If someone else’s blood splashes into your eye, the immediate priority is flushing it out with clean water or saline as quickly as possible. The eye’s surface is a mucous membrane, which means it can absorb pathogens from contaminated blood, though the actual risk of infection is low. If the blood in your eye is your own, appearing as a red patch on the white of your eye, that’s a different situation entirely and is usually harmless.
This article covers both scenarios, because people searching this question could be dealing with either one.
Someone Else’s Blood Splashed in Your Eye
This is the more urgent scenario. Blood from another person can carry bloodborne pathogens like HIV, hepatitis B, and hepatitis C. The thin, moist tissue covering your eye (the conjunctiva) can act as an entry point for these infections, though it’s far less efficient at transmitting disease than a needle stick.
The risk numbers are reassuring but not zero. For HIV, the average transmission risk after a mucous membrane exposure (which includes the eyes) is approximately 0.09%, or roughly 1 in 1,100. For hepatitis C, transmission through mucous membrane exposure is considered rare, and no documented cases have occurred through intact skin. Hepatitis B can potentially enter through mucosal surfaces, though specific eye-exposure percentages aren’t well established. Vaccination against hepatitis B eliminates that particular risk.
What to Do Immediately
Flush your eye with clean water, saline, or any sterile irrigant right away. Hold your eye open and let the water run across it for several minutes. If you’re at a workplace that handles blood or body fluids, OSHA requires employers to provide a readily available eye wash station for exactly this purpose. Don’t rub your eye, and don’t use soap or disinfectant in it.
After flushing, the next step depends on the situation. If the blood came from someone whose infection status is unknown, or from a person known to carry HIV, hepatitis B, or hepatitis C, you should seek medical evaluation as soon as possible. Time matters here: post-exposure prophylaxis (PEP) for HIV is only effective if started within 72 hours of exposure, and sooner is better. PEP is not recommended after the 72-hour window has closed.
There is no post-exposure treatment for hepatitis C. Instead, your doctor will set up a testing schedule: a baseline blood test within 48 hours, a follow-up test at 3 to 6 weeks, and a final test at 4 to 6 months to confirm whether transmission occurred.
If It Happened at Work
Workplace blood exposures have a specific process. Under federal OSHA regulations, your employer is required to provide you with a confidential medical evaluation and follow-up immediately after you report an exposure incident. This includes testing, any necessary prophylaxis, and counseling. The exposure should be reported to your supervisor or safety officer right away, and you shouldn’t have to pay for any of the medical care that follows.
If you’ve never been trained on what to do after a blood exposure at your job, that’s itself a gap. OSHA requires employers in covered workplaces to train employees on the procedure for reporting incidents and the medical follow-up available to them.
Your Own Blood Appearing in Your Eye
If you looked in the mirror and noticed a bright red patch on the white of your eye, that’s almost certainly a subconjunctival hemorrhage. It’s a small broken blood vessel beneath the clear surface layer of your eye, and it looks far worse than it is. It doesn’t hurt, doesn’t affect your vision, and resolves on its own within one to two weeks as the blood is reabsorbed.
Common triggers include sneezing, coughing, straining, rubbing your eyes, or even sleeping in an awkward position. Blood thinners and high blood pressure can make these more frequent. No treatment is needed.
When It’s More Serious: Hyphema
A hyphema is different. This is bleeding inside the eye, specifically into the fluid-filled space between the cornea and the iris (the colored part). Instead of a red spot on the white of your eye, a hyphema looks like blood pooling in front of your iris. It’s painful, and it typically follows a direct blow to the eye, like a ball, fist, or airbag impact.
The key differences between the two:
- Subconjunctival hemorrhage: red patch on the white of the eye, painless, no vision changes, no treatment needed.
- Hyphema: blood visible over the colored part of the eye, painful, often causes blurred vision, requires prompt medical care.
Both can occur at the same time after a trauma. If you’ve taken a hit to the eye and see blood anywhere in or around it, that warrants immediate evaluation.
Symptoms That Need Emergency Care
Whether blood entered your eye from an external source or appeared on its own, certain symptoms signal a true emergency. Seek care right away if you experience any change in vision, including blurring or double vision. Eye pain combined with nausea or headache can indicate a dangerous spike in eye pressure or, in some cases, a stroke. Uncontrollable bleeding from or around the eye, or any sign that something has cut or penetrated the eyeball, also requires immediate attention.
A painless red spot on an otherwise normal-feeling eye, with no vision changes, is the one scenario where watching and waiting is perfectly reasonable.