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Eric Denion1, Audrey Emmanuelle Dugué, Sylvain Augy

  • 1*MD †MSc ‡MD, PhD Departments of Ophthalmology (ED, SC-P, FM) and Biostatistics and Clinical Research (AED, SA), CHU de Caen; and Université de Caen Basse-Normandie (AED, FM), Medical School, Caen, France.

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Thick sunglasses reduce lateral glare but significantly decrease the eye motion visual field by 22%. Thin sunglasses do not impact visual field or glare, offering a better balance for visual exploration.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Sunglasses are commonly worn to reduce glare and protect eyes from UV radiation.
  • Different frame designs and temple widths can potentially affect the wearer's visual field.

Purpose of the Study:

  • To compare the impact of thick-framed sunglasses versus thin-framed sunglasses on visual field and glare perception.
  • To assess how frame design influences the ability to explore lateral visual space.

Main Methods:

  • Utilized the Goldmann perimeter to measure visual field surface area in 15 healthy volunteers.
  • Assessed visual fields with and without two types of sunglasses: thick-framed and thin-framed.
  • Quantified glare reduction using a surgical lighting system at various angles.

Main Results:

  • Thin sunglasses showed no significant impact on base or eye motion visual fields.
  • Thick sunglasses caused a significant 22% decrease in the eye motion visual field (p < 0.001), particularly in the temporal quadrant (-33%).
  • All participants reported significantly less lateral glare with thick sunglasses compared to thin ones (p < 0.001).

Conclusions:

  • Thick sunglasses provide superior lateral glare protection but substantially compromise visual field, especially during eye motion.
  • The benefit of glare reduction from thick sunglasses is offset by a significant loss of peripheral visual information.
  • Optimum sunglass design requires balancing glare reduction with maintaining an adequate visual field for safe spatial exploration.