How we protect our eyes from the sun. It’s as much a part of our lives as the air that We relax in it. We have to protect our eyes from the effect of harsh glare and harmful rays.
How to use your sunglasses.
Category and type of filter such indication (a number and a letter) Can be found on the packing on the bar code as the last two characters on the temple of the glasses such as 2n, 3p, 3n etc.