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Materials in relation to coating
Glass lenses are
the most resistant to scratches. However, nothing is scratch proof,
not even glass.
Most lightweight
lenses (high-index,
polycarbonate etc.) are made of
a dense materials (the higher the index the denser the material),
which requires an additional coating to improve its resistance to
scratches. The denser the material the harder the coat is required.
One thing to keep in mind is that the harder the coating the less
the lens will accept tints
Scratch coatings in relation to
Anti-Reflective (A/R) Coatings
Some A/R
coatings are susceptible to scratching easier, however A/R coatings
can be stripped and reapplied eliminating all minor scratches.
Stripping and reapplying A/R coatings does carry a small risk.
During the stripping process lenses may be ruined (becomes foggy
and/or completely opaque) in the process. This process will also not
eliminate deep scratches that are beyond the coatings and into the
actual lens material.
Premium A/R (Anti-reflective)
coatings offer an added layer of scratch coating that repels
smudges, dirt, water spots, streaks, and things of this sort.
Premium A/R
coatings are more durable to scratches than regular conventional
coatings and usually cost more for the technology required to offer
this durability and non-glare performance. |
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