Instruct: Classify the given review as either positive or negative.
Query: Good bifocal safety glasses

I now own several pairs of these bifocal glasses, both clear and sunglasses. They work well as safety glasses, and I like the sunglasses for regular use as well, especially for driving. It's nice to have good wrap-around type sunglasses and you can also clearly see the dashboard. Like most safety glasses, they will get scratched up somewhat in the shop and when doing construction work, especially when doing gritty-type work, like concrete or tile sawing and setting. If you take special effort to clean them often in running water, this will extend the usable life substantially.The one failing is that the rubber nose pieces can slide off if you're not careful. Don't loose them down the sink drain. Perhaps this is a manufacturing/ design flaw that Dewalt can correct?