The only treatment doctors recommend for a black eye is applying a cold object to the affected area, notes WebMD. This reduces swelling and bleeding below the eye. There are home remedies such as applying arnica or oil, but there is no scientific evidence these remedies are effective, reports WikiHow.
When applying an ice pack to the black eye, it should be on for 10 minutes and off for 10 minutes, according to WebMD. People suffering from a black eye must not put pressure on it or try to do anything that may cause further damage.
Applying witch hazel to the eye is another home remedy that some people claim is effective, although there is no proof, states WikiHow.