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Measuring the Behavioral Effects of Intraocular Scatter
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Published on: February 18, 2021

Forward light scatter and visual acuity through scratched protective eyewear.

Jeffery K Hovis1, B Ralph Chou, Keith Whitten

  • 1School of Optometry, University of Waterloo, Waterloo, Ontario, Canada. jhovis@uwaterloo.ca.

Clinical & Experimental Optometry
|August 13, 2013
PubMed
Summary

Scratches on protective eyewear reduce visual performance by scattering light. Haze levels below 2% or luminance reduction factors below 3.0 cd/(m2·lx) are unlikely to impact vision clarity.

Keywords:
hazelens scratchesnarrow angle scatterprotective eyewearvisual acuity

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Area of Science:

  • Occupational Safety and Health
  • Materials Science
  • Vision Science

Background:

  • Surface abrasions on protective eyewear degrade visual performance by scattering light.
  • Existing scratch resistance tests lack real-world visual acuity data.
  • Workplace eyewear damage impacts worker safety and efficiency.

Purpose of the Study:

  • To assess the impact of workplace-induced scratches on protective eyewear.
  • To correlate lens haze and light diffusion with visual acuity.
  • To establish thresholds for acceptable visual performance through damaged lenses.

Main Methods:

  • Collected used protective eyewear from mining and smelting operations.
  • Measured forward scattered light using haze and light diffusion techniques.
  • Determined visual acuity for high and low contrast targets under photopic conditions.

Main Results:

  • Haze values ranged from 1% to 30% in scratched lenses, increasing with dirt accumulation.
  • Light diffusion measurements strongly correlated with haze.
  • Increasing haze moderately reduced visual acuity for both high and low contrast stimuli.

Conclusions:

  • Improper lens cleaning likely causes workplace scratches.
  • Haze <2% or luminance reduction <3.0 cd/(m2·lx) may not significantly impair acuity.
  • Quantifying optical degradation is crucial for maintaining protective eyewear effectiveness.