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Suprathreshold Contrast Perception Is Altered by Long-term Adaptation to Habitual Optical Blur.

Cherlyn J Ng1, Ramkumar Sabesan2, Antoine Barbot3

  • 1College of Optometry, University of Houston, Houston, TX, United States.

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Summary
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Visual experience with blur helps the brain adapt neural signals to compensate for imperfect vision. This neural adaptation, or amplification, can be learned even in adulthood to counteract optical aberrations.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Visual Perception

Background:

  • Habitual optical aberrations can affect neural processing of visual information.
  • Understanding neural adaptation to optical blur is crucial for vision science.

Purpose of the Study:

  • To investigate how habitual blur influences neural processing of suprathreshold contrast.
  • To compare contrast processing in emmetropic (normal) and highly aberrated eyes.

Main Methods:

  • Used adaptive optics to correct ocular aberrations.
  • Assessed contrast constancy psychophysically in emmetropic and keratoconic eyes.
  • Employed a contrast matching paradigm at various spatial frequencies.

Main Results:

  • Emmetropes showed contrast constancy with and without corrected aberrations.
  • Keratoconus patients showed constancy with uncorrected aberrations but underconstancy when corrected.
  • Optical correction enabled keratoconus patients to perceive high spatial frequencies previously unexperienced.

Conclusions:

  • Neural signal amplification learned to offset habitual optical aberrations is present in emmetropes and keratoconus patients.
  • Lack of experience with fine spatial detail in corrected keratoconus eyes prevented learning appropriate neural amplification.
  • Adults can learn neural amplification to counteract their own optical aberrations.