You have probably noticed that some sunglasses have the name “polarized”. They are different from other glasses on the market since they have a polarizing film that reacts to all light conditions and blocks the phenomenon of blinding glare thus improving visual acuity.
In the summer you take precautions about UV rays by putting sunscreen and sunglasses on the beach. However, it must be realized that the UV is not there that during the holidays.
So, see why wearing sunglasses with polarized lenses is an optimal choice
But what are UV rays?
As we all know, the light emitted by the sun is actually energy. This energy also called “electromagnetic spectrum” is in the form of radio waves, X-rays, ultraviolet rays, etc. Our eyes do not see all the waves emitted by this one. Since UV rays contain more energy than visible light rays, the eye may be more damaged by the absorption of UV radiation than by the absorption of any other type of light. For example, UV is not visible as opposed to the blue light that is visible.
When unprotected, the surface of our eye absorbs this energy and this irritates the eye tissues. This can cause permanent damage when the natural ability of the eye to regenerate is highly stressed.
“The energy of the rays is also absorbed by the lens of our eye and it is well demonstrated that a cataract can be formed more quickly by being exposed to UV,” says Karl Brousseau, associate optometrist.
Glare can be very harmful and cause temporary blindness, photokeratitis (corneal burn) or more commonly known as “snow blindness”, loss of visual performance, accidents caused by loss of balance, etc.
Thus, it goes without saying that we must protect our eyes with good glasses, but it is easy to get lost with all the options available on the market.
We are facing UV all year long!
Indeed, the winter we are just as bombarded with UV and that because of the snow which would be a mirror much more effective than the water for example. “The snow reflects the UV with a factor that can go up to 85% whereas the water as opposed reflects UV in an order of 15%”, explains Karl. This is why sports fans such as skiing or water sports often expose themselves to the dangers of blindness.
Light is composed of waves moving in all directions simultaneously. Some of these waves are vertically diffused while others are horizontally diffused. It is the latter who are responsible for the dazzling reflections. When the rays reflect on a flat surface (road, body of water, snow, car windshield, etc.) they generate a dazzling light that disturbs the vision and naturally causes a feeling of discomfort that can easily be dangerous.
The way to limit the effect of glare on our eyes is wearing sunglasses with polarized lenses.
Advantages of wearing polarized lenses
The glare, described above, is reduced by a special filter in the lenses that blocks the reflected light in the horizontal direction. Most unpolarized sunglasses block all light waves (vertical & horizontal). The intensity of the brightness is therefore slightly reduced, but is not completely eliminated. Also, filtering all components of the light greatly reduces visibility.
A polarized lens will allow a vertical beam of light to penetrate while blocking the horizontal beam. This allows us to see clearer, more natural images.
A polarized lens offers several advantages over conventional sunglasses. Here’s why you should opt for polarized lenses:
– Better protection against glare and discomfort
– Better clarity of vision
– A perception of colors and contrast more faithful to reality
– Less eye fatigue