Have you suffered from all these occasions:
When the sun light or reflected light is too strong that makes you hardly open eyes,
When the sun is low In the Morning and Evening, your face feels hot for the direct sunlight,
When snowy days, your eyes feel dry and can not stop the tears,
When foggy or rainy days, vision is too blur in low visibility conditions?

Eliminate Sun Glare, Reduce Snow Blind, Block UV Rays & Protect Your Eyes with a SAILEAD Polarized UV400 Polycarbonate Sun Visor Extender
What Is Glare?
When a bundle of light hits a flat surface, it becomes polarized, the bundle becomes concentrated and is blinding anyone observing it. Glare typically happens when waves of light bounce off reflective surfaces, such as road, car's bumper or back window, snowy hillside, muddy road,or a patch of ice on the road. No matter what the case, the desired result is to filter out the distracting reflected light and provide a clear viewing experience for the driver.

No more blurry images! No more eye discomfort! No more squinting on the road!  Our polarized and will help eliminate glare on the road. When you enter or leave the tunnel, Light intensity is alternating too fast, polarized lens will give you max benefit

With a hard coating applied to it, it has high impact-resistance and scratch-resistance,in general tends to be safer than regular visor because the lenses are made of polycarbonate materials that are unlikely to shatter if struck and can give you the benefits of both sunglasses and protective eyewear.

Polarized Lens Differences
Inexpensive polarized lenses differ from more expensive lenses in significant ways. Cheaper polarizer may only have a thin chemical laminate on one side of the lens. The thin layer may only provide minimal benefit and the thin layer can be rubbed or scratched off easily.