All of the Rex Specs lenses are composed entirely of polycarbonate. They are long-lasting, flexible, and give UVA/UVB protection. They will, however, scratch if subjected to heavy use. Some of our lenses are more resistant to wear and tear than others.
The clear and smoke lenses exhibit the least wear, while the mirror-coated lenses show scratches more clearly. Dogs, unlike humans, are not troubled by scrapes and distortions on the lens; in fact, they have poor short-range vision and can look straight through slight blemishes and imperfections on the lens.