Eye Floaters

Small specks, cobwebs, or squiggly lines drifting across your vision are usually harmless. Sometimes they are the first sign of something that needs same-day attention. The only way to know which is a proper assessment.

Illustrative simulation of how floaters appear in a patient’s field of vision. Not a clinical photograph.

What Are Eye Floaters?

Eye floaters are tiny specks, threads, or cobweb-like shapes drifting across your field of vision, most noticeable against a plain background like a clear sky or a white wall. They move as your eye moves and dart away when you try to look straight at them. For most people, they stay a minor visual nuisance rather than a warning sign.

They form inside the vitreous, the gel that fills the back of your eye. As you age, this gel gradually shrinks and liquefies, and small clumps of collagen fibres cast tiny shadows on your retina. This normal process, called vitreous syneresis, explains why floaters become more common from your mid-forties onward.

What matters clinically is whether your floaters are stable or newly changed. Longstanding floaters rarely need treatment. A sudden new shower, together with flashes of light, can signal a posterior vitreous detachment or retinal tear that needs same-day assessment.

Signs Your Eye Floaters Need Urgent Assessment

A sudden increase in the number of eye floaters you notice
New floaters appearing alongside flashes of light
A shower of small dark specks arriving all at once, sometimes described as looking like soot or fine debris
A grey curtain or shadow spreading across part of your vision
Eye floaters that appeared after an eye injury or recent eye surgery
Blurred or reduced vision alongside the floaters
Floaters in someone who is significantly short-sighted, which raises baseline risk

Could it be something else?

Flashes and floaters together can overlap with visual migraine, which produces shimmering zigzag lines and usually clears within an hour. If pain, redness, or light sensitivity came with your floaters, read about red eye; if they developed alongside wider changes in your vision as you’ve aged, see our guide to age-related eye changes. A dilated examination is the only reliable way to tell these apart.

A sudden shower of new floaters, flashes of light, or a curtain-like shadow across your vision can mean the retina is tearing or detaching.

This needs same-day assessment, not a routine appointment booked for next week. Delay can mean permanent vision loss.

What Causes Eye Floaters?

Eye floaters have several distinct causes, ranging from ordinary ageing to conditions that need same-day treatment.

Age-Related Vitreous Changes

The vitreous gel naturally becomes more liquid with age, and the collagen fibres within it clump together and cast shadows on the retina. This is the most common cause by far and explains why floaters become more noticeable from your mid-forties onward.

Posterior Vitreous Detachment

As the vitreous liquefies further, it can pull away from the retina's surface. This often produces a sudden new cluster of floaters and flashes of light. Most cases settle without treatment, but PVD needs an assessment to rule out a related retinal tear.

Retinal Tear or Detachment

A minority of PVD cases pull hard enough on the retina to tear it, and fluid can then seep behind the tear and detach the retina. This is a genuine eye emergency: the sooner Mr Aziz treats it, the more vision he saves.

Inflammation or Bleeding

Less commonly, floaters come from inflammation inside the eye (uveitis) or from small bleeds into the vitreous, sometimes linked to diabetes or high blood pressure. These causes tend to bring other symptoms with them, such as pain, redness, or a hazy patch in your vision.

Most Floaters Are Harmless. A Few Are a Warning Sign.

Two people can describe the same eye floaters and be facing very different situations. One has had the same handful of specks for years and needs nothing more than reassurance. The other has a sudden shower of new floaters that turns out to be an early retinal tear, caught in time because they came in the same day. The floaters themselves can look almost identical. What separates them is what’s happening behind the retina, and that isn’t something you can judge by symptoms alone.

1 Assessment

A dilated examination lets Mr Aziz see right to the edge of your retina, where tears and early detachments typically start and where floaters themselves are invisible without proper equipment.

2 Diagnosis

If anything needs a closer look, imaging such as OCT scanning or ultrasound confirms what’s happening in the vitreous and retina, and rules out the causes that need urgent treatment.

3 Plan

Most patients leave with reassurance and nothing further needed. Where treatment is needed, Mr Aziz sets out the plan, from monitoring to same-day retinal repair, before anything happens.

Treatment Options

Most eye floaters need nothing more than monitoring. When treatment is appropriate, it’s matched to the specific cause found on assessment.

