Red eye (patient information)
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Red eye |
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Red eye On the Web |
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Overview
Eye redness is due to swollen or dilated blood vessels, which cause the surface of the eye to look red, or bloodshot.
There are many possible causes of a red eye or eyes. Some are cause for concern; some are medical emergencies. Others are nothing to worry about.
How red the eye appears is often less of a concern than whether you also have eye pain or difficulty seeing.