A This area responds well to filler
There are numerous changes to the face including the bone ( which shrinks) ,loss or hernation of fat pads in the tear troughs.
The skin appears lax because there is insufficient supporting structures
Depending genetics/lifestyle factors this process can be accelerated in some individuals
Dermal filler give great results in this area by
1. provided bony suppert (due to depth of injection)
2.Makes the area less hollow by replacing the fat pads
3.stetches out the skin so the area looks less pigmented and wrinkled
Just make sure you see a doctor who treats these areas well