Here are the symptoms of an orbital blowout fracture:
The most common symptoms are bruising, tenderness and swelling around the eye; redness of the eye; double vision, ordiplopia (seeing two images at the same time); numbness of the cheek, nose or teeth; nose bleeds (epistaxis) [See figure 1].
Symptoms that typically indicate a more serious injury are pain on eye movement, double vision, air under the skin around the eye, and numbness of the cheek/mouth/nose on the side of the injury. Severe trauma may cause facial bone fractures, injury to the eye itself, and injuries to the skull/brain.
In the video taken by an eyewitness immediately after the shooting, officer Darren Wilson is seen walking calmly around the body with no signs of discomfort or injury, even though by this time he would have been in very serious pain.
Also, no ambulance was called for Wilson, and no first aid was administered by other officers, which seems odd if he had indeed suffered this type of serious injury — or any injury at all.