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Related Experiment Videos

Computerized Moiré analysis of progressive addition lenses.

W M Rosenblum1, D K O'Leary, W J Blaker

  • 1School of Optometry, University of Alabama, Birmingham.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|December 1, 1992
PubMed
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A new digital Moiré analysis method uses subtractive imaging to visualize ophthalmic lens power. This technique quickly reveals variations in progressive-addition lenses (PALs), aiding manufacturers.

Area of Science:

  • Optics
  • Image Analysis
  • Ophthalmic Lens Metrology

Background:

  • Accurate characterization of ophthalmic lenses is crucial for visual performance.
  • Existing methods for analyzing lens power, especially progressive-addition lenses (PALs), can be complex or time-consuming.
  • Digital image processing offers potential for novel metrology techniques.

Purpose of the Study:

  • To develop and evaluate a novel, rapid, and repeatable method for analyzing ophthalmic lens power distribution.
  • To investigate the utility of subtractive Moiré analysis for comparing magnification effects induced by lenses.
  • To assess the variability between different brands of progressive-addition lenses (PALs).

Main Methods:

  • A computerized image capture system with 256-level intensity resolution was employed.

Related Experiment Videos

  • Digital images of a standard square-wave grating were acquired with and without an ophthalmic lens.
  • Subtractive Moiré analysis was performed by digitally subtracting the pixel intensity distributions of the two images.

    • Main Results:

    • The subtractive Moiré patterns graphically represented the power distribution of the tested ophthalmic lenses.
    • Significant variations in Moiré patterns were observed between different brands of progressive-addition lenses (PALs) with the same nominal power.
    • The method proved to be fast and repeatable using commercially available components.

    Conclusions:

    • Digital subtractive Moiré analysis provides a fast, repeatable, and graphical method for assessing ophthalmic lens power.
    • The technique effectively highlights variations in magnification and power across different progressive-addition lens brands.
    • This approach offers value to ophthalmic lens manufacturers and finishers for quality control and product development.