Bleeding inside the clear gel that fills the centre of the eye is called a vitreous haemorrhage. When tiny retinal or choroidal vessels rupture, blood drifts into this normally transparent space and vision suddenly clouds with floaters, mist, or a reddish haze.
Knowing what sets these bleeds off is more than academic. A vitreous haemorrhage is often the first sign of diabetic eye disease, retinal tears or other conditions that can steal sight if they are not handled quickly by a specialist. Over the next few minutes you’ll discover how the vitreous is anchored to the retina, the ten most common culprits—from high blood sugar to hockey pucks—who is most at risk, the warning signs that demand urgent care, and how ophthalmologists at Bright Sight Eye Specialists diagnose, treat, and help you prevent a repeat episode. We’ll also set clear expectations about recovery times and the simple lifestyle tweaks that keep your retinas healthy for the long haul.
How Does a Vitreous Haemorrhage Happen?
Blood does not normally mingle with the clear jelly of the eye. For a bleed to develop, something must tug on, pierce, or otherwise weaken a retinal or choroidal vessel so that it leaks into the vitreous cavity. Understanding that chain reaction makes it easier to link each specific cause of vitreous haemorrhage to its underlying mechanism.
The Vitreous Body and Its Neighbours
The vitreous is 99 % water held together by a loose collagen‒hyaluronic acid mesh. It is firmly attached at the optic disc, macula, peripheral retina, and lens capsule. With age, the gel slowly liquefies and contracts, a process called syneresis. When it finally peels away (posterior vitreous detachment) remaining adhesions can yank on retinal vessels or create small tears—prime set-ups for bleeding.
Retinal and Choroidal Blood Supply
Two systems nourish the back of the eye: central retinal vessels that traverse the nerve fibre layer, and a deeper choroidal network rich in capillaries. These capillaries are thin-walled and easily ruptured by traction, ischaemia, inflammation, or mechanical trauma.
From Vessel Rupture to Clouded Vision
Once a vessel breaks, red blood cells diffuse through the liquefied vitreous, scattering light and casting moving shadows (floaters). Dense clots can blanket the macula and cut visual acuity to hand-movements. Small bleeds clear in weeks as macrophages digest the blood; larger, ongoing leaks may linger for months or demand surgical removal.
The Top 10 Triggers of Vitreous Haemorrhage
These ten conditions explain the vast majority of bleeds an ophthalmologist sees in clinic. Spotting which one applies is the first step to fixing the problem—and often to saving sight.
1. Proliferative Diabetic Retinopathy (Most Common Overall)
High glucose starves the retina of oxygen, prompting fragile new vessels to sprout. They snap with the slightest tug, spilling blood into the vitreous. Tight sugar control and timely laser or anti-VEGF injections slash the risk.
2. Posterior Vitreous Detachment with or without Retinal Tear
When the ageing gel pulls away, residual adhesions can rip a retinal vessel or tear the retina itself. A tear adds the extra danger of retinal detachment, so same-day review is vital.
3. Ocular Trauma (Blunt or Penetrating)
A cricket ball, car airbag, or stray tree branch can directly rupture vessels or shear the retina from its base—classic in patients under forty. Safety eyewear is cheap insurance.
4. Retinal Vein Occlusion
Blocked outflow means venous pressure skyrockets, capillaries burst, and blood seeps into the vitreous. Managing blood pressure and cholesterol reduces future events.
5. Retinal Macroaneurysm Rupture
Elderly hypertensive women are predisposed to these balloon-like arterial outpouchings; when they pop, the bleed is often sudden and dense.
6. Neovascular Age-Related Macular Degeneration
Choroidal neovascular membranes can break through the retina and gush into the vitreous. Regular OCT monitoring catches leakage early.
7. Sickle Cell Retinopathy and Other Blood Dyscrasias
Abnormal haemoglobin or platelet function causes retinal ischaemia and brittle neovascular tufts that fracture with minimal stress.
