What is polarized?

A polarized lens is equipped with a special filter function that effectively cuts glare in vision caused by diffused reflection of sunlight and other light sources.
Specifically, this lens reduces glare from light reflecting off roads, enabling the wearer to accurately see the road surface condition. It can also reduce diffused reflection from the windows of cars and buildings, which allows for the observation of the inside. By reducing diffused reflection from the surface of water, you can see signs of fish swimming beneath the surface and underwater terrain.
Unlike the cheaper, less durable polarized lenses with poor water-resistance, YAMAMOTO KOGAKU’s polarized lenses feature excellent durability that allows them to adapt to the full range of environmental conditions (temperature, humidity, underwater, etc.) in outdoor sports.

Cut UV, Cut reflected light, Natural light

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.

Difference in vision provided between a polarized and a non-polarized lens


By cutting the glare of the light reflected from the road surface,
clear vision can be provided in lush green scenery.


Glares can be reduced by effectively cutting the diffused light beams from the surface of water,
enabling you to get a clear view of the fish and the river bottom.


Reduced light reflection helps the wearer capture a clearer view of the moguls with brighter colors while substantially cutting out the glare.


The lenses reduce the glare from the water surface and offer clear vision even in strong sunlight.