Watchful Waiting

The right approach for the vast majority of eye floaters, particularly longstanding ones that aren't changing. The brain gradually adapts and most people notice them less over time, even though the floaters themselves don't disappear. Come back for review if anything changes.

Laser Vitreolysis

For floaters that are large, persistent, and disruptive to daily life, a laser can break them up and reduce how noticeable they are. This option is reserved for a small subset of cases where the floater's size and position make it realistic.

Urgent Retinal Treatment

Where assessment finds a retinal tear or detachment, laser or surgical repair follows the same day. Timing matters more here than with almost any other eye condition, and the plan moves as quickly as the finding demands.

Frequently asked questions.

Are eye floaters dangerous?

Most are not. Longstanding, stable floaters are usually just a visual nuisance. A sudden change is what needs checking.

Why have I suddenly got more floaters?

A sudden increase often means the vitreous gel has separated from the retina, called a posterior vitreous detachment. It needs an assessment to rule out an associated retinal tear.

Can eye floaters go away on their own?

The floaters themselves rarely disappear for good, but most people notice them less over time as the brain adapts and filters them out.

Should I worry about floaters and flashes together?

Yes, enough to get assessed promptly. Flashes alongside new floaters can signal a posterior vitreous detachment or retinal tear.

What do eye floaters look like?

Small dark specks, threads, cobwebs, or squiggly lines that drift across your vision and are most noticeable against a plain bright background.

Are eye floaters more common as you get older?

Yes. They become significantly more common from your mid-forties onward as the vitreous gel naturally changes.

Can short-sightedness cause eye floaters?

Being significantly short-sighted raises your baseline risk of both floaters and retinal tears, since the eye’s shape puts more strain on the vitreous and retina.

Do eye floaters after cataract surgery mean something went wrong?

Not necessarily. Floaters commonly appear or increase after cataract surgery as the vitreous settles. Any sudden change is still worth an assessment.

What's the difference between a floater and a flash?

A floater is a shape you see drifting across your vision. A flash is a brief streak or spark of light, usually at the edge of your vision, caused by the vitreous tugging on the retina.

Can stress cause eye floaters?

No. Floaters are a physical change in the vitreous gel, not a stress response, though noticing them more during anxious or quiet moments is common.

How is the cause of eye floaters diagnosed?

Through a dilated eye examination, sometimes alongside OCT scanning or ultrasound to check the retina and vitreous in detail.

Is laser treatment for eye floaters available on the NHS?

Laser vitreolysis for straightforward nuisance floaters is rarely funded on the NHS. It’s more commonly accessed privately, and only after assessment confirms it’s an appropriate option.

What happens if a retinal tear is left untreated?

Fluid can seep through the tear and detach the retina, which risks permanent vision loss in the affected area. This is why sudden new floaters need prompt assessment.

Can floaters affect one eye or both?

Usually one eye at a time, though age-related vitreous changes often affect both eyes over time, sometimes months or years apart.

Do floaters mean I need glasses?

No, floaters aren’t a refractive error and glasses won’t change them. They’re unrelated to how well you focus.

How long does a posterior vitreous detachment take to settle?

Most cases settle within a few weeks to a few months, though some floaters from the event can remain permanently, just less noticeable over time.

Can migraine cause floater-like symptoms?

Visual migraine can produce shimmering, zigzag patterns that are sometimes confused with floaters and flashes, but it typically resolves within about an hour and follows a different pattern.

What increases the risk of retinal detachment?

Significant short-sightedness, previous eye surgery or injury, a family history of retinal detachment, and a prior detachment in the other eye all raise the risk.

Should I go to A&E for sudden floaters?

If flashes, a curtain-like shadow, or a sudden shower of floaters appear outside of clinic hours, urgent same-day eye care, whether through A&E, an eye casualty unit, or an emergency ophthalmology appointment, is the right call. Don’t wait for the next routine slot.

What does an eye floaters assessment involve?

A discussion of what you’ve noticed and when it started, followed by a dilated examination of the retina and vitreous, with imaging added if anything needs a closer look.

Not Sure If This Is What You Have?

A specialist assessment will give you clarity — and a plan.