HOYA LongLife Index 

Our dedication to creating the best quality coatings possible drove
HOYA to develop the LongLife Index evaluation method.
The LongLife Index is a measure of the performance and durability of antireflective lens coatings. This evaluation method is made up of five tests
that are more rigorous than the industry standards, to provide eye care
professionals and patients with the HOYA quality guarantee for long-lasting
anti-reflective coatings.
The LongLife Index was developed and adopted by HOYA as a working standard. Passing the rigorous and severe tests gives us the confidence that the coating is of the highest quality and is able to endure extreme conditions and various lifestyles