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What do I need to know about lenses?

Snowboard and ski goggles fulfill a lot of functions and belong to the basic equipment for every winter sports enthusiast. To not only keep track on the slopes, but also in the lens technology, we have summarized the most important information about color, shape and function for you. The NAKED Optics lens guide turns you into a lens expert.

What does visible light transmission (VLT) mean?

The individual and unique designs of snowboard and ski goggles need to fit in with two things: With the outfit and above all with the weather and visibility conditions. Which goggles or lenses fit in with which conditions? The visible light transmission (VLT) helps. The VLT value is expressed in percentage and shows how much light can transmit through the lens. The higher the VLT %, the more light can transmit through the glass. A high light transmission optimizes visibility, especially in bad conditions like snowfall or fog. A low VLT % means that less light can get through the lens. Furthermore, in order to find the right snowboard or ski goggles for the certain conditions the visible light transmission values are divided into different categories (CAT). Each category is suitable for specific weather conditions. The following table serves as orientation:

Visible light transmission (VLT)

Category (CAT.)


Suitable for


CAT. 0

Very low light

Night skiing


CAT. 1

Low light and bad conditions

Snowfall and fog



Changing conditions or normal conditions

Cloudy and partly sunny weather


CAT. 3

Normal conditions or sunny conditions

Bright daylight


CAT. 4

Very sunny and bright conditions

Bright sunshine /glacier

Cylindrical vs. spherical lenses: What is the difference?

Have you ever heard about cylindrical and spherical lenses? These are the two common lens shapes of snowboard goggles and ski goggles. Cylindrical lenses are horizontally curved and vertically flat. In contrast, spherical lenses are curved horizontally and vertically. This lens shape is based on the shape of the eyes. It enables a wider field of vision and allows air to circulate better. Winter sports glasses with spherical lenses are getting more popular. So basically, the shape of the lens also plays an important role in finding the best vision.

How does the magnetic changing system work?

As quickly as getting from the valley to the summit, the weather can change. From bright sunshine to fog within a few seconds. Those kind of skiing days are also part of the winter fun. To be able to adapt to the fast weather changes and to keep the best view possible, it is necessary to adapt yourself to the conditions within seconds. The SnapTech magnetic changing system enables you to react quickly. With a few simple steps, the goggle lens can be exchanged from a good weather lens to a bad weather lens. Thus, even a snowfall cannot hold you back from downhill turns. The following NAKED Optics goggles are equipped with the SnapTech magnetic system: The STORM, The TROOP EVO, The FORCE EVO, The REBEL. 

How can I prevent fog from my goggles?

There is probably nothing more annoying than fogged ski goggles on the slopes. Why this happens sometimes can be explained easily. It's cold outside and warm inside. If the air is not sufficiently circulated, then the lenses fog up. To avoid fog from the lenses most ski goggles have two lenses. Together with an anti-fog coating, this can prevent annoying fogging.

NAKED Optics Insider Tip: The ski goggles The STORM provides a super anti-fog coating. This makes the goggles 300% more resistant fogging up than the other models

Are polarized lenses better?

When talking about the different kinds of lenses we need to consider polarized lenses as well. On our blog you can read what polarization actually means and which advantages and disadvantages exist.  

Credits: Florian Dorn

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