Eye Floaters: Causes, Warning Signs and When to Seek Urgent Eye Care

Author: Dr Val Phua
Estimated reading time: 13–15 minutes

What Are Eye Floaters?

Eye floaters are small shapes that appear to drift through the field of vision.

They may look like:

• Black or grey dots
• Specks
• Threads
• Hairs
• Squiggly lines
• Cobwebs
• Clouds
• Circles or rings
• Small insects moving across the vision

Floaters are not usually objects on the surface of the eye.

Most originate within the vitreous, the transparent gel-like substance filling the large space between the lens and the retina.

Small strands, clumps, cells or particles within the vitreous cast shadows onto the retina. The brain interprets these shadows as objects floating in front of the eye.

Why Do Floaters Move?

Floaters are suspended within the vitreous gel.

When the eye moves:

1. The vitreous shifts.
2. The opacity moves within the gel.
3. Its shadow moves across the retina.
4. The floater appears to drift through the vision.

Floaters may continue moving briefly after the eye stops.

When you try to look directly at one, it often appears to move away because the floater shifts as the eye turns.

Why Are Floaters Easier to See Against a Bright Background?

Floaters are most noticeable when looking at a bright, plain surface such as:

• A blue sky
• A white wall
• A blank computer screen
• White paper
• A brightly lit ceiling

A uniform background provides enough contrast for the floater’s shadow to become visible.

Against a dark, detailed or cluttered scene, the same floater may be much less noticeable.

Are Eye Floaters Common?

Yes.

Most people eventually notice some floaters, particularly as they become older.

A few long-standing floaters that:

• Have not changed
• Are not associated with flashes
• Do not cause a shadow or curtain
• Do not reduce vision

are often related to ordinary age-related changes in the vitreous.

However, new floaters cannot be assumed to be harmless based on appearance alone.

A sudden increase may be the first warning of:

• Posterior vitreous detachment
• Retinal tear
• Vitreous haemorrhage
• Retinal detachment
• Inflammation or infection inside the eye

A dilated retinal examination is required to distinguish these conditions.

What Is the Vitreous?

The vitreous is a clear gel occupying most of the inside of the eye.

It helps maintain the eye’s shape and contains:

• Water
• Collagen fibres
• Hyaluronic acid
• A fine supporting gel network

When a person is young, the vitreous is usually relatively uniform and firmly attached to several areas of the retina.

With ageing, parts of the vitreous gradually become more liquid while collagen fibres aggregate into strands or clumps.

These changes are known as vitreous syneresis.

The aggregates cast shadows on the retina and may become visible as floaters.

What Is Posterior Vitreous Detachment?

A posterior vitreous detachment, or PVD, occurs when the back surface of the vitreous separates from the retina.

As the vitreous ages and becomes more liquid, it contracts and pulls away from its retinal attachments.

PVD commonly occurs after age 50, and its frequency increases with age. It may happen earlier in people with:

• Myopia
• Previous cataract or other intraocular surgery
• Eye trauma
• Inflammation inside the eye

A PVD is usually painless. The most common symptoms are a sudden increase in floaters and flashes of light in the peripheral vision.

Is Posterior Vitreous Detachment the Same as Retinal Detachment?

No.

Posterior Vitreous Detachment

The vitreous gel separates from the surface of the retina.

Most uncomplicated PVDs do not require treatment.

Retinal Detachment

The light-sensitive retina separates from the wall of the eye.

This is a sight-threatening emergency and usually requires laser or surgery.

The concern is that a PVD can sometimes pull hard enough on the retina to create a tear. Fluid may then pass through the tear and lift the retina away from the eye wall.

What Is a Weiss Ring?

The vitreous is firmly attached around the optic nerve.

When it separates from this area during a PVD, a larger circular opacity may become visible.

This is called a Weiss ring.

Patients may describe it as:

• A large ring
• A broken circle
• A curved line
• A spider
• A prominent central floater

The presence of a Weiss ring supports the diagnosis of PVD, but its absence does not exclude PVD or a retinal tear. In one prospective study, approximately one-third of eyes with retinal tears did not have a visible Weiss ring.

What Are Flashes of Light?

Flashes are also called photopsias.

They may appear as:

• Brief arcs of light
• Lightning streaks
• Camera flashes
• Flickers at the side of the vision
• Small sparks

During a PVD, the moving vitreous may pull or tug on the retina.

The retina interprets this mechanical stimulation as light, even though no external light entered the eye.

PVD-related flashes are often:

• Brief
• Recurrent
• Seen in one eye
• More noticeable in darkness
• Located towards the side of the visual field

New flashes—especially when combined with new floaters—require retinal examination.

