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" Question On different occasions I&amp;#039;ve had what seems to be a burst blood vessel in both eyeballs.  My eyes became densely bloodshot and felt sore.  The condition cleared up within a couple of days.  I&amp;#039;m taking Warfarin for atrial fibrillations, but regular checks have shown its side-effects to be within the target range.    Answer This sounds a real nuisance, and I can understand your concern.  What you describe is probably a spontaneous subconjunctival haemorrhage.  In this condition a small blood vessel on the surface of the eyeball ruptures forming a very visible bruise.  It&amp;#039;s fairly common and usually settles spontaneously with the weakened blood vessel healing and disappearing.  The Warfarin you take to &amp;#039;thin&amp;#039; the blood could be contributing to the problem.  Although the dose is clearly well controlled it still reduces the blood&amp;#039;s ability to clot and that&amp;#039;s what&amp;#039;s intended.  Mention the problem to your doctor when you have your next check-up, although I think she or he will recommend a policy of wait-and-see.  Yours sincerely  The NetDoctor Medical Team   Other Qs &amp;amp; As Any new information about dry eyes? Blocked nose and eyes - what can I do? Can anything be done about my droopy eyelid? Can anything help with puffy eyes? Corneal dystrophy How can I stop my eyes from watering so much? How does the eye work? I have grey rings in my eyes Inflammation of the eyelids I&amp;#039;ve got a black spot in my eye I&amp;#039;ve got dark patches round my eyes Loss of sight after a stroke My eye has been twitching for months My eyelid is swollen and hurts when I blink My mother-in-law has watery eyes What can I do about my deteriorating eyesight? What can I do to clear bruising under eyes? Why did my eye turn red after I vomited? Yellow eyes   Last updated 29.01.2012 "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.netdoctor.co.uk/ask-the-expert/eyes/a5284/bloodshot-eyes-8211-is-warfarin-to-blame/>