Most of the times black eyes are relatively minor which heal of its own in 4 to 5 days.As the bruise
heals,the swelling decreases and colour changes from black and blue to green and yellow.
But sometimes,a black eye can be a warning sign of serious eye or head injury
You must consult the doctor immediately if you develop any of following....
Change in vision
Swelling persisting beyond 48 hours
Behavioural changes or confusion
Fluid draining from nose,ears,mouth etc
in the face or eye socket suggesting any fracture
Other wise do the following
Keep continuing icing till swelling disappears
May take some anti inflammatories like ibuprofen
thrice a day
Keeping head elevated.