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Black eye: After an eye injury, bruising around the eye will appear within hours if there has been bleeding under the skin around the eye. If you do get a black eye, it can take up to 2-3 weeks to resolve completely. ...Read more.
How long does it take to heal? In many cases, depending on the severity, the cornea will heal completely in 24 to 48 hours, leaving no permanent damage. However, if the pain is severe or persistent, contact an eye doctor to decide if treatment is required.