The way a crumb catcher works is pretty much just as it sounds- whereas regular adult bibs are designed to merely protect clothing from falling food, this type actively catches those pieces of food, and collects them within a handy tray at the bottom. In this way, those who have extra difficulty with eating will find that they are no longer dropping large portions of their otherwise perfectly edible meal on the floor, and having to go with smaller portions as a result. They are the perfect way of preventing physical conditions from getting in the way of an enjoyment of food, as no longer does any have to go to waste.
These crumb catchers also makes carers' jobs a lot easier, by cutting down on mess dramatically. Since a regular adult bib will merely deflect the food away from clothing, you may find that after eating, there's a lot of mess left behind. This raises the problem of having to do extra cleaning after meals, but the crumb catcher bib can completely eliminate this problem. Since everything is neatly collected in the built-in tray, all you have to do is empty it afterwards, and you've just saved an enormous amount of cleaning time.
Finally, crumb catchers can go a long way to helping people retain a sense of independence while eating. Normally, they might require someone to help them eat without making a mess, which can be a rather shameful experience, as one of the most basic parts of life is now too much for them to cope with on their own. However, thanks to adult bibs with crumb catchers attached, they will be able to feed themselves without any worry, allowing them to stay proud of who they are, and not rely on others so much.