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Related Experiment Videos

Ophthalmic lens retention in safety frames

Y M Johnson1, G W Good

  • 1CIBA Vision Corporation, Duluth, Georgia, USA.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|February 1, 1996
PubMed
Summary

Metal safety frames offer superior lens retention compared to zyl frames during high-mass, low-velocity impacts. Lens thickness did not affect retention in high-mass impacts but influenced performance in low-mass, high-velocity tests.

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Area of Science:

  • Ophthalmology
  • Materials Science
  • Occupational Safety

Background:

  • Safety frames are crucial for protecting the eyes.
  • Understanding lens retention is vital for eyewear performance and safety.

Purpose of the Study:

  • To evaluate lens retention in metal versus zyl safety frames.
  • To determine the impact of different impact types and lens thicknesses on retention.

Main Methods:

  • Tested plano polycarbonate lenses in metal and zyl frames.
  • Utilized high-mass, low-velocity (HM-LV) and low-mass, high-velocity (LM-HV) impact tests.
  • Analyzed lens displacement and retention based on frame material and lens thickness.

Main Results:

  • Metal frames showed significantly better lens retention than zyl frames under HM-LV impact (p < 0.01).

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  • Both frame materials performed equally under LM-HV impact (p = 1.00).
  • Lens thickness did not influence retention in HM-LV impacts (p = 0.958), but thinner lenses (1.6 mm) were more easily displaced in LM-HV impacts (p = 0.003).

    • Conclusions:

    • Metal safety frames provide superior lens retention in high-mass, low-velocity impact scenarios.
    • Lens thickness is a critical factor for retention in low-mass, high-velocity impacts, with thicker lenses offering better stability.