What is degree of polarization?
The principle of the polarized lens is often likened to a window blind. The performance of a polarized lens is predominantly determined by how closely aligned the blind structure is and how accurately it is laid out so that it is level when the product is worn by the user.
The polarization degree is a numerical value that represents the density of the blind structure. In Japan, polarized lens is defined to have at least 90% polarization degree (cuts 90% or more of reflected light).
The polarization degree and the lens brightness correlate, so a lighter colored polarized lens tends to have a lower polarization degree.
Regardless of genre, be it for snow sports or swimming, the polarized lenses used in SWANS’ eyewear are constructed using an integrated lens and polarized film unit. They are designed so that their cut angles and their layout on the frame—both of which affect the performance of the lenses—are accurate in the finished product.
The polarization degrees for products with a polarization function are available on the respective product tags and the specifications chart on the product information page.