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Amblyopia Affects the ON Visual Pathway More than the OFF.

Carmen Pons1, Jianzhong Jin1, Reece Mazade1

  • 1Department of Biological and Visual Sciences, SUNY College of Optometry, New York, New York 10036.

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|June 14, 2019
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Amblyopia, a vision deficit, strengthens dark perception by disproportionately weakening the ON visual pathway. This finding suggests new treatments targeting the ON pathway for improved vision in children.

Keywords:
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Area of Science:

  • Neuroscience
  • Visual Processing
  • Developmental Biology

Background:

  • Visual information travels via parallel ON and OFF pathways.
  • Optical blur disproportionately reduces visual salience of light stimuli by affecting high spatial frequencies.
  • Previous work indicated low spatial frequencies drive weaker ON than OFF cortical responses.

Purpose of the Study:

  • To test the hypothesis that sustained optical blur during development weakens ON pathways more than OFF pathways.
  • To investigate the impact of amblyopia on visual dark dominance.
  • To explore the underlying mechanisms of altered visual perception in amblyopia.

Main Methods:

  • Studied humans with anisometropic and strabismic amblyopia.
  • Assessed visual dark dominance and its correlation with amblyopia severity.
  • Utilized a computational model simulating ON and OFF pathway responses to low spatial frequencies.

Main Results:

  • Sustained optical blur and amblyopia increase visual dark dominance by 3-10 times.
  • Increased dark dominance in amblyopia is strongly correlated with severity.
  • A computational model replicating these findings showed greater luminance/response saturation in ON pathways.

Conclusions:

  • Amblyopia preferentially affects the ON cortical pathway over the OFF pathway.
  • This ON pathway vulnerability contributes to increased visual dark dominance in amblyopia.
  • Findings may inform novel amblyopia treatments targeting the ON pathway.