8. Severe Inflammatory Conditions (e.g., Necrotising Uveitis, Eales’ Disease)
Chronic inflammation weakens vessel walls; tuberculosis-related vasculitis is a classic reversible cause of vitreous haemorrhage.
9. Intra-ocular Tumours (e.g., Choroidal Melanoma, Retinal Capillary Haemangioma)
Highly vascular tumours or associated retinal detachments can bleed profusely—an ocular oncologist should be involved.
10. Iatrogenic Causes (Post-surgical or Post-laser)
Cataract extraction, YAG capsulotomy, or retinal laser occasionally nick vessels. Most bleeds are small and settle, but a repeat exam checks nothing more sinister is hiding behind the blood.
Less Common but Still Important Causes
Occasionally the cause of vitreous haemorrhage is a rarer problem that still deserves a spot on the checklist.
Blood-Thinners and Systemic Coagulopathies
Warfarin, DOACs and low platelet counts blunt clotting; even minor traction then lets blood seep into the gel. Dose review prevents recurrences.
Paediatric & Neonatal Conditions
Premature babies with retinopathy of prematurity, or shaken-baby and Terson syndromes, often show dense bilateral bleeds. Urgent retinal care vital.
Valsalva & High-Altitude Retinopathy
Heavy lifting, violent coughing or high-altitude hypoxia spikes venous pressure and bursts perifoveal capillaries. Most clear spontaneously.
Idiopathic Cases
Roughly five percent stay unexplained; careful follow-up can expose a late retinal tear or hidden new vessels.
Who Is Most at Risk?
Not everyone who walks into an eye clinic has the same odds of experiencing a bleed. Age, medical history, and day-to-day habits all influence whether a small tug on a blood vessel turns into a sight-threatening vitreous haemorrhage. Knowing your personal risk profile helps you address the underlying cause of vitreous haemorrhage before trouble strikes.
Age and Life Stage
- Teens – 30s: trauma dominates.
- 40s – 60s: posterior vitreous detachment and retinal tears surge.
- 65 +: diabetes, vein occlusion, and macular degeneration become the main dangers.
Systemic Diseases That Raise Risk
Diabetes, hypertension, sickle cell disease, kidney failure, and blood-thinning medications all make retinal vessels fragile and prone to rupture.
Lifestyle and Occupational Factors
High-impact sports, construction or farming work, smoking, poor diet, and unchecked high blood pressure magnify the chance of a bleed.
History of Eye Surgery or Previous VH
Prior cataract surgery, laser treatment, or an earlier haemorrhage increases the likelihood of recurrent bleeding—regular retinal check-ups are essential.
Recognising Symptoms & When to Seek Immediate Care
A bleed inside the eye rarely announces itself with pain. Instead, vision changes appear suddenly and can be subtle at first. Because a vitreous haemorrhage can mask a retinal tear or detachment, spotting the earliest clues — and knowing when they cross the line into an emergency — is crucial.
Typical Early Warning Signs
- A shower of new floaters that look like spots, cobwebs or pepper flakes
- Blurred or hazy central vision, especially in dim light
- A mild reddish or brown tint to everything you see
- Intermittent shadows that drift as you move your eye
These signs often reflect small amounts of blood dispersing through the gel.
Alarm Symptoms Requiring Emergency Attention
- Bright flashes of light (photopsia)
- A dark curtain or shadow creeping across any part of the visual field
- Sudden, dense loss of vision to hand-motions or worse
- Severe eye pain or headache (may suggest raised pressure or another cause)
If any of these appear, ring your ophthalmologist or present to an eye emergency department without delay.
Why Delay Can Cost Vision
Fresh blood can conceal a retinal tear; untreated, that tear may progress to a detachment, slashing the odds of full visual recovery. Early specialist care within 24–48 hours lets the team seal breaks, stop ongoing bleeding, and start treatment before permanent damage sets in.
How Specialists Diagnose the Source of Bleeding
Even when vision is full of crimson fog, an ophthalmologist has several ways to work out exactly where the blood is coming from and why. Each step builds on the last, narrowing the search until the true cause of vitreous haemorrhage is pinned down and a treatment plan can be drawn up.
