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Related Experiment Videos

Varifocal spectacle lens surface power measurement.

C W Fowler1, C M Sullivan

  • 1Vision Sciences Department, Aston University, Birmingham, UK.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|January 1, 1988
PubMed
Summary

A new reflection instrument assesses varifocal lens surfaces. Measurements reveal differences between glass and plastic lens versions, aiding optical manufacturing and material selection.

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Area of Science:

  • Optical engineering
  • Materials science

Background:

  • Varifocal lenses are critical optical components.
  • Accurate surface assessment is essential for lens performance.

Purpose of the Study:

  • To introduce a novel instrument for varifocal lens surface assessment.
  • To compare glass and plastic varifocal lenses using this technique.

Main Methods:

  • Utilized a reflection-based technique for surface analysis.
  • Performed measurements on multiple lenses of identical design but different materials.

Main Results:

  • Demonstrated the capability of the reflection instrument for varifocal lens assessment.
  • Quantified variations in surface characteristics between glass and plastic lenses.

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Conclusions:

  • The developed instrument provides a reliable method for evaluating varifocal lens surfaces.
  • Significant differences exist between glass and plastic lens versions, impacting optical design and manufacturing.