What can cause vessel damage to the eyes?
Yesterday morning I noticed in the mirror that my left eye was really bloodshot. Looking carefully at it, it seems like a small blood vessel may have broken. Did I do something to cause this? I definitely didn't harm my eyes, to my knowledge; how can I avoid this in the future?
Injected sclera, or red eyes, can come from many different sources. It is important to differentiate conjunctivitis, or inflammation of the white part of the eye, with injection, which is the term used to describe an red eye from any cause. As your question seems to imply no other symptoms, such as decreased vision, itching, pus, or other issues, we'll address injection first (seek medical consultation if you're having those other symptoms). Isolated injection of a single eye implies that something caused a local response. It is generally doesn't have any other symptoms and goes away quickly. It is often caused by some sort of minor trauma, and can even occur while sleeping (such as when you rub your eyes or get something in your eye). If your eye has become less red already and there have been no other symptoms, the odds are good that this is what happened. If it happens repeatedly, doesn't improve, or occurs more frequently than in the past, you should have a physician examine your eye. Inflammation of the eye (conjunctivitis) generally involves itching, discharge, or other eye complaints which sound like more than you had yesterday morning. Such may stem from allergies, infection, or many other things (contact lenses, dry eyes, too little sleep, etc). If you experience discharge, itching, or especially any loss of vision, you should seek medical attention immediately, as they may be symptoms of a more ominous condition. Lubricant eye drops may help to some degree, but medical aid should be sought if the condition does not resolve quickly.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under Zocdoc’s Terms of Service.