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Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing
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Defocused contrast sensitivity function in peripheral vision.

Durgasri Jaisankar1, Marwan Suheimat1, Robert Rosén2

  • 1Centre for Vision and Eye Research, Queensland University of Technology, Queensland, Australia.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|December 13, 2021
PubMed
Summary
This summary is machine-generated.

Researchers identified notches in peripheral vision

Keywords:
adaptive opticscontrast sensitivity functiondefocusdetectionnotchesperipheral field

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Area of Science:

  • Ophthalmic optics
  • Human visual perception

Background:

  • Human peripheral vision is influenced by optical factors like defocus and aberrations.
  • Optical theory predicts defocus should create notches in the contrast sensitivity function (CSF), but these are not typically observed in peripheral vision.

Purpose of the Study:

  • To determine if human peripheral vision can detect CSF notches caused by monochromatic defocus.
  • To investigate the presence of these notches when other monochromatic ocular aberrations are corrected.

Main Methods:

  • Contrast sensitivity functions (CSFs) were measured in three emmetropic adults.
  • Measurements were taken on-axis and at 20° nasal eccentricity using adaptive optics correction in monochromatic light with and without ±2 D defocus.
  • Defocused CSFs were compared to theoretical predictions.

Main Results:

  • Notches were identified in peripheral monochromatic defocused CSFs at predicted spatial frequencies when other aberrations were corrected.
  • The observed notch depths were shallower (0.3 to 0.9 log unit) than theoretically predicted.
  • Adequate spatial frequency sampling was crucial for notch identification.

Conclusions:

  • Notches in monochromatic defocused CSFs can be detected in peripheral vision (on-axis and 20° eccentricity) with fine spatial sampling and corrected aberrations.
  • These notches, if unrecognized, could introduce noise into peripheral visual performance measurements.