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Related Experiment Videos

Nonprescription tinted eyewear optical accuracy study.

S C Cooper1, J A Smith, M Katz

  • 1Pacific University College of Optometry, Forest Grove, Oregon 97116, USA. cooper@pacific.edu

Optometry (St. Louis, Mo.)
|August 25, 2001
PubMed
Summary

Noncorrective sunglasses can cause prismatic deviation, especially high-wrap styles. This study measured prism in popular sports eyewear, finding significant deviations that may affect athletes.

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Area of Science:

  • Optometry
  • Sports Vision
  • Ophthalmology

Background:

  • Nonprescription tinted eyewear, or plano sun eyewear, can induce prismatic deviation.
  • High-wrap designs exacerbate this effect, potentially impacting visual performance.

Purpose of the Study:

  • To quantify the horizontal and vertical prismatic deviation in popular premium plano sun eyewear.
  • To assess the impact of these deviations on athletes who frequently use such eyewear.

Main Methods:

  • Measured prismatic deviations in two pairs of high-wrap, steep base curve, plano sun eyewear from six national brands.
  • Evaluated deviations in primary gaze and at 30 degrees peripheral gaze (temporal and nasal).

Main Results:

  • Most eyewear induced base-out and base-down prism in primary gaze.
  • All tested eyewear exhibited base-in prism with temporal gaze and base-out prism with nasal gaze.
  • Base-down prism was also common with lateral gaze.

Conclusions:

  • Plano sun eyewear is used in visually demanding sports like golf, baseball, and volleyball.
  • Athletes have superior visual function, making the impact of induced prism a critical area for further study.
  • Additional research is needed to understand the effects on both average and elite athletes.

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