Under eye fillers are used to lighten the tear trough, or under-eye area. They make that area look plumper and brighter. And reducing under-eye shadows can make you look well rested.
In certain cases filler can also be used to fill undereye with bags present as well. This can only be done when the under eye bags are not large enough to grab. In this case fillers can smooth the appearance of under bags. A consultation is always needed before moving forward in order to determine if you are a good candidate or not.