Are Flashes Always Caused by the Retina?

No.

Visual flashes can also occur with:

• Migraine aura
• Ocular inflammation
• Retinal vascular disease
• Trauma
• Pressure on the eye
• Neurological conditions

Typical PVD Flashes

• Usually affect one eye
• Are brief and lightning-like
• Commonly appear at the side of vision
• May be triggered by eye or head movement

Typical Migraine Aura

• Usually affects corresponding areas of both eyes
• May appear as zigzags, shimmering shapes or a spreading blind spot
• Gradually expands over several minutes
• Commonly resolves within approximately an hour
• May occur with or without headache

A first, atypical or persistent visual disturbance should be assessed rather than assumed to be migraine.

When Are Floaters an Emergency?

Seek urgent eye assessment for:

• A sudden shower of new floaters
• Many new black dots
• New flashes of light
• A dark curtain or shadow
• A missing area of side vision
• Sudden blurred or reduced vision
• Floaters following eye trauma
• New floaters after recent eye surgery
• Floaters with pain, redness or light sensitivity
• New floaters in a highly myopic eye
• New symptoms in an eye with previous retinal tears or detachment

A retinal detachment may be painless.

Do not wait for eye pain before seeking help.

What Does a “Shower of Floaters” Mean?

A shower refers to the sudden appearance of many small dots or specks.

Patients may describe:

• Black pepper
• Soot
• Rain
• A swarm of flies
• Hundreds of tiny dots
• Red or brown spots

This appearance may indicate blood cells or pigment entering the vitreous because of:

• A retinal tear
• Vitreous haemorrhage
• Diabetic retinal bleeding
• Trauma
• Another retinal vascular problem

A sudden shower of floaters requires prompt dilated retinal assessment.

What Does a Curtain or Shadow Mean?

A dark curtain, veil or shadow may indicate that part of the retina has detached.

It may begin:

• From above
• From below
• From either side
• In the peripheral vision
• As a gradually enlarging missing area

The position of the perceived shadow may not match the physical location of the retinal detachment because the retinal image is spatially reversed.

A curtain or shadow is an emergency even when:

• There is no pain
• Central vision remains clear
• The shadow is small
• The symptoms began several days earlier

Retinal detachment can progress and cause permanent visual loss if treatment is delayed.

Does Every New Floater Mean There Is a Retinal Tear?

No.

Most symptomatic PVDs do not cause a tear.

However, the symptoms alone cannot reliably distinguish an uncomplicated PVD from a retinal tear.

A large prospective community study found a retinal tear or detachment in approximately 9.9% of eyes with PVD. A further 3% developed a delayed tear within the following two months despite no tear being identified initially. Rates differ between populations and clinical settings.

This is why:

• The initial dilated examination matters.
• Examination of the far peripheral retina matters.
• Follow-up may be advised.
• New or worsening symptoms require repeat examination.

Can a Retinal Tear Develop After a Normal Initial Examination?

Yes.

A retinal tear may develop while the vitreous is continuing to separate.

The appropriate follow-up interval depends on:

• Examination findings
• Degree of myopia
• Presence of lattice degeneration
• Vitreous haemorrhage or pigment
• Previous retinal tear or detachment
• Symptoms
• Whether the entire peripheral retina was visible

Patients with acute symptomatic PVD are commonly given strict retinal-detachment precautions, and selected patients are re-examined over the following weeks. Regardless of the scheduled appointment, a new shower of floaters, recurrent flashes, blur or a curtain requires immediate reassessment.

What Is a Retinal Tear?

A retinal tear occurs when vitreous traction pulls strongly enough to create a break in the retina.

A tear may allow liquid vitreous to pass underneath the retina.

If enough fluid accumulates, the retina may detach.

A fresh horseshoe-shaped tear associated with vitreous traction is commonly treated to reduce the risk of retinal detachment. Treatment may involve:

• Retinal laser photocoagulation
• Cryotherapy

The treatment creates an adhesive scar around the tear and helps prevent fluid from spreading beneath the retina.

Does Retinal Laser Remove the Floaters?

No.

Laser treatment around a retinal tear seals the retina.

It does not remove the vitreous opacity causing the floater.

A patient may therefore continue seeing:

• The original floater
• Blood-related floaters while haemorrhage clears
• A Weiss ring
• Vitreous strands

The purpose of retinal laser is to prevent a retinal detachment—not to improve the appearance of ordinary floaters.

Who Is at Greater Risk of Retinal Tears or Detachment?