Clinical Examination in the Consulting Room
After dilating your pupils, the doctor uses indirect ophthalmoscopy and a slit-lamp lens to inspect every quadrant of the retina, looking for tears, new vessels, or vein occlusion. Eye pressure, lens clarity, and the fellow eye are checked at the same sitting.
Imaging Tests
If blood blocks the view, a B-scan ultrasound maps the retina through the opacity in seconds. Once things clear a little, Optical Coherence Tomography (OCT) and OCT-Angiography reveal macular detail and hidden neovascularisation, while fluorescein angiography highlights leaking or blocked vessels.
Systemic Work-up When Indicated
Lab tests—HbA1c, full blood count, coagulation profile, and sickle screen—plus blood pressure or carotid studies, uncover systemic contributors such as diabetes, anaemia, or hypertension. Addressing these factors lowers the risk of another bleed.
Treatment Pathways & Expected Recovery
Management focuses on two goals: stopping fresh bleeding and dealing with the underlying trigger. Your ophthalmologist weighs the density of the haemorrhage, visibility of the retina, and any co-existing tears or neovascularisation before choosing the least invasive option that still protects sight.
Observation vs Active Intervention
Tiny bleeds that leave a clear view of the retina can be watched. You’ll rest the eye, avoid heavy lifting, and return in a week or two for another look. Vision often improves as blood re-absorbs over 2–6 weeks.
Pharmacological Options
If fragile new vessels are to blame, intravitreal anti-VEGF injections (e.g. aflibercept, ranibizumab) shrink them within days. Inflammatory causes may respond to painless corticosteroid injections. Systemic anticoagulant doses are tweaked with your GP to curb further leakage.
Laser Photocoagulation
Pan-retinal photocoagulation seals oxygen-starved retina in proliferative diabetic retinopathy, while a focal laser can cauterise a macro-aneurysm. Treatment is done under topical anaesthetic; mild gritty sensation and temporary blurred vision are common afterward.
Pars Plana Vitrectomy
A 25-gauge keyhole procedure removes stubborn blood and any traction membranes, then seals retinal breaks. Surgeons often combine it with laser or gas tamponade. Most patients notice dramatic visual clarity within a fortnight, though full recovery can take three months.
Rehabilitation and Follow-up
You may need to sleep face-down after gas fill, use antibiotic drops, and skip contact sports for four weeks. Follow-up OCT or ultrasound confirms the retina remains flat and dry; repeat visits are scheduled at one, three and six months.
Prevention & Everyday Eye-Health Strategies
Small daily choices often decide whether another bleed occurs. The tips below tackle modifiable risks.
Tight Control of Chronic Conditions
Keep HbA1c under 7 %, blood pressure <130/80, and lipids normal—stable numbers toughen delicate retinal vessels.
Routine Eye Checks: How Often and Why
Diabetics need annual retina photos; over-65s every two years; see an ophthalmologist immediately for new floaters or flashes.
Protective Measures
Use certified safety glasses, sports goggles, and wrap-around UV sunnies to prevent impact injuries and light-induced damage.
Nutrition & Lifestyle
Leafy greens, oily fish, regular walks, and quitting cigarettes lower oxidative stress and keep retinal vessels resilient.
The Bottom Line
A vitreous haemorrhage is quite literally a bleed inside the clear jelly of your eye. Diabetes-related new vessels, a sudden posterior vitreous detachment with a retinal tear, and blunt trauma top the list of causes, but any condition that injures or starves retinal blood vessels can trigger the same red cloud. The good news? Most people keep their sight when the underlying cause of vitreous haemorrhage is identified quickly and treated with the right mix of observation, laser, injections or key-hole vitrectomy.
If you notice a shower of new floaters, flashes of light, a curtain in your vision or any abrupt loss of clarity, do not “wait and see”. Book a comprehensive retinal assessment with the team at Bright Sight Eye Specialists in Randwick today. A prompt exam could be the difference between a temporary scare and permanent vision loss.