What causes broken blood vessels in the eye without pain?

Usually dry eyes.: A burst blood vessel should have little to no sensation. Often times patients come to us with a red eye and little else and this is usually due to dry eyes and use of anticoagulants. If you have a burst vessel and persistent headache this can signifiy severe hypertension - get seen today.

Many: Subconjunctival hemorrhages -- older age, trauma / eye rubbing, blood thinners, very high blood pressure, severe valsalva, bleeding or clotting disorder.