In general, your doctor can simply do a physical exam to diagnose a black eye. He or she will check your vision and test the motion of your eye by moving his or her finger in front of your face and asking you to follow the movement with your eyes. The doctor will shine a light into your eyes to assess if your pupil is dilating normally and to look at the inside of your eye for any problems.
The doctor will also examine the bones in your face and around your eye. If he or she suspects you may have fractured any bones or that there might be something inside the eye, you may have an X-ray or CT scan.
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