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Technical
Information

SUNREAD LIFESTYLE TECHNOLOGY

What to think about when selecting Sunglasses

The purpose of wearing sunglasses is for the vast majority of people to be able to see more easily in strong sunlight. It is also important from a protection point of view as strong sunlight can damage the lens of the eye.

You should start using sunglasses from an early age. It is especially important to protect the eye so that you do not get sunburned from reflective surfaces such as snow, water and sandy beaches. When the light is reflected, there can be so much radiation that the retina of the eye can suffer burns.

A pair of sunglasses must have 100% protection against “UV 400″ultra violett light or “UV Rays”which is a non visible light that can damage the eye. UV light can also have a detrimental effect on your eyes, as mentioned earlier. UVA rays can pass through your cornea and into the retina of your eye. Overexposure of this kind can lead to other health problems.

Overexposure to UV light is one of the leading causes of problems including cataracts and photokeratitis.

Bifocal Sunglasses
Reading glasses built into your Sunglasses!

Around the age of 40-45, the focusing lens in the eye, the crystalline lens, begins to become increasingly rigid and less elastic. This results in the lens no longer being able to change position to adapt the eye to vision at different distances. For a person with normal vision, this means that it is difficult to focus at close range while, on the other hand, you can see well at further distances.

However, this can be corrected with the help of reading glasses or bifocal lenses that help us reposition our gaze so that we can see well at different distances. The strength that may be needed in presbyopia to see clearly up close varies between +1.0 to +2.5. If you need more strength than that, there may be other reasons at play and you should ideally visit an optician.

By looking down through the reading box while keeping your head still, you can see clearly up close and then when you look straight ahead, you can see clearly at longer distances. Here you avoid the frustrating change between sunglasses and reading glasses.

Polarisation
(polarised lenses)

Light has properties that differ from other types of wave motion. One of the differences is that light can not only swing up and down and sideways, but in all directions. But it is possible to create light that only swings in one direction. It is called polarising the light. The light must first pass through a polariser, the light becomes plane polarised. If you then put another polariser in front of the first one and turn it 90 degrees, the light will go out. This can be seen by turning polaroid sunglasses 90 degrees towards an LCD screen and it becomes completely black when you look through the sunglasses.

The principle is used for sunglasses. Polarised sunglasses remove troublesome reflections in a sparkling lake or light reflected from a flat surface. The reason this works is that when sunlight is reflected on a water surface, the light becomes polarised (reverses its polarisation 90 degrees). When this light hits a polarising lens, this particular light is not allowed through the lens, which means that the light (reflections) is extinguished.

Sunread Bifocal and non-bifocal Sunglasses are available with both polarised and non-polarised lenses for, for example, pilots who must be able to see reflections from other aircraft and read all types of instruments in their cockpit can not use polarised lenses.

Polarised lenses

Protection and Certification

Sunread Sunglasses are made to pass or surpass Safety glass standard Certification EN 166 F (Europe) and ANSI Z87.1+ (USA). Sunread Sport models are classified as safety glasses according to the European and US standards. With the designation “F” which means that all sport models are tested and approved against high-velocity particles, low-energy impacts (6 mm steel ball at 45 m/s). The European standard requires the user to judge whether this is sufficient for the purpose. This test is also included in the CE certification for safety glasses.

Sunread Sport models are also tested and certified according to the American and international standard ANSI Z87.1+ (American National Standard Institute) with the designation + which means “High impact”. The American standard is only for occupational protection, i.e. 80 different international companies have defined what protection is needed in different situations/occupations and then they have developed tests to check that this protection is achieved with different classifications for protection. For recreational use and when practicing sports, it is up to the user to judge whether the protection is sufficient for the purpose.

UV A – Type A ultraviolet rays have a long wavelength (315-400 nm) and can easily pass through glass. UV A rays also penetrate deep into the skin and cause the pigment we have to darken and give us a deeper tan.

UV B – Rays of type B (280-315 nm) do not penetrate as deeply through the skin but are the ones that cause us to burn. The UVB rays contribute to building up a protective pigment in the skin.

UV C – Rays from the sun never reach the earth, but are already stopped up in the atmosphere.

The human body has an amazing ability to repair damaged cells. Unfortunately, the lens of the eye is an exception and damage to the lens cannot repair itself. It is therefore important to protect your eyes from an early age to avoid problems later in life. In certain environments where the sun’s rays are reflected, you can actually get burns on the retina.

The places where the rays are reflected (bounce) are on snow, sandy beaches and near water such as lakes, otters and seas as well as all flat surfaces with reflective material. There, it is especially important to wear sunglasses with adequate UV protection when you are outdoors in strong sunlight.

A pair of effective sunglasses should filter out both A and B rays completely. A pair of sunglasses that have so-called UV400 protection means that it filters out all UV rays with a wavelength of up to 400 nano meters.

All Sunread models with polarising or non-polarising sunglasses have UV 400 as protection.