How polarized lenses work, how they’re made and why you might need them.
Why do we need polarized lenses?
It happens to everyone: the sun right in your eyes is not just annoying, but potentially very harmful under certain conditions. It can happen when you’re driving, playing sport, at the seaside or in the mountains.
To counter this phenomenon, a special technique was conceived called polarization, which reduces the sun’s glare and so improves safety and protects your vision.
Why are we sometimes dazzled by the sun’s rays?
In its natural state, light moves freely through space. When it encounters a reflective surface, such as a metal sheet, a lake, the sea, snow, sand or asphalt, it changes path and is partially reflected. That’s how the annoying phenomenon of glare occurs.
How does the polarizing filter work?
Polarized lenses are distinguished polarized lenses are distinguished from non-polarized lenses, because a film is applied in the manufacturing process with a particular molecular structure that blocks electromagnetic radiation depending on its polarization.
The polarized film is oriented in the lens along a precise polarized axis to stop rays reflected from other directions and to allow, due to its reticular structure, linear light to pass.
In this way, our eyes focus the images more sharply and with better definition, significantly improving contrast and colour perception.
How are polarized lenses made?
Glasses with polarized lenses are made from lenses that contain a polarized film placed between two lenses, and which are then soldered together to make a single lens.The images you see through polarized lenses may appear darker, but objects become clearer and more distinct and details more pronounced and precise.
That is partly why people who wear glasses with polarized lenses say their eyes are less tired after hours in bright conditions, compared to those who don’t use polarized lenses
What’s the difference between a polarized lens and a tinted lens?
Tinted lenses are able to absorb light intensity, reducing its passage into the eye.
Polarized lenses, on the other hand, are able to absorb reflected light, ensuring vision is more comfortable and colour perception sharper.
Eye strain is caused by the fact that the pupils follow the reflected light, resulting in a continual expansion and contraction of the eye.
This eye strain can directly trigger headaches and migraines.
Are all polarized lenses coloured?
Yes, in that the film’s ability to polarize is directly proportional to the film’s percentage and intensity of colour.
The higher the percentage of colour, the higher the lens’ ability to filter reflected rays. The most common colours are Grey, Brown and Green. Darker colours ensure increased polarization.
Do polarized lenses block UV rays?
Yes, all polarized lenses block 400 nanometre UV light (UV400).
We all know how important it is to protect our eyes from ultraviolet radiation, i.e. UV light, to avoid corneal disease and problems and to improve eye comfort.
Who should wear glasses with polarized lenses?
Everyone! Besides the above-mentioned UV protection, and a reduction in the amount of light that penetrates the eye, the real strength of polarized glasses is being able to see clearly without eye strain under the continual torrent of reflected light.
SUMMARY OF THE ADVANTAGES OF POLARIZED LENSES
1. Sharper vision
2. Increased image contrast
3. Protection from UV light
4. Reduced eye strain
5. Reduced glare