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Transcranial direct current stimulation affects visual perception measured by threshold perimetry.

Antje Kraft1, Jasper Roehmel, Manuel C Olma

  • 1Department of Neurology, Universitätsmedizin Charité Berlin, Charitéplatz 1, 10117, Berlin, Germany.

Experimental Brain Research
|November 4, 2010
PubMed
Summary

Anodal transcranial direct current stimulation (tDCS) improved contrast sensitivity in the central visual field for healthy subjects. This finding suggests potential therapeutic applications for visual impairments.

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Last Updated: Jun 7, 2026

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Visual Perception

Background:

  • Contrast sensitivity is crucial for visual function.
  • Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique.
  • The visual cortex's representation of the visual field influences stimulation effects.

Purpose of the Study:

  • To investigate the impact of anodal and cathodal tDCS on contrast sensitivity.
  • To examine these effects at different visual field eccentricities.
  • To differentiate stimulation effects from learning effects.

Main Methods:

  • Double-blind, sham-controlled, within-subject design.
  • tDCS applied to the visual cortex.
  • Contrast sensitivity measured at eccentricities within 10 degrees.
  • Separate testing days to assess stimulation and learning effects.

Main Results:

  • Anodal tDCS significantly increased contrast sensitivity within 8 degrees of the visual field compared to sham.
  • Significant contrast sensitivity improvement post-anodal stimulation was observed only for eccentricities < 2 degrees.
  • Cathodal tDCS showed no significant effect on contrast sensitivity.
  • Perceptual learning was observed only in pre-stimulation threshold perimetry.

Conclusions:

  • Anodal tDCS enhances central visual contrast sensitivity in healthy individuals.
  • The effect is most pronounced in the very central visual field (eccentricities < 2°).
  • tDCS may hold promise for treating visual deficits, measurable with tools like threshold perimetry.