Warm compress can't help you in this case. A blow on eyes can make the capillaries beneath skin broken and bleeding. The capillaries are very fragile, we all know that. The force on eyes could easily make them break. The blood congealed beneath will discolor the skin there, in this way bruise is formed. Warm compress will promote blood flow which makes it bleeding more. Right after the hit, you should apply some ice pad to stop the bleeding and pain. Apply this ice pad for 15 minutes each time. After 2-3 days, you can apply some warm compress now to help the blood circulation and reduce the blood stasis. Apply some tender massage around could help too.