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Sub-conjunctival Haemorrhage

The front, white part of the eye is covered by a transparent membrane called the conjunctiva. The conjunctiva has a rich blood supply. A sub-conjunctival haemorrhage occurs when these tiny blood vessels leak, causing a small amount of blood to gather between the sclera (white eye wall) and conjunctiva. Because these membranes are transparent very small bleeds can look quite dramatic. However, it is very common and will not damage your vision.

Photograph of a severe sub-conj. haemorrhage.
Despite the dramatic appearance no treatment is
usually required.

Symptoms

The eye will look very bloodshot and you may have very mild discomfort or a feeling of something being in the eye.


Causes

Practically all sub-conjunctival haemorrhages occur for no obvious reason and there is no associated illness. They often occur after a bout of severe coughing or sneezing. Occasionally there are associated with high blood pressure and if recurrent bleeds occur it is worth checking your blood pressure.

The bloodshot appearance usually disappears 7 to 14 days without treatment.