A scratch resistant coating on CR-39 plastic lenses makes them how many times more resistant to abrasion?

A scratch-resistant coating on CR-39 plastic lenses significantly enhances their durability against abrasion. This particular coating can make the lenses approximately 20 times more resistant to scratches compared to untreated CR-39 lenses. The effectiveness of scratch-resistant coatings is measured in terms of their ability to withstand wear and tear from everyday use, thereby providing enhanced clarity and longevity of the lenses. This level of protection is particularly beneficial for individuals who frequently engage in activities that may put their eyewear at risk of damage, such as sports or outdoor activities. Thus, the choice indicating that the coating makes the lenses 20 times more resistant accurately reflects the substantial improvement in durability provided by the coating.