I will try to explain to you the advantages of sunglasses with polarized lenses and non-polarized lenses; and also some curious effect related to this type of lens:
A polarized lens is a type of filter that blocks the light coming in a certain direction. The usual thing in this type of sunglasses is that they are polarized vertically, so that it will block the light that comes at a certain horizontal angle. We start from the basis that the sunlight itself is not polarized (vibrates in all directions) so the glasses will not block it as is. What happens is that when that light is reflected on a horizontal surface (for example the road; especially if it is wet) then the lens does block it.
That is the main advantage of polarized sunglasses: they largely eliminate (not completely; remember that we live in a real world) that reflection of light that causes a lot of visual fatigue at certain times.
To understand it in a much simpler and more practical way, I have prepared this video for you to understand better.
Â Â Â Â – Total protection against UV rays.
Â Â Â Â – Vision without reflections.
Â Â Â Â – Superior sharpness and contrast.
Â Â Â Â – Natural colors.
Â Â Â Â – Reduction of eye fatigue.
Â Â Â Â – Light and resistant lenses that provide more comfort and safety.
Â Â Â Â – Suitable also for people with high sensitivity to light.
Â Â Â Â – They exist with and without graduation, even progressive lenses.