[zx8080]

They probably did not come with scratches, did they?

Don't scratch them. It's simple as that. Wash lens with soap. It's as simple as that.

[Dylan16807]

What, do you think they scratched them on purpose? Avoiding scratching for thousands of hours isn't actually simple, and if some brand is less scratchable then that's a real benefit.

[jjgreen]

Or get glasses made with ... glass?