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Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing
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Visual Performance as a Function of Clear Central Aperture Diameter with a Defocused Myopic Periphery.

Ryo Kubota, Nabin R Joshi1, Inna Samandarova1

  • 1Manhattan Vision Associates/Institute for Vision Research, New York, New York.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|August 30, 2021
PubMed
Summary

A 15° radial aperture with peripheral myopic defocus minimally impacts visual performance. This finding is crucial for designing effective myopia control spectacles and contact lenses.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Peripheral myopic defocus is a key factor in myopia progression.
  • Understanding its impact on visual performance is essential for myopia control strategies.

Purpose of the Study:

  • To evaluate how different clear central aperture sizes, combined with peripheral myopic defocus, affect various visual performance tasks.
  • To determine the optimal aperture size for minimizing visual performance disruption.

Main Methods:

  • Thirty visually normal subjects were tested with five spectacle conditions: three single-vision lenses with 10°, 12.5°, and 15° clear apertures and peripheral defocus (+3.5 D), progressive addition lenses (PALs) with +3.5 D addition, and single-vision lenses (SVLs) without defocus.
  • Visual performance was assessed using static and kinetic visual field sensitivity, reading rate and comprehension, head movements, and saccadic eye movements.

Main Results:

  • Reading rate and comprehension remained consistent across all conditions.
  • Static visual field sensitivity decreased in eccentric regions for all tested apertures compared to SVL and PAL conditions.
  • The 15° aperture demonstrated superior performance, showing minimal differences in head movement and saccadic tracking compared to SVL and PAL conditions.

Conclusions:

  • A 15° radial aperture with peripheral myopic defocus offers the least adverse effect on visual performance.
  • These findings support the use of specific aperture designs in spectacles and contact lenses for effective myopia management with minimal visual compromise.