The difference being that glasses are proven to work for basically everyone with astigmatism, near-sightedness, or far-sightsedness (up to a certain point of course. The more extreme cases get no relief from glasses). DAF and maskers have mixed results. Most people see massive improvements immediately, but one big fault with many of these studies is that they focus on clinical settings and have small sample sizes.I know that SpeechEasy especially has mixed evidence. I'm not saying that it doesn't work, but expectations should be tempered.