Hi there! Thank you for your review!
We have been looking into scratch-resistant lenses but have been unable to find a material that is both UV protective and impact resistant (so it won't shatter into a dog's eyes upon heavy impact). We continue to look into this but dogs are much rougher on goggles than humans are so even a scratch-resistant lens will still scratch when rubbed on the ground, ran through heavy brush, or contacted by other debris. In the meantime, we are working to keep the lenses as low cost as possible so they are easy to replace.