I am scared to do injections under my eyes, so I am wondering if Radiesse in my cheeks will also help my eyes?

I think Juvederm or Restylane (or other hyaluronic acid based filler) may be better for under the eyes. However, Radiesse is great for the cheeks.

RADIESSE® is a terrific filler, specifically because of its thick
consistency. This quality also makes it ideal for adding volume to the cheek
area with really beautiful, natural-looking results when you visit a skilled
injector. However, the very qualities that make RADIESSE® so great for other
areas are the same qualities that make it not the best choice under the eyes.
The skin around the eyes is very thin; not only can the RADIESSE® injections be
more apparent there, but the opacity of the substance may actually be visible
through the thin lower eye area skin. I’d recommend the cheek enhancement alone
to see how that affects the under eye area. If you are still unhappy, try a
different filler just under the eyes that is a bit more subtle.

Thanks for the great question. For the midface, cheeks, and under eye areas, I use a combination of different fillers. Radiesse is an excellent choice for building up the cheeks and highlighting the cheekbones. However, it is not an appropriate filler for the under eye area. In this delicate tissue, a thinner product is required. I use either Restylane or Belotero for this area, sometimes called the "tear troughs". In most cases, one 1.5ml syringe of Radiesse and one or two 1ml syringes of Restylane will give a fantastic, natural-appearing result.