PILLA is a performance eyewear company that is based on engineering. Our philosophy is that there is always another opportunity to enhance lens performance. We have been engineering color profiles for lens infusion for over 25 years. Pilla has utilized a variety of lens philosophies that include Enhanced Definition, High Contrast, Neutralization, and accelerated manipulation of the visual light spectrum.Progressive Neutralizer - The lens on top reflects a 20% transmittance while the bottom reflects a transmittance of 68%. Fantastic for green backgrounds.