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Related Experiment Videos

Verifying and evaluating progressive addition lenses in clinical practice.

G R Bell1

  • 1drgbell@pacbell.net

Optometry (St. Louis, Mo.)
|May 8, 2001
PubMed
Summary

Clinical verification of progressive addition lenses (PALs) is crucial. This study found premium and non-premium PALs performed similarly, with significant inconsistencies across brands and notable improvements in maximum astigmatic distortion over time.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Optical Engineering

Background:

  • Progressive addition lenses (PALs) constitute over 50% of multifocal lenses in the US.
  • Existing clinical verification methods for PALs are inadequate.
  • Automated lensmeter techniques offer a simplified approach to PAL verification.

Purpose of the Study:

  • To present a simplified method for clinical verification of progressive addition lenses.
  • To compare the performance of premium-quality versus non-premium-quality progressive lenses.
  • To assess variations in lens characteristics across different brands.

Main Methods:

  • Thirty pairs of progressive lenses were analyzed using a modified Humphrey 330 Lens Analyzer.
  • Fifteen pairs were classified as 'premium-quality' and fifteen as 'non-premium-quality'.
  • Five key criteria were measured: Distance Zone Width (DZW), Intermediate Zone Width (IZW), Near Zone Width (NZW), Drop Distance (DD), and Maximum Astigmatic Distortion (MAD).

Main Results:

  • No significant difference in performance was found between premium and non-premium progressive lenses.
  • Considerable product inconsistency was observed within every brand tested.
  • Zone size variations were substantial and appeared across all tested brands.

Conclusions:

  • Performance characteristics of premium and non-premium PALs are comparable.
  • Significant variations in zone sizes exist, irrespective of lens quality or brand.
  • Improvements in Maximum Astigmatic Distortion (MAD) have been noted since 1986, with specific lenses showing potential benefits for certain frame types.

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