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Vitreous Hemorrhage: Why You May Suddenly See Floaters, Haze, or Cobwebs
A sudden cloud of dark floaters, cobwebs, haze, or shadows in one eye sometimes comes from blood entering the vitreous, the clear gel filling the center of the eye.
This is called a vitreous haemorrhage.
The amount of bleeding varies. A small haemorrhage might look like a few new dark spots or strands. A larger one may cause vision to become cloudy, reddish, or significantly reduced.
Vitreous haemorrhage is usually painless, which makes it easy to underestimate. The bleeding itself is important, but finding why the eye is bleeding matters even more.
Common causes include diabetic retinopathy, retinal tears associated with posterior vitreous detachment, eye trauma, and retinal blood-vessel disease.
1. What is a vitreous haemorrhage?
The vitreous is the clear, gel-like substance filling most of the space between the lens and the retina.
Light normally travels through this transparent gel before reaching the retina.
If blood enters the vitreous, it interferes with the path of light.
Depending on the amount and location of the blood, someone might experience:
a few dark floaters
numerous black dots
cobweb-like shapes
red or brown spots
cloudy vision
a reddish tint
shadows
severe visual haze
A dense hemorrhage sometimes blocks much of the retina from view and causes substantial vision loss.
2. What does a vitreous haemorrhage look like?
Patients describe the symptom in many different ways.
Some say it looks like:
ink floating through the eye
spiderwebs
smoke
dark strands
black dots
a cloud moving through vision
red streaks
pepper scattered across the visual field
The appearance depends on how much blood is present and where it sits within the vitreous.
Unlike ordinary longstanding floaters, vitreous hemorrhage often appears suddenly.
3. Does a vitreous haemorrhage hurt?
Usually, no.
Vitreous hemorrhage often causes sudden, painless visual symptoms.
That does not mean it is harmless.
Several important retinal conditions cause bleeding without producing pain.
A retinal tear, proliferative diabetic retinopathy, or retinal vein occlusion may all lead to blood entering the vitreous while the eye itself feels completely normal.
Sudden visual change deserves attention even when there is no discomfort.
4. Diabetic retinopathy is an important cause
Advanced diabetic retinopathy is one of the major causes of vitreous hemorrhage.
Long-term high blood sugar damages retinal blood vessels.
When the retina receives inadequate oxygen, it sometimes responds by growing new blood vessels. This stage is called proliferative diabetic retinopathy.
These new vessels are fragile.
They may bleed into the vitreous, producing sudden:
floaters
dark spots
cloudy vision
cobwebs
reduced sight
The severity varies from a few specks to a dense hemorrhage obscuring much of the visual field.
Someone with diabetes should not assume sudden dark floaters are ordinary age-related changes.
5. A retinal tear may also cause bleeding
The vitreous naturally changes as we age.
Eventually, it begins separating from the retina in a process called posterior vitreous detachment.
Most posterior vitreous detachments occur without serious complications.
Sometimes, however, the vitreous pulls hard enough to create a retinal tear.
If a retinal blood vessel is torn at the same time, blood enters the vitreous.
This often produces:
sudden flashes
a rapid increase in floaters
dark spots
cobwebs
hazy vision
When vitreous hemorrhage occurs during an acute posterior vitreous detachment, examining the peripheral retina carefully for a retinal tear is especially important.
6. Why a retinal tear matters
A tear creates an opening in the retina.
Fluid may then travel through the tear and underneath the retina.
If enough fluid accumulates, a retinal detachment develops.
Warning symptoms include:
a curtain or shadow over vision
new loss of peripheral vision
increasing flashes
sudden worsening of floaters
rapidly declining vision
This is one reason sudden floaters combined with vitreous bleeding should not be watched at home without examination.
7. Retinal vein occlusion sometimes causes vitreous bleeding
A retinal vein occlusion occurs when a vein carrying blood away from the retina becomes blocked.
Poor blood flow may encourage the retina to grow abnormal new blood vessels.
These vessels are fragile and sometimes bleed into the vitreous.
Someone who has already been diagnosed with a retinal vein occlusion should report:
sudden new floaters
dark haze
new vision loss
a sudden cloud of spots
These symptoms sometimes indicate bleeding or another complication requiring retinal evaluation.
8. Eye trauma is another important cause
A significant impact or injury to the eye sometimes damages retinal or other ocular blood vessels.
This leads to bleeding into the vitreous.
Examples include:
being struck by a ball
blunt trauma
workplace injuries
falls
penetrating injuries
Trauma also increases concern for retinal tears, retinal detachment, or other structural damage.
Sudden vision changes after an eye injury need prompt assessment.
9. Other causes of vitreous haemorrhage
Several less common conditions also lead to vitreous bleeding.
These include:
retinal artery macroaneurysm
abnormal blood vessels related to retinal disease
sickle cell retinopathy
retinal inflammation
some advanced cases of macular degeneration
blood disorders
complications related to other retinal vascular diseases
The underlying cause often depends on age, medical history, previous eye disease, and the appearance of the retina.
This is why vitreous hemorrhage should be treated as a finding requiring diagnosis, rather than as a disease with one single cause.
10. Is it possible to tell blood from ordinary floaters?
Not reliably from symptoms alone.
