A sub-conjunctival haemorrhage is where an eye looks red due to a small bleed underneath the conjunctiva (the transparent layer which lies over the white of the eye). It can look alarming
but usually causes no symptoms, and is usually harmless.
The redness can often look like it is getting worse before the redness starts to clear, usually the eye clears within two weeks. A sub-conjunctival haemorrhage is sometimes called ‘red eye’
due to its appearance.