Which lens material typically provides the best impact resistance for children's eyewear?

Polycarbonate is known for its excellent impact resistance, making it the preferred choice for children's eyewear. Children are particularly active and prone to accidents, which increases the risk of damage to their eyewear and potential injury. Polycarbonate lenses are made from a durable thermoplastic material that can withstand significant force without shattering, proving to be much safer than other lens materials.

In comparison, while heat-treated crown glass and chem-treated crown glass may offer scratch resistance, they are still prone to breaking upon impact, which can create sharp shards that pose a danger. CR-39 lenses, though lightweight and visually clear, also do not match the impact resistance of polycarbonate. Thus, the superior safety features of polycarbonate lenses make them the ideal option for children's eyewear, ensuring both protection and performance in an active environment.