What are Undereye Fillers in Singapore? Undereye fillers, also known as tear trough fillers , are a popular non-surgical aesthetic treatment in Singapore  designed to reduce dark circles, eye bags, and hollowness. Using hyaluronic acid-based fillers, the treatment restores lost volume under the eyes, creating a smoother, brighter, and more refreshed appearance. In Singapore, undereye fillers are gaining attention among working adults in their late 20s to 40s who want to look