It's always great to have a couple backup lenses in your bag for those unexpected changes in weather and light conditions. We have your Oakley Fall Lines covered with several low-light options to choose from.
High Definition Optics® - High Definition Optics® (HDO®) is a collection of patented technologies that allow Oakley eyewear to meet or exceed the testing standards of the American National Standards Institute for optical clarity, visual fidelity, and impact resistance.
VLT stands for Variable Light Transmittance, which is the percentage of light that is allowed to penetrate the lens, for brighter conditions you'll want a lower VLT rating and with darker conditions you'll want a higher VLT rating.
Stormy/Night - VLT between 55% and 100%