Cucumber on the eyes
Cucumbers have an anti-inflammatory effect that reduces puffiness. The
  vegetable not only has a high water content, it but it's often stored
  in the refrigerator and comes out cold. This means that the water
  hydrates your skin, and the cool temperature decreases the flow of
  blood to the space around your eyes. Together, additional hydration
  and reduced blood flow can sooth the skin around your eyes and
  alleviate swelling


Source

Also it has silica.