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Related Experiment Videos

Localized defects in ophthalmic lenses.

J S Stroud1

  • 1Schott Glass Technologies Inc., Duryea, Pennsylvania.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|March 1, 1989
PubMed
Summary

Ophthalmic lenses undergo shadowgraph inspection for defects like scratches and power aberrations. Polycarbonate lenses show more defects than glass or hard resin, impacting lens compliance with standards.

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Area of Science:

  • Materials Science
  • Optical Engineering
  • Ophthalmology

Background:

  • Ophthalmic lenses are critical for vision correction.
  • Lens materials like glass, hard resin, and polycarbonate are susceptible to localized defects.
  • Defects can impact optical performance and patient satisfaction.

Purpose of the Study:

  • To analyze localized defects in ophthalmic lenses.
  • To determine the types, frequency, and severity of defects.
  • To compare defect prevalence across different lens materials.

Main Methods:

  • Utilized shadowgraphy for defect inspection.
  • Categorized defects by nature, frequency, and severity.
  • Examined glass, hard resin, and polycarbonate lens samples.

Main Results:

  • Identified scratches, pits, and localized power aberrations as common defects.
  • Found localized defects more prevalent in polycarbonate lenses.
  • Linked defects to incomplete polishing and coating thickness variations.

Conclusions:

  • Polycarbonate lenses present a higher risk for localized defects.
  • Understanding defect origins is crucial for quality control.
  • Lens compliance with defect standards requires careful material selection and manufacturing processes.

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