UV 400 is a form of ultraviolet radiation protection associated with sunglasses. UV 400 protection is considered to provide close to 100 percent protection against harmful ultraviolet rays.
UV 400 protection is supposed to provide protection against 99 to 100 percent of UVA and UVB ultraviolet radiation. It is called UV 400 because it blocks all rays of light up to a wavelength of 400 nanometers. According to Crush Eyes, it is considered the highest form of protection that lenses can provide. UV 400 has a higher level of protection than the European standard of protection, known as EN 1836:2005. This European standard allows for up to 5 percent of 380-nanometer rays to be transmitted through sunglasses.Learn More
Polarized sunglasses have a filter that blocks intense, horizontally polarized light, which causes glare. Polarized lenses are useful for outdoor sports because they reduce glare and make it easier to see clearly. However, seeing glare is desirable when downhill skiing because glare off ice patches warns skiers of the danger.Full Answer >
Polarized sunglasses protect eyes by reducing glare, particularly on the water. These sunglasses help to filter out the light that comes off of surfaces such as water or pavement, which keeps harmful glare from the sun out of the eyes and reduces sun-related squinting.Full Answer >
There are a few methods used to get scratches out of sunglasses, including silver polish, baking soda, toothpaste, glass etching compound and vehicle wax. Some of these methods also work on scratches in eyeglasses.Full Answer >
To repair scratched sunglasses, polish the scratches with baking soda paste and rinse them. Apply brass polish, and rub clear automotive wax on top. This procedure takes about 20 minutes and requires brass polish, baking soda, water, a bowl, a spoon, automotive wax, cotton balls and several soft cloths.Full Answer >