A broken blood vessel in the eye is known as a subconjunctival hemorrhage which is bleeding underneath the conjunctiva.
The broken blood vessel in the eye can occur after a sudden or severe sneeze or cough, heavy lifting, straining, vomiting, or even rubbing one's eyes too roughly.
It can also occur as a side effect of eye surgery or blood thinners.
The main symptom is a bright red patch in the eye that may spread and then become green or yellow, much like a bruise.
Usually it disappears within two weeks.
In most cases, no treatment is required for this condition.
Call your doctor if the blood doesn't go away in 2 or 3 weeks, if you also have pain or vision problems, if you have more than one subconjunctival hemorrhage, or if the blood is anywhere inside the colored part of your eye (iris).