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Updated: Aug 11, 2026

Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
Published on: March 29, 2022
Progressive addition lenses--measurements and ratings
Jim Sheedy1, Raymond F Hardy, John R Hayes
1The Ohio State University, College of Optometry, Columbus, Ohio 43210, USA. sheedy.2@osu.edu
Optical analysis of progressive addition lenses (PALs) reveals significant differences in viewing zones and astigmatism. These findings aid eye care practitioners in selecting optimal PAL designs for patient visual needs.
Area of Science:
- Ophthalmic optics
- Vision science
Background:
- Follow-up study analyzing progressive addition lens (PAL) optics.
- Previous research measured and analyzed PAL designs.
Purpose of the Study:
- Provide data on various PAL designs for practitioners.
- Enable selection of PALs based on patient viewing requirements.
Main Methods:
- Measured optical properties of 23 different PAL designs using a Rotlex Class Plus lens analyzer.
- Calculated viewing zone dimensions and unwanted astigmatism.
- Normalized measurements to eliminate laboratory errors.
Main Results:
- Significant differences found between PAL designs in viewing zone size/width and astigmatism.
- Calculated ratings for distance, intermediate, and near viewing areas.
- Determined ratings for unwanted astigmatism and minimum fitting heights.
Conclusions:
- Ratings can guide selection of PALs matching patient visual needs.
- Ratings can evaluate the performance of currently worn PALs.
- Clinical trials are needed to validate hypothesis on PAL selection based on differences.
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