Most cases of blood in the eye involve a subconjunctival hemorrhage, a bright red patch on the white of the eye caused by a tiny broken blood vessel just beneath the surface. This type is harmless and clears on its own within about two to three weeks without any treatment at all. But “blood in the eye” can also mean blood trapped inside the eye itself, and those situations range from uncomfortable to vision-threatening. What actually helps depends entirely on which type you have, and a few of the things people commonly try can make certain types worse.
Figuring Out What Kind of Bleeding You Have
Before you can treat anything, you need to know where the blood is. The eye has several distinct compartments, and blood can show up in different ones for very different reasons. Three types account for almost every case people encounter.
- Subconjunctival hemorrhage: A painless red blotch on the white of the eye, visible on the surface. It looks alarming but does not affect vision. The blood sits between the conjunctiva (the thin clear membrane covering the white of the eye) and the sclera beneath it.
- Hyphema: Blood pooling inside the front chamber of the eye, between the cornea and the iris. You might notice a visible layer of blood settling at the bottom of the iris, blurry vision, and sometimes pain or light sensitivity. This usually follows direct trauma to the eye.
- Vitreous hemorrhage: Blood leaking into the gel-filled cavity behind the lens. You cannot see the blood from the outside. Instead, you notice floaters, hazy or smoky vision, or sometimes a sudden dramatic drop in how well you can see. This is the most serious of the three.
The red patch on the white of your eye that looks like someone painted it with a brush is almost always a subconjunctival hemorrhage and is the type most people are searching about. The other two types need professional evaluation, and the treatment approaches are fundamentally different.
Subconjunctival Hemorrhage and Why It Clears on Its Own
A subconjunctival hemorrhage is a benign condition and one of the most common causes of sudden eye redness.1Clinical Ophthalmology. Subconjunctival hemorrhage: risk factors and potential indicators The blood is trapped in a thin layer right on the surface, and your body reabsorbs it gradually, the same way it reabsorbs a bruise on your arm. No drops, pills, or procedures speed up that reabsorption in any meaningful way. The red patch typically shifts from bright red to yellow-green as the hemoglobin breaks down, and it fades completely over one to three weeks depending on how large the bleed was.
In younger people, the most common triggers are minor trauma and contact lens use. In older adults, systemic vascular conditions like high blood pressure, diabetes, and hardening of the arteries are the more frequent culprits.1Clinical Ophthalmology. Subconjunctival hemorrhage: risk factors and potential indicators Sneezing hard, vomiting, heavy lifting, or straining during a bowel movement can all raise pressure in the small vessels enough to cause a burst. Even vigorous coughing during a cold can do it. In one documented case, breath-hold diving caused subconjunctival hemorrhage from the pressure changes during descent.2PubMed Central. Preventable Diving-related Ocular Barotrauma: A Case Report
The key reassurance here is that a subconjunctival hemorrhage does not affect your vision. The blood is entirely outside the optical pathway. If you notice changes in how well you can see alongside the red patch, something else may be going on, and that warrants a call to an eye doctor.
Cold and Warm Compresses: The One Home Remedy With Support
If you search for ways to clear blood from your eye faster, you will find a lot of suggestions. The one approach with actual clinical use behind it is a simple two-phase compress routine. For the first day or so after the hemorrhage appears, a cold compress applied gently over the closed eyelid can help constrict the broken vessel and discourage further bleeding. After that initial period, switching to warm compresses may help encourage blood reabsorption. In one clinical case of bilateral subconjunctival hemorrhage following delivery, the treatment protocol was a cold compress for the first 24 hours followed by warm compresses applied every two hours.3Vision Science and Eye Health Journal. Bilateral Subconjunctival Hemorrhage (SCH) Following Delivery
The cold-then-warm approach follows the same logic as treating any bruise. Cold limits the initial spread of blood by narrowing the tiny vessels. Warmth later improves local circulation and helps your body clear the pooled blood more efficiently. Whether this actually shortens recovery by days or just by hours is hard to say with precision, since no large randomized trials have tested it head-to-head against doing nothing. But it is safe, it is free, and it is what clinicians actually recommend when patients want to do something rather than just wait.
A few practical notes: use a clean cloth, not ice directly on the skin. Do not press hard against the eye. And avoid rubbing the eye, which can irritate the conjunctiva and potentially extend the bleed.
