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Recent trends in progressive power lenses
1Vision Sciences Department, Aston University, Birmingham, UK.
Summary
New progressive addition spectacle lens designs are continually emerging, incorporating advancements like aspheric surfaces and improved Alvarez lens systems. Research also explores optimizing single vision lenses to enhance depth of field for early presbyopia.
Area of Science:
- Optometry and Vision Science
- Ophthalmic Lens Design
Background:
- Progressive addition spectacle lenses, first introduced in the 1950s, continue to evolve with new design iterations.
- Presbyopia, the age-related loss of near focusing ability, necessitates visual correction strategies.
Purpose of the Study:
- To review recent patent literature on novel progressive addition lens designs.
- To discuss advancements in general-purpose progressive lenses and specialized systems.
- To explore methods for improving depth of field in single vision lenses for early presbyopes.
Main Methods:
- Review of recent patent literature concerning progressive addition spectacle lens designs.
- Analysis of design improvements, including aspheric surface integration.
- Examination of specialized lens systems like the Alvarez lateral translation lens.
- Discussion of single vision lens optimization techniques.
Main Results:
- Recent patents reveal ongoing innovation in progressive lens design, including enhancements for distance vision with aspheric surfaces.
- An improved Alvarez lateral translation lens system has been patented.
- Optimization strategies for single vision lenses aim to extend depth of field for individuals with early presbyopia.
Conclusions:
- The field of progressive addition lens design remains dynamic, with continuous development of new technologies.
- Innovations focus on improving visual performance across different distances and addressing specific visual needs like early presbyopia.
- Further research into lens design optimization holds promise for enhanced visual correction.