See Things Clearer by Wearing Polarized Sunglasses
Polarised sunglasses are kinds of sunglasses in which it is very useful in avoiding your eyes from being blinded by the glare. As you know, glare is made when the sunlight comes vertically and it is reflected on the flat surface in which the reflection is caught by the eyes. Of course, it is very annoying since you will hardly see all things in front of you. But, you can cope with the glare by wearing sunglasses that is designed to reduce glare and enhance the visibility. The sunglasses work by polarized the light horizontally so that can minimize the glare that you caught.
In some cases, however, polarised sunglasses are forbidden to be worn. For instance, when you are skiing, you are not allowed to wear this kind of sunglasses since it will be very dangerous. By wearing this kind of sunglasses when you are skiing, you will hardly distinguish between the ice and the snow, then. If it happens, of course it is very possible that you can crash yourself to the ice that you cannot see clearly. Therefore, you need to know when you have to wear these sunglasses and when you must put the sunglasses down.
