es with strength work like ordinary reading glasses - just with tinted glass. They are perfect for when you are on holiday in the sun and would like to read a good book or see whats on the menu.
Not everyone knows about the solution, where the ordinary glasses are tinted and UV-protected, so many people wear both a pair of reading glasses and a pair of sunglasses at the same time. If you meet one of them on your way, then spread the message.