Which type of lenses are popular in sports eyewear due to being lightweight?

The correct answer is that polycarbonate lenses are popular in sports eyewear due to being lightweight. Polycarbonate lenses are made from a type of plastic that is not only lighter than glass but also highly impact-resistant, making them ideal for active sports environments where durability and safety are crucial. Their lightweight nature contributes to comfort during extended wear, as athletes can engage in sports without the added weight on their face.

While glass lenses can provide excellent optical clarity, they are significantly heavier and more prone to shattering, which presents a safety hazard. Traditional plastic lenses are lighter than glass, but they don't offer the same level of impact resistance as polycarbonate lenses. Photochromic lenses, which adjust tint based on UV exposure, may not be specifically recognized for their lightweight properties alone, as their primary function is to provide variable tint rather than enhance lightweight characteristics.

Therefore, polycarbonate lenses stand out in the context of sports eyewear for their combination of lightness, impact resistance, and safety, making them the preferred option among athletes.