Scratch resistant coating: The plastic lens
material is relatively soft and is easily scratched if it is
not coated with scratch-resistant material. Even with
scratch-resistant coating, your lenses will become scratched
through normal use over time. The coating material is a much
harder plastic compound that is applied to the lens, but it
too can be scratched. Once scratched, a lens cannot be
repaired or “buffed” free of the scratch. Scratch coating
cannot be guaranteed; it is simply added protection from
scratching, and it will inevitably scratch over time.
Ultraviolet protection (UV)
Coating: The sun radiates ultraviolet waves,
which are extremely damaging to the human eye and skin.
Lenses with ultraviolet protection help prevent the harmful
UV radiation from touching your eyes. Polycarbonate,
high-index, photochromic, and polarized lenses all
automatically contain UV protection.
Anti Reflective (AR) Coating
is an extremely thin layer of film that is deposited on
either the front or the back surface of the sunglass lens
that virtually eliminates reflections from the back of the
lens. AR coating makes it easier for other people to see the
wearer’s eyes, and it makes it easier for the wearer to see
through the lens. AR coating is very useful for night
driving and for people who look at computer screens. Lenses
with AR coating must never be cleaned dry, as this can
scratch the coating. The best cleaner is one that is made
especially for AR-coated lenses.