What Does Not Help
The internet is full of suggestions for clearing blood from the eye that range from harmless-but-useless to actively risky. Eye drops marketed for redness (the ones containing vasoconstrictors like tetrahydrozoline) are designed for bloodshot eyes caused by dilated vessels, not for a hemorrhage. The blood in a subconjunctival hemorrhage is already outside the vessels, pooled under the membrane. Squeezing the vessels tighter does nothing to that pooled blood, and chronic use of redness-reducing drops can cause rebound redness when you stop.
Herbal eye drops and folk remedies like chamomile tea compresses or breast milk have no clinical evidence supporting their use for clearing blood from the eye. Putting unsterile liquids in or around the eye introduces an infection risk with no upside. Aspirin and other blood thinners are another thing to be cautious about: if you are already taking them and you develop a subconjunctival hemorrhage, continuing them as prescribed is usually fine, but popping an aspirin specifically to try to thin the pooled blood and clear it faster is not how blood reabsorption works and could actually predispose you to further bleeding.
When Blood Is Inside the Front of the Eye
A hyphema is a different situation entirely. Blood pooling in the anterior chamber of the eye, the fluid-filled space between the cornea and the iris, usually follows blunt trauma like being hit by a ball, an elbow, or an airbag. It can also happen spontaneously in people on blood thinners or with abnormal blood vessels in the iris. Unlike a subconjunctival hemorrhage, a hyphema can directly block light from reaching the back of your eye and cause significant vision problems.
The main danger with a hyphema is rebleeding, which tends to happen in the first few days. If a second bleed occurs, the rates and severity of complications go up considerably. Those complications can include corneal blood staining, increased eye pressure, damage to the optic nerve, and even permanent vision loss.4PubMed Central. Medical interventions for traumatic hyphema This is why hyphema management focuses heavily on preventing that second bleed.
Treatment options have been studied extensively, and the evidence for most of them is surprisingly thin. A Cochrane systematic review examined interventions including antifibrinolytic drugs (which slow clot breakdown), corticosteroids, pupil-dilating drops, bed rest, head elevation, and eye patching. The review found no strong evidence supporting the use of corticosteroids, pupil-dilating drops, or non-drug approaches like patching, bed rest, or keeping the head elevated for managing traumatic hyphema.5PubMed Central. Medical interventions for traumatic hyphema Antifibrinolytic drugs like aminocaproic acid and tranexamic acid showed some promise in reducing rebleeding, but the evidence linking that to reduced complications was limited by the small number of complication events in the studies.4PubMed Central. Medical interventions for traumatic hyphema
The practical takeaway is that hyphema management is mostly about monitoring and protecting the eye while it heals, not actively “clearing” the blood. Your eye doctor will likely have you avoid strenuous activity, sleep with your head slightly raised, and come back for pressure checks. If the blood does not clear or the pressure in the eye rises dangerously, surgical washout of the anterior chamber may be needed.
Vitreous Hemorrhage: When the Blood Is Deep Inside
Vitreous hemorrhage is the most visually disruptive and potentially serious form of blood in the eye. The blood leaks into the vitreous humor, the clear gel that fills the large cavity behind the lens. Because this gel sits directly in the optical path, even a small amount of blood can scatter light and cause floaters, haziness, or near-total vision loss in severe cases. You cannot see the blood by looking in a mirror; it is entirely internal.
The most common causes in adults are proliferative diabetic retinopathy (where abnormal new blood vessels grow on the retina and bleed easily), retinal tears, and retinal vein blockages. Treatment depends on the cause and severity. Mild cases where the underlying retina is intact are sometimes managed with observation alone, waiting weeks to months for the body to slowly clear the blood.6PubMed Central. Vitreous hemorrhage – Causes, diagnosis, and management
When observation is not enough, or when the eye doctor cannot see through the blood well enough to check the retina, the standard surgical treatment is a pars plana vitrectomy. This procedure removes the blood-filled vitreous gel and replaces it with a clear saline solution or a gas bubble. It remains the cornerstone of vitreous hemorrhage management.6PubMed Central. Vitreous hemorrhage – Causes, diagnosis, and management Other treatment options include laser treatment, cryotherapy, and injections of drugs that target abnormal blood vessel growth.6PubMed Central. Vitreous hemorrhage – Causes, diagnosis, and management
