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Statistical procedures for impact resistance testing at increased drop-ball heights

G L Stephens1

  • 1College of Optometry, University of Houston, Texas, USA.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|August 1, 1995
PubMed
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This study introduces a new impact resistance testing method for eyewear using higher drop-ball heights. This approach requires smaller sample sizes, making eyewear impact testing more efficient and cost-effective.

Area of Science:

  • Ophthalmology and Materials Science
  • Optometry and Eyewear Safety Standards

Background:

  • Standard impact resistance testing for prescription eyewear and sunglasses uses a 50-inch drop-ball height.
  • Current methods ensure product safety but may require large sample sizes for statistical significance.

Purpose of the Study:

  • To present a novel statistics-based impact resistance testing method for eyewear.
  • To evaluate the efficacy of increased drop-ball heights in eyewear impact testing.

Main Methods:

  • Literature review to gather impact resistance data for glass and plastic lenses.
  • Development of testing procedures using increased drop-ball heights to characterize lens batches.
  • Statistical analysis to determine acceptance probabilities for marginal and high-quality lens batches.

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Main Results:

  • Increasing drop-ball test height generally reduces the required sample size for impact resistance validation.
  • Multiple test parameter combinations were found to meet the developed impact resistance testing procedure requirements.
  • The study demonstrated a statistically sound method for eyewear impact testing.

Conclusions:

  • Impact resistance testing with elevated drop-ball heights offers a viable alternative to traditional methods.
  • This approach allows for smaller sample sizes, reducing testing costs and time.
  • The necessary equipment for this enhanced testing method is accessible and affordable.