LongLife Index evaluation method.
The LongLife Index is a measure of the performance and durability of anti-reflective lens coatings. This index is made up of five tests that are more rigorous than most the industry standards, to provide Eye Care Professionals and patients with the HOYA quality guarantee for long-lasting anti-reflective coatings.
It also offers you the confidence that the lenses will maintain their properties over time and are able to endure extreme conditions and various lifestyles.