By Jon J. Trutt Published: 9/29/2026 When people hear “plastic lenses,” they don't always think of quality. Plastic can sound cheap. Basic. Maybe even a little old-fashioned. But “plastic” doesn't tell the whole story. And that's exactly why I love CR-39®. It isn't the thinnest lens material. It isn't the most impact-resistant. And it definitely isn't the newest material on the block. But for most standard prescriptions, I think CR-39 offers one of the best combinations of op