Which type of lens is known to be the most impact resistant?

Polycarbonate lenses are recognized for their superior impact resistance compared to other lens materials. This characteristic makes them particularly beneficial in environments where safety is a concern, such as in sports eyewear or protective eyewear for industrial applications. Polycarbonate has a unique molecular structure that provides enhanced durability, allowing it to withstand considerable force without breaking.

Additionally, polycarbonate lenses are lighter than glass lenses, which also contributes to comfort, particularly when worn for extended periods. This lightweight feature combined with their high level of impact resistance is why they are often recommended for children's eyewear and safety glasses.

While materials like glass, CR-39, and high-index plastic each have their own advantages such as optical clarity or thinness, they do not match the impact resistance offered by polycarbonate. Glass, for instance, is prone to shattering upon impact, and while CR-39 is known for its optical properties, it is not as durable as polycarbonate. High-index plastics offer a thinner profile for stronger prescriptions but lack the same level of impact resistance as polycarbonate. Therefore, polycarbonate is the clear choice when considering safety and durability in lens materials.