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A black eye, periorbital hematoma, or a shiner, is ecchymosis (bruising) around the eye commonly due to an injury to the face rather than eye injury. The name is given due to the color of bruising. The so-called black eye is caused by bleeding beneath the skin and around the eye. Sometimes, a black eye indicates a more extensive injury, even a skull fracture, particularly if the area around both eyes is bruised, or if there has been a prior head injury.
Although most black eye injuries aren't serious, bleeding within the eye, called a hyphema, is serious and can reduce vision and damage the cornea. In some cases, abnormally high pressure inside the eyeball (ocular hypertension) also can result.
Presentation and prognosis 
Progression of periorbital hematoma over ten days: the blood is gradually absorbed, but the iron-laden pigments in the blood remain in the tissue leaving a discoloration that persists for longer.
Despite the name, the eye itself is not affected. Blunt force or trauma to the eye socket results in burst capillaries and subsequent haemorrhaging (hematoma). The fatty tissue along with the lack of muscle around the eye socket allows a potential space for blood accumulation. As this blood is reabsorbed, various pigments are released similar to a bruise lending itself to the extreme outward appearance.
The dramatic appearance (discoloration purple black and blue and swelling) does not necessarily indicate a serious injury, and most black eyes resolve within a week.
Unless there is actual trauma to the eye itself (see below), extensive medical attention is generally not needed.
Applying an ice pack will keep down swelling and reduce internal bleeding by constricting the capillaries. Additionally, analgesic drugs (painkillers) can be administered to relieve pain.
Associated conditions 
Eye injury and head trauma may also coincide with a black eye. Some common signs of a more serious injury may include:
- Double vision
- Loss of sight and or fuzzy vision could occur
- Loss of consciousness
- Inability to move the eye or large swelling around the eye
- Blood or clear fluid from the nose or the ears
- Blood on the surface of the eye itself or cuts on the eye itself
- Persistent headache or migraine
- ^ a b c d "Black Eye". NHS Choices. NHS. 18 March 2011. Retrieved 27 October 2012.
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