Some SWANS eyewear have different anti-fog coatings depending on the environment in which the product is going to be used.
Among such anti-fog coating materials, the premium anti-fog coating offers the highest anti-fog effect for wearers of products marked with this specification.

Moisture that evaporates from the eyes / Moisture from skin such as sweat / lens / Anti-fog coating PREMIUM ANTI-FOG

PREMIUM ANTI-FOG for swimming goggles

Premium Anti-Fog is a new anti-fogging technology. By forming a thin film of water inside the goggles, it absorbs perspiration and other vapors emitted by the skin—causes of fogging—to keep vision clear.

How to use the premium anti-fog (PAF) products to maximize their performance

The PAF function offers an anti-fog effect when it is wet with water. Use the eyewear after wetting the inside of the lenses well. The inside of the lenses feels slippery when wet.
This is due to the PAF finish. Do not touch the inside of the lenses when handling the product. It may damage the special coating.
When the PAF coating is rubbed by fingertips or a towel, it may sustain scratches, which degrades the anti-fog effect.
If using a separately sold smear-on type demister, do not push the sponge at the tip of the bolt strongly against the lenses when applying. It may cause scratches.
When dirt or grease adheres to the PAF coating, it reduces the anti-fog effect. Rinse the lenses with tap water before use, remove the water, and leave to naturally dry in the shade.
Washing the PAF lenses with shampoo or conditioner may reduce the anti-fog effect. Do not use such washing agents.


PREMIUM Anti-fog / Normal Anti-Fog

MIT lens Mirror Insert Tech.

What is MIT lens

Peeling is a common issue in standard vapor-deposition mirror coating, the final stage of the lens process. However,
our mirror technology eliminates this worry by sealing the mirror layer inside the lens. Furthermore,
since this technology involves use of a uniform mirror layer formed in advance,
it eliminates the issues of color spotting and differences in coloration in the field of view.
In addition, since the lenses of safety glasses and snow goggles have a petroid coating on the outermost layer,
they result in mirror lenses with strong scratch resistance.


    Clear vision

    This technology involves use of a uniform mirror layer formed in advance, it eliminates the issues of color spotting and differences in coloration in the field of view.



    Mirrored surfaces that will not scratch by sandwiching a mirrored layer between lenses.



    Mirrored surfaces that will not peel, by sandwiching a mirrored layer between lenses.

MIT lens feature for swimming goggles

01 Polycarbonate layer, 02 MIT layer, 03 Polycarbonate layer


What is polarized lens?

These lenses are equipped with special filtering functions that effectively block out glare in the vision due to diffuse reflection of light from the sun and other sources. Specifically, they enable a clear view of unevenness in the road by restraining glare from the road’s surface, make it possible to see inside buildings and other structures by reducing diffuse reflection of light on windows, and make it possible to see fish and underwater features by reducing glare from the water’s surface.
In addition, unlike low-priced polarizing lenses, which are susceptible to water damage and lack durability, Yamamoto Kogaku’s polarizing lenses have the durability needed for use in a wide range of outdoor recreation environments (including uses in extreme temperature and humidity and underwater).

Cut UV, Cut the 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.

With polarized lens

Enable a clear view of unevenness underwater features by reducing glare from the water’s surface.


Automatically change the lens color.

These lightly tinted lenses darken under strong UV rays, with their tint darkening to the maximum degree as the UV strengthens and lightening as it weakens. Since the color of the lens itself changes with the brightness of the field of view, they can be used under a wide range of conditions. In addition, Yamamoto Kogaku’s photochromic lenses are distinguished by their rapid speed of adjustment.

Change of lens color by photochromic function

  • Amount of UV [High]

  • Amount of UV [Mid]

  • Amount of UV [Low]