Getting blood in your eye is usually not dangerous, but what you should do depends on whether the blood came from inside your own eye (a broken blood vessel) or splashed in from an outside source. A broken blood vessel looks alarming but almost always heals on its own. Blood from another person carries a small but real infection risk that calls for quick action.
Broken Blood Vessel in Your Eye
The most common reason people notice blood in their eye is a subconjunctival hemorrhage, which is a tiny blood vessel that bursts under the clear surface of the eye. It leaves a bright red patch on the white of your eye that can look dramatic but is typically painless. You might not even know it happened until you look in a mirror.
Common triggers include sneezing, coughing, straining, rubbing your eyes, or even sleeping in an awkward position. Sometimes there’s no obvious cause at all. The blood stays trapped under the surface and can’t drip into your eye or affect your vision. Your body reabsorbs it gradually, and the red patch fades over one to three weeks, sometimes shifting to yellow or green as it clears, much like a bruise on your skin.
No treatment is needed in most cases. If the spot feels mildly irritated, preservative-free artificial tears can help with comfort. You can continue wearing contact lenses if you’re not experiencing pain or vision changes. If you get subconjunctival hemorrhages frequently, or you bruise and bleed easily in general, that pattern is worth mentioning to a doctor since it can occasionally signal a blood clotting issue or blood pressure problem.
Someone Else’s Blood Splashed in Your Eye
This is a different situation entirely. The eye’s surface is a mucous membrane, meaning it can absorb fluids, and that creates a pathway for bloodborne infections. If another person’s blood gets into your eye from an injury, a nosebleed, a workplace accident, or any other source, you need to act quickly.
Flush your eye immediately with saline solution, eyewash, or clean running tap water. Use your fingers to hold your eyelids apart and let the water flow across the surface of the eye. If you’re wearing contact lenses, remove them after flushing (not before) so the water can reach as much of the eye’s surface as possible. There’s no universally agreed-upon flushing duration, but continuing for several minutes is reasonable. The goal is to dilute and wash away as much of the blood as possible.
One important exception: if your eye has been cut or punctured, do not rinse it with water. Flushing a punctured eye can push contaminants deeper or cause further damage. In that case, cover the eye without applying pressure and get to an emergency room.
Infection Risk From Blood Exposure
The infections people worry about most after a blood splash are HIV and hepatitis. The actual risk through the eye is low, but not zero.
For HIV, the estimated transmission risk from a single mucous membrane exposure to infected blood is about 0.09%, or roughly 1 in 1,100. That’s far lower than the risk from a needlestick injury, but it’s high enough to take seriously. For hepatitis C, the risk from a blood splash to the eye is believed to be very small, though infection through this route has been documented. Hepatitis B can also be transmitted through mucous membrane exposure, and the risk is higher than for HIV or hepatitis C, particularly if the source person has a high viral load and you haven’t been vaccinated.
The key factor in all of these is whether the source person is actually infected. In many cases, they aren’t, and the true risk drops to zero. But when you don’t know, it’s treated as a potential exposure.
What Happens After a Blood Splash at Work
Healthcare workers and others in high-risk jobs are the most likely to experience a blood splash to the eye. Federal workplace safety regulations classify any contact between blood and the eyes as a formal “exposure incident.” Your employer is required to provide you with a confidential medical evaluation at no cost.
That evaluation involves several steps. The circumstances of the exposure are documented. The source individual’s blood is tested for HIV and hepatitis B (with their consent) to determine whether an actual infection risk exists. Your own blood is drawn for baseline testing so that any future changes can be compared against your status at the time of the exposure. If you’re not ready to be tested for HIV right away, your blood sample must be preserved for at least 90 days, giving you time to decide.
If the exposure is deemed high-risk, you may be offered post-exposure prophylaxis, a course of antiviral medication that can prevent HIV from establishing an infection. This is only effective if started within 72 hours of the exposure, and sooner is better. After 72 hours, it is no longer recommended. Counseling is also part of the follow-up process.
When Blood in Your Eye Needs Medical Attention
For a simple broken blood vessel with no pain and no vision changes, you generally don’t need to see anyone. The situations that do call for a visit include:
- Eye pain: A painless red spot is normal for a subconjunctival hemorrhage. Pain suggests something else is going on, such as increased pressure inside the eye, an infection, or a deeper injury.
- Vision changes: Any blurriness, double vision, or loss of vision alongside bleeding in the eye needs prompt evaluation. Blood inside the eye (not just on the surface) can interfere with vision and may indicate a more serious condition called a hyphema, where blood collects in the front chamber of the eye.
- Trauma: If the bleeding followed a blow to the eye, a foreign object, or any kind of impact, the eye should be examined even if it looks minor on the surface.
- Exposure to another person’s blood: Even after thorough flushing, get a medical evaluation as soon as possible, especially within the first few hours, so that preventive treatment can be started if warranted.
A red patch from a broken blood vessel looks worse than it is and clears up without intervention. But blood from an external source, or blood accompanied by pain or vision problems, calls for a faster response. In those cases, the first few hours matter most.