Precision UV is a contact lens built with special UV resistance technology. It blocks around 90% of the harmful UV rays that all people are exposed to on a daily basis. It's therefore a recommended contact lens for people who work outdoors or enjoy outdoor sports. Precision UV is also a high water contact lens (74% water content) & so transmits a lot of oxygen to the eye. This maintains a refreshed feeling in the eye even with long hours of wear time. Precision UV contact lenses are replaced every month with a fresh pair.