category 4 sunglasses

We are committed to providing you with the best category 4 sunglasses nz on the market. On our website, we aim to provide you with the most breathtaking and beautiful sunglasses you can find online. To offer our valued customers the most distinctive and beautiful sunglasses from around the world, Koboguide’s experts seek out the worlds most beautiful and unique ear plugs. There are a number of unique types of sunglasses to choose from, including category 4 sunglasses ray ban, category 4 sunglasses oakley and cebe category 4 sunglasses.The category 5 sunglasses we offer come in amazing styles and designs. There are several types of these classic sunglasses available. On KoboGuide, you’ll find the best selection of category 4 sunglasses decathlon. With us, you’ll get incredible discounts you won’t find anywhere else. Our category 4 sunglasses mens are available in a variety of styles. Visit our site today to buy your favorite sunglasses from a wide selection of brands. Buy yours today!

Category 4 Sunglasses

Category 4 sunglasses have dark lenses for use in extreme sun conditions where high glare or intense sunlight is experienced. Category 4 lenses let in less than 8% of light – this makes them suitable for activities like skiing, mountain climbing, high altitude hiking and desert trekking. Models available include photochromic light adjusting sunglasses with lenses that darken to category 4 in intense sun/high glare conditions. Category 4 lenses are also suitable for eyes that are very sensitive to sunlight. Lower down the page is more information about lens categories.

The lens tint category number for eyewear equates to a percentage of the VLT (Visible Light Transmission) – basically how much light the lens lets through, as follows:

  • Category 0: 80-100% VLT
  • Category 1: 46-79% VLT
  • Category 2: 18-45% VLT
  • Category 3: 8-17% VLT
  • Category 4: 3-8% VLT

The following is a general guide to the Categories that apply to different lens colours:

  • Category 0 – Clear lens, light yellow & very pale tints
  • Category 1 – Yellow, pale orange & light amber
  • Category 2 – Orange, rose, red, amber & light brown
  • Category 3 – ‘Standard’ grey & brown sunglass lenses
  • Category 4 – Dark grey & brown sunglass lenses

Almost all the grey and brown lens sunglasses sold on the Sunglasses For Sport website are Category 3 and suitable for use in strong sun conditions.  Category 4 lenses are always clearly identified because they have specific uses e.g. high altitude walking, climbing and skiing. They are also good for anyone that has eyes sensitive to bright light but it’s important to know that you mustn’t use Category 4 lenses for driving (they are too dark for driving and could invalidate your car insurance if worn while driving)


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CategoryCharacteristicsSuitable for…
0Cat 0 lenses are either clear or have a very light tint, they are used for safety glasses or spectacles where you need to see clearly what you are doing. 
1Cat 1 lenses are for casual use, used as a comfort filter in cosmetic and fashion eyewear.Fashion
2Cat 2 lenses are the most common category to be found in sunglasses, for general use they provide good protection from visible light and from UV rays.  This lens will have a tint which allows through less light than category 1 but more light than category 3 General Purpose, watching and taking part in sport
3Cat 3 lenses provide extra protection from both visible and UV light.  These lenses will usually only allow less than 20% of visible light to penetrate the lens.  This means that they will block out 80%+ of light.Open mountain ranges
4Cat 4 lenses provide a high level of protection from visible and UV light.  These lenses are not to be worn when driving as they are too dark.  These lenses will allow less than 10% of light to transmit through the lens.  They are to be used for specific situations only – not for a pair of everyday sunglasses.High altitude trekking and mountaineering.

Clearly there is not a single lens to suit every set of conditions, this is where sunglasses with a range of lenses come in, or photochromic lenses that adapt to the light conditions. READ MORE>

Ultraviolet Light (UV) Protection – Overexposure to ultraviolet light is thought to be a cause of cataracts, retinal damage and other eye problems, so protection from UV rays is an essential function of sunglasses, all our sunglasses offer 100% UV protection, no UV light will pass through the lens.

Visible Light Transmission (VLT) – This is the measure of how much light your sunglass lens lets through to your eye and can be expressed as a percentage, therefore a VLT of 1% means very dark glasses indeed, and a VLT of 100% means all the light is getting through and the lens is therefore a ‘clear lens’.

Rather than quote a percentage for each lens they are categorised as follows:

Lens Categories – The most common lens colour (tint) is Brown, this is because these lenses (along with Grey and Green) are ‘colour neutral’, that is they cut down on overall brightness without distorting colours thereby accentuating relief.


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The Pros & Cons Of Polarized Sunglasses Lenses

If you’re thinking about getting a pair of sunglasses from Designer Optics, you may be wondering whether or not you should get polarized lenses. What are polarized lenses, anyway, and what are their pros and cons?

That’s a great question. So in this blog, we’ll discuss the basics of polarized lenses and how they work, and their benefits and drawbacks. Read on and learn everything you need to know.

What Are “Polarized Lenses” Anyway?

Polarized lenses are sunglasses lenses that are specially built and treated with a special chemical, which acts as a filter for sunlight.

This filter is vertical, which means that only some light can pass through it. Basically, this blocks light approaching from some angles – such as horizontal light – which is a common cause of glare.

This means that polarized lenses are more effective at blocking out glare, which can be very useful in some situations where the sun is very bright – like while operating a boat on the water, or while in the snow.

Understanding The Pros And Cons Of Polarized Lenses

Polarized lenses may be a great choice in some situations, but they have their own pros and cons like any other type of lens. Let’s discuss these now.


  • Blocks glare and helps improve overall visibility in bright sunlight
  • Better visual clarity and contrast in sunny conditions
  • It’s easier to see below the surface of the water, which may be useful when boating or fishing
  • Reduced eye strain for enhanced comfort
  • Superior visual clarity when in dark and shady areas


  • Because of their unique treatment, polarized lenses make it hard to see LCD screens, like cell phone screens, clearly. This can be a problem for some people
  • Polarized lenses are more expensive, due to the special chemicals and treatment process used to create them
  • Some cheaper polarized lenses that use a film-based filter can have durability issues, such as the filter peeling away from the lens material
  • There are some people who find that polarized sunglasses are uncomfortable because of the way they change vision 

Overall, the benefits of polarized lenses make them attractive – particularly to people who drive a lot, fish, or boat, and can benefit from their ability to dramatically reduce glare and improve vision in bright conditions.

However, keep the drawbacks in mind before making your purchase. Polarized lenses may not be right for everyone.

Shop For Standard And Polarized Sunglasses At Designer Optics

If you’re ready to invest in a new pair of shades, Designer Optics is here to help. We offer both non-prescription and prescription lenses, and we offer standard and polarized finishes on most products. Browse our stock now, and get the sunglasses you need to protect your vision and see clearly on bright days. You’re sure to find everything you need.

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