Dablims

So howcome the does the layer of film come off after a while? Went riding with the club this weekend and thought the lenses was dirty and when I tried to clean it the film came of. Now the leses is shot. Is there a way that I could get the film off without messing up the lens?

My lenses is dead. The anti fog layer has come off. Where can I get another set of dark lenses? In the Pretoria area. Does any one knows who stocks them?