Sunglasses vary from cheap to very expensive depending on the different quality and features offered by the lenses. One thing that increases the cost of sunglasses is the quality of the material the lenses are made from. The higher quality lens materials provide much better optics and visual quality. Other features can be added to more expensive lenses that the buyer may find beneficial and worth the additional cost. These include polarized lenses, UV blocking filters, anti-glare and anti-scratch coatings, and safety strength features useful for many worksites.