Ordinary age-related floaters often:
have been present for months or years
remain fairly stable
appear as a few dots or strands
become most obvious against bright backgrounds
Vitreous hemorrhage is more likely to produce:
sudden onset
many new dark spots
dense cobwebs
visual haze
reddish or brownish vision
noticeable reduction in sight
But there is substantial overlap.
A retinal examination is needed to determine whether new floaters come from ordinary vitreous changes, blood, inflammation, or another retinal problem.
11. How is vitreous hemorrhage diagnosed?
The first step is usually a comprehensive eye examination.
Your eye doctor checks:
visual acuity
pupils
eye pressure
the front of the eye
the vitreous
the retina
Dilating the pupil provides a wider view of the retina.
When the hemorrhage is light enough, the retina specialist often identifies the source directly.
With a dense hemorrhage, blood sometimes prevents a clear view.
That is where ultrasound becomes especially useful.
12. Why is eye ultrasound sometimes needed?
A B-scan ultrasound produces an image of structures inside the eye even when blood blocks the doctor's direct view.
It helps look for conditions such as:
retinal detachment
posterior vitreous detachment
some retinal tears
abnormal membranes
other structural problems
This is particularly important when the retina cannot be fully examined through the hemorrhage.
As blood clears, repeated examinations may provide a better view of the retina.
13. Does the blood clear on its own?
Sometimes.
The eye gradually clears blood from the vitreous, but the speed varies considerably.
A small hemorrhage may become less noticeable over time.
A dense hemorrhage sometimes remains for much longer.
More importantly, waiting for the blood to clear is not appropriate until serious underlying causes have been considered.
The key question is not simply:
“Will the blood disappear?”
It is:
“Why did the bleeding happen?”
A retinal tear, retinal detachment, or proliferative diabetic retinopathy needs attention even if the hemorrhage itself eventually becomes clearer.
14. How is vitreous hemorrhage treated?
Treatment depends on the cause.
There is no single treatment for every vitreous hemorrhage.
Retinal tear
A retinal tear often receives laser treatment or another retinal procedure to reduce the chance of progression to retinal detachment.
Diabetic retinopathy
Treatment may involve retinal laser, anti-VEGF injections, surgery, or a combination depending on the extent of disease and bleeding.
Retinal vein occlusion
Treatment focuses on complications such as macular edema or abnormal new blood vessels.
Retinal detachment
A retinal detachment generally requires retinal surgery.
Trauma
Treatment depends on which eye structures were damaged.
This is why identifying the source of bleeding guides everything that follows.
15. When is vitrectomy considered?
A vitrectomy is an operation in which the vitreous gel and blood within it are removed from the eye.
A retina surgeon replaces the vitreous with a clear fluid during the procedure.
Vitrectomy is considered in situations including:
a hemorrhage that does not clear adequately
retinal detachment
certain retinal tears
significant diabetic retinal disease
recurrent bleeding
complications preventing treatment of the underlying retina
The timing varies according to the cause, severity, condition of the retina, and the patient's visual needs.
Not every vitreous haemorrhage requires surgery.
16. Why diabetes control matters
For patients with diabetic retinopathy, managing the eye problem is only part of treatment.
Long-term control of:
blood sugar
blood pressure
cholesterol
supports retinal and overall vascular health.
Regular diabetic eye examinations also help identify retinopathy before severe bleeding develops.
Advanced diabetic retinopathy sometimes progresses without noticeable symptoms until a complication such as vitreous haemorrhage suddenly affects vision.
17. Should you stop aspirin or blood thinners?
Do not stop a prescribed blood thinner because of new eye bleeding unless the clinician managing the medication tells you to do so.
Blood-thinning medications sometimes influence the amount of bleeding from an existing problem, but they are often being taken for important cardiovascular reasons.
Current ophthalmic guidance does not support routinely stopping medically necessary anticoagulant or antiplatelet treatment solely to clear vitreous haemorrhage.
Your retina specialist and the clinician prescribing the medication should guide any changes.
When should sudden floaters or haze be checked?
Arrange prompt eye care if you develop:
a sudden shower of new floaters
new cobwebs
dark spots appearing suddenly
unexplained haze in one eye
reddish or smoky vision
a significant sudden reduction in vision
new symptoms after an eye injury
sudden visual changes if you have diabetes
The symptoms do not need to be painful to deserve evaluation.
When is it an emergency?
Seek urgent eye care for:
a curtain or shadow across vision
sudden loss of peripheral vision
severe sudden vision loss
flashes combined with many new floaters
sudden symptoms following significant eye trauma
These signs raise concern for retinal tear, retinal detachment, or another acute retinal problem.
What this means for your eyes
Vitreous hemorrhage means blood has entered the clear gel inside the eye.
It often appears as sudden dark floaters, cobwebs, haze, shadows, or reduced vision.
The bleeding itself sometimes clears, but the underlying cause is the more important issue.
Diabetic retinopathy, retinal tears, posterior vitreous detachment, trauma, and retinal vascular conditions are among the major causes.
A retinal examination helps determine where the blood came from and whether treatment is needed to protect vision.
Book with South Bay Retina
If you suddenly notice a cloud of floaters, dark cobwebs, visual haze, or unexplained vision loss in one eye, schedule a retinal evaluation with South Bay Retina.
If the symptoms include a curtain or shadow, sudden peripheral vision loss, or severe abrupt vision loss, seek urgent eye care.
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