Oakley Flak 2.0 XL Glasses Matte Black/Prizm Black Iridium

High Definition Optics HDO
Oakley High Definition Optics (HDO) lenses optimize safety and performance to meet the uncompromising demands of professional athletes who settle for nothing less than the clearest, sharpest, most accurate vision. It offers truer, more accurate vision versus conventional lenses that magnify images and make objects appear shifted from their true position.

Prizm
Prizm lenses were developed to achieve excellente performance on a wide variety of light conditions, eliminating the need to change glasses to adjust to changes in brightness.

Prizm is a true revolution in the world of lenses, a product of years of work and on field experimentation: guarantee control without precedent in terms of light transmission which translates to perfectly calibrated color, maximized contrast and better visibility.