If you have hard resin lenses (CR-39), you should consider getting a scratch-resistant treatment. Resins and plastics are more susceptible to scratches than glass. Scratches damage the cosmetics of the lenses and compromise their visual performance. With a scratch-resistant treatment, you do not have to worry as much about minor scratches on your lenses.
Another advantage of a scratch-resistant treatment is that most come with a one-year warranty. They are a great investment to prevent minor scratches. However, it is important to remember that scratch-resistant does not mean scratch-proof! All lenses are susceptible to scratches.
