Here's what nobody told you: your under-eye probably isn't dark. It's low.
As the fat pad underneath thins, the surface drops below the skin around it. And a dip doesn't reflect light, it catches shadow. That's why it's worse under office lighting, worse in photos, worse on video calls, and worse the more concealer you pile on.
Which means every brightening eye cream you've bought was solving the wrong equation. They work on colour. You have a problem of shape.
This is a balm dense enough to cushion the surface and smooth the texture, so the light lands on the area instead of falling into it. That happens the moment you apply it. You can watch it happen in a mirror.
Underneath, the slower work. 5% Volufiline, the patented Sederma complex this entire product category was built on, at the concentration the original research used.