
  • Alignment thresholds were assessed in subjects with retinal scotomas over scotomas and equally eccentric intact retina.

Main Results:

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  • Alignment thresholds were significantly better over the physiological blind spot compared to eccentric retina in controls.
  • No significant difference in alignment thresholds was found between pathological scotomas and equally eccentric intact retina.

Conclusions:

  • Mechanisms for perceptual completion differ between physiological and pathological retinal scotomas.
  • Pathological scotoma completion involves higher-level image processing, while physiological blind spot completion includes low-level, possibly hardwired, processes.
  • Findings argue against low-level visual system reorganization in retinal disease.