Black eye
A black eye is when the capillaries beneath the skin
around the eyes have broken, blood enters the
surrounding tissue and discolors it, giving the appearance
of bruising.
Bleeding under conjunctiva (subconjunctival
hemmorhage)
If blood has collected under the conjunctiva, the
transparent tissue that covers the white of the eye, this is
called a subconjunctival hemorrhage. This is not a
dangerous condition, and tends to go away by itself within
a few weeks.
Retinal detachment
When the retina separates from the back of the eye, this is
known as retinal detachment. It is a medical emergency
that can cause partial or total vision loss.