Several years ago I replaced the sliding glass door that opens onto my deck. The old doors had glass that was perfectly flat and clear, so much so that at night you could see yourself perfectly in it like a black mirror. I recall my ex-wife used to check her outfit in the "black mirror" just before we'd step out for a night on the town. The new door, which was rather expensive and of high quality has glass that is noticeably distorted, so much so that you can't really even see yourself in it. It's just the way things are these days.