What are the causes of broken blood vessels in the eye?

Many: The most common cause of a conjunctival hemorrhage is dry eye. This can be worsened by use of anticoagulants such as Aspirin or coumadin (warfarin). Rarely, the burst vessel may be due to extremely high blood pressure or clotting problem. If you have a headache or the hemorrages are recurrent, be seen soon.

Multiple: Depends on which vessels, but usually relates to vessel fragility, neovascularization (weak vessels), increased vascular pressure, trauma, bleeding or clotting problems.