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Peripheral refraction under different levels of illuminance.

María Concepción Marcellán Vidosa1, Laura Remón1, Francisco J Ávila1

  • 1Department of Applied Physics, Universidad de Zaragoza, Zaragoza, Spain.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|November 11, 2023
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Summary

Lower light levels increase relative peripheral hyperopia in myopic eyes, suggesting peripheral illuminance may protect against myopia progression. This study examined peripheral refraction across various light conditions.

Keywords:
illuminance levelsmyopia controlperipheral refraction

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Optometry

Background:

  • Peripheral refraction is implicated in myopia development.
  • Understanding how light levels affect peripheral refraction is crucial for myopia research.

Purpose of the Study:

  • To compare relative peripheral refraction (RPR) across four illuminance levels, from photopic to scotopic conditions.
  • To investigate the relationship between peripheral eye growth and varying light exposure in myopic individuals.

Main Methods:

  • Employed an open-field autorefraction method on 114 myopic eyes.
  • Calculated RPR by subtracting central from peripheral autorefraction measurements at different visual field eccentricities.
  • Assessed RPR under illuminance levels ranging from 0 lux (scotopic) to 300 lux (photopic).

Main Results:

  • A significant increase in relative peripheral hyperopia was observed with greater visual field eccentricity in myopic eyes.
  • Relative peripheral hyperopia increased as illuminance decreased, particularly notable between scotopic and photopic conditions.
  • Statistically significant differences in RPR were found between 0 and 300 lux at 30° temporal and 20°/30° nasal visual fields.

Conclusions:

  • Reduced peripheral illuminance is associated with increased relative peripheral hyperopia in young adults with myopia.
  • Findings suggest that higher peripheral light exposure may offer a protective effect against myopic eye growth.
  • Further research into light modulation strategies for myopia control is warranted.