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Updated: Jun 11, 2025

Using Eye Movements Recorded in the Visual World Paradigm to Explore the Online Processing of Spoken Language
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Experimental Method for Identifying Regions of Use of a Progressive Power Lens Using an Eye-Tracker: Validation

Clara Benedi-Garcia1, Pablo Concepcion-Grande1, Eva Chamorro1

  • 1Clinical Research Department, Indizen Optical Technologies, 28002 Madrid, Spain.

Life (Basel, Switzerland)
|September 28, 2024
PubMed
Summary

This study used eye-tracking to compare actual progressive lens use with theoretical regions. Findings show significant concordance, informing customized progressive lens design for better vision tasks.

Keywords:
eye-trackingprogressive power lensespupil positionregions of use

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Area of Science:

  • Optometry
  • Ophthalmology
  • Human Factors Engineering

Background:

  • Progressive power lenses (PPLs) utilize power distribution for defined usable regions.
  • Recent research indicates PPL regions are not always used as predicted for specific tasks.

Purpose of the Study:

  • To determine the concordance between actual PPL region usage and theoretically defined regions.
  • To investigate how user posture influences lens utilization during visual tasks.

Main Methods:

  • Employed an eye-tracking system (Tobii-Pro-Glasses 3) to record pupil position in 26 subjects.
  • Tasks included distance (5.25 m) and near-reading (37 cm) while wearing general-use PPLs.
  • Projected pupil position onto the lens's back surface to identify actual usage regions.

Main Results:

  • High concordance observed between actual and theoretical PPL regions.
  • Average concordance was 85% for distance tasks and 73% for near-reading tasks.
  • User posture significantly affects lens usage patterns.

Conclusions:

  • The developed method accurately identifies actual PPL usage areas.
  • Insights gained can drive the design of customized PPLs tailored to individual visual task needs.