For patients with diabetic eye disease specifically, anti-VEGF injections (drugs that block the growth signal for abnormal blood vessels) have become an important tool, both as a standalone treatment and as a preparation step before vitrectomy surgery.7PubMed Central. The efficacy and safety of intravitreal injection of Ranibizumab as pre-treatment for vitrectomy in proliferative diabetic retinopathy with vitreous hemorrhage By calming down the leaky vessels before operating, the surgeon faces less active bleeding during the procedure. In cases where vitreous hemorrhage recurs after vitrectomy, anti-VEGF drugs combined with a gas exchange procedure in the eye have been used to manage the rebleeding.8International scientific-practical journal Ophthalmology. Results of Anti-VEGF Therapy in the Treatment of Post-vitrectomy Vitreous Hemorrhage in Patients with Proliferative Diabetic Retinopathy
Tissue Plasminogen Activator for Clotted Blood
One specialized treatment worth knowing about is tissue plasminogen activator, or tPA, a clot-dissolving drug that has been studied for use directly inside the eye. When blood inside the eye has clotted and organized into a solid mass, the body’s natural clearing process slows dramatically. Injecting tPA into the affected area can liquefy these clots and help them drain or be absorbed. Research in animal models showed that a single injection of tPA into the vitreous cavity produced a statistically meaningful reduction in vitreous hemorrhage within two weeks, though the clinical effect was described as modest.9JAMA Ophthalmology. Intravitreal Tissue Plasminogen Activator Treatment of Experimental Vitreous Hemorrhage
Where tPA has shown more dramatic results is in treating blood trapped beneath the retina (submacular hemorrhage), which can destroy central vision rapidly if not cleared. In a multicenter study, vitrectomy combined with tPA injected beneath the retina achieved rapid hemorrhage clearance with significant visual improvement and durable results across multiple underlying causes.10PubMed Central. Vitrectomy with Subretinal Tissue Plasminogen Activator for Submacular Hemorrhage: A Multicenter Retrospective Analysis of Functional and Anatomical Outcomes Across Multiple Etiologies The drug has also been used to liquefy organized clots in the space behind the retina before surgical drainage, essentially turning a solid clot into liquid that can be expressed through small incisions.11PubMed Central. Recombinant tissue plasminogen activator in the treatment of suprachoroidal hemorrhage
These are all specialist-performed procedures in a surgical setting, not something you would encounter in an urgent care visit. But they represent the frontier of what “clearing blood from the eye” looks like when the stakes are high and the blood is in a dangerous location.
When You Need to See a Doctor
A straightforward subconjunctival hemorrhage, where you see a painless red patch on the white of your eye but your vision is fine, rarely needs a doctor visit. The exception is if it keeps happening. Recurrent or persistent subconjunctival hemorrhages warrant further evaluation, including a check of your blood pressure, screening for bleeding disorders, and review of any medications that affect clotting.1Clinical Ophthalmology. Subconjunctival hemorrhage: risk factors and potential indicators
You should seek prompt evaluation if any of the following apply:
- Vision changes: Any blurriness, haziness, floaters, or dark spots alongside the red eye.
- Eye pain or pressure: Surface hemorrhages are painless. Pain suggests blood inside the eye or another problem.
- Trauma: If the bleeding followed a blow to the eye, even if everything seems fine, internal damage may not be visible to you.
- Blood thinners: If you take warfarin, direct oral anticoagulants, or even daily aspirin, your doctor should know about eye bleeding in case dosing needs review.
- Blood visible inside the eye: A red layer visible in the colored part of your eye (not on the white) suggests a hyphema and needs same-day evaluation.
The broad rule is simple: if your vision is affected or the eye hurts, get it checked. If the eye looks terrible but sees and feels perfectly fine, you are almost certainly dealing with a surface hemorrhage that will clear on its own.
Preventing Recurrence
For subconjunctival hemorrhages, prevention is often about managing the underlying trigger. If yours was caused by a pressure spike from coughing, sneezing, or straining, treating the cough or constipation addresses the root cause. If you wear contact lenses, ensuring proper fit and hygiene reduces the mechanical irritation that can damage surface vessels. For people who get them repeatedly and have high blood pressure, getting blood pressure under better control is the most impactful change.
Certain activities carry inherent risk. Breath-hold diving, as mentioned earlier, can cause ocular barotrauma from pressure changes during descent.2PubMed Central. Preventable Diving-related Ocular Barotrauma: A Case Report Proper equalization technique while diving helps prevent this. Heavy weightlifting, especially exercises that involve holding your breath against a closed airway, can spike venous pressure enough to cause surface eye bleeds. Learning to breathe through lifts rather than holding your breath reduces the risk.
For deeper types of eye bleeding, prevention depends on the underlying disease. People with diabetes benefit from tight blood sugar control and regular dilated eye exams to catch proliferative changes before they cause a hemorrhage. Those with high blood pressure or blood vessel abnormalities similarly benefit from regular monitoring. The common thread is that most serious intraocular bleeding comes from diseased blood vessels, and managing the disease that weakened them is the most effective prevention.