Which of the following lenses is known for its high impact resistance?

Polycarbonate lenses are recognized for their high impact resistance, making them an ideal choice for various applications, especially in eyewear for children or individuals in active or hazardous environments. The material from which polycarbonate lenses are made is inherently strong and lightweight, which provides not only superior durability but also excellent protection against high-velocity impacts. This characteristic is particularly important for safety glasses, sports eyewear, and lenses used in environments where there is a risk of injury from flying debris or impact.

Other lens options do offer certain benefits; however, they do not match the level of impact resistance that polycarbonate provides. For instance, CR-39 lenses are lighter and provide good optical quality but lack the same degree of impact resistance. High-index lenses are designed to be thinner and lighter for stronger prescriptions but generally aren’t as impact-resistant as polycarbonate. Standard glass lenses, while providing excellent optical clarity, are more prone to shattering and therefore do not provide the safety benefits seen with polycarbonate lenses.

Thus, polycarbonate lenses stand out clearly as the choice associated with high impact resistance.