Risk factors include:

• High myopia
• Previous retinal tear or detachment
• A family history of retinal detachment
• Lattice degeneration
• Eye trauma
• Previous cataract or intraocular surgery
• PVD
• Diabetic retinopathy
• Certain inherited or peripheral retinal conditions

Myopic eyes are longer and may have thinner or more vulnerable peripheral retina.

People with these risk factors should respond promptly to new flashes or floaters.

Why Does High Myopia Increase the Risk?

A highly myopic eye is usually longer from front to back.

This may be associated with:

• Earlier vitreous degeneration
• Earlier PVD
• Peripheral retinal thinning
• Lattice degeneration
• Greater susceptibility to retinal breaks
• Higher lifetime risk of retinal detachment

Laser vision correction such as LASIK, PRK or SMILE corrects the focusing error at the cornea.

It does not shorten the eyeball or remove the retinal risk associated with the original high myopia.

Can Cataract Surgery Cause Floaters?

Floaters may become noticeable after cataract surgery because:

• The clearer artificial lens allows existing floaters to be seen more sharply.
• The vitreous may undergo structural changes.
• PVD may occur after surgery.
• Inflammation or bleeding may occasionally contribute.

Previous cataract surgery is recognised as a risk factor for floaters, PVD and retinal detachment. New flashes or a sudden increase in floaters after cataract surgery should be assessed promptly.

Can YAG Laser Capsulotomy Cause Floaters?

YAG posterior capsulotomy treats clouding behind an artificial lens after cataract surgery.

Immediately afterwards, a patient may notice:

• Small floating particles
• Temporary blur
• Previously existing floaters more clearly

New flashes, a marked increase in floaters, a shadow or reduced vision after YAG treatment requires retinal assessment.

Can Eye Trauma Cause Floaters?

Yes.

Trauma may cause:

• PVD
• Retinal tear
• Retinal dialysis
• Vitreous haemorrhage
• Uveitis
• Retinal detachment
• Lens or other internal injury

New floaters after a blow to the eye require assessment even when:

• Vision seems relatively clear
• The eye is not painful
• The redness is mild
• The injury occurred several days earlier

Retinal complications can develop after the initial injury.

Can Diabetes Cause Floaters?

Yes.

Advanced diabetic retinopathy can produce fragile abnormal retinal blood vessels.

These vessels may bleed into the vitreous and cause:

• Dark floaters
• Cobweb-like streaks
• A reddish haze
• Sudden blurred vision
• Severe loss of vision

The bleeding may appear to improve as the blood settles, but the underlying retinal disease still requires treatment.

Diabetic retinopathy can also cause scar tissue that pulls on the retina and produces tractional retinal detachment.

What Is a Vitreous Haemorrhage?

A vitreous haemorrhage is bleeding into the vitreous cavity.

Possible causes include:

• Retinal tear
• Proliferative diabetic retinopathy
• Retinal vein occlusion
• Trauma
• Abnormal retinal blood vessels
• Retinal detachment
• Less common vascular or inflammatory disease

Symptoms may include:

• A sudden shower of dots
• Cobwebs
• Red or brown haze
• Large dark clouds
• Markedly reduced vision

A vitreous haemorrhage can obscure the retinal view.

Ultrasound may be used when the retina cannot be seen clearly, although ultrasound cannot exclude every small retinal tear.

Can Inflammation Cause Floaters?

Yes.

Inflammatory cells inside the vitreous may appear as floaters.

This occurs in conditions such as:

• Intermediate uveitis
• Posterior uveitis
• Panuveitis
• Certain infections inside the eye
• Autoimmune inflammatory disease

Floaters caused by uveitis may be associated with:

• Blurred vision
• Eye pain
• Redness
• Light sensitivity
• Reduced vision

Uveitis can cause permanent visual loss if not treated appropriately.

Can an Eye Infection Cause Floaters?

Yes.

Infections affecting the vitreous or retina may produce:

• New floaters
• Pain
• Redness
• Light sensitivity
• Blurred vision
• Rapid visual reduction

Infection inside the eye may occur after:

• Eye surgery
• Intravitreal injection
• Penetrating injury
• Spread through the bloodstream
• Severe immune suppression

New floaters with pain and worsening vision after an eye procedure require immediate assessment.

Can Floaters Occur After an Eye Injection?

A small air bubble may occasionally enter the eye during an intravitreal injection.

It can appear as:

• A dark circle
• One or more round bubbles
• A shape moving at the bottom of the vision

The bubble usually becomes smaller as it is absorbed.

Pain, worsening redness or deteriorating vision after an injection is not explained by an ordinary air bubble and requires urgent review for possible infection or another complication.

What Is Asteroid Hyalosis?

Asteroid hyalosis is a condition in which many small calcium-containing particles are suspended within the vitreous.

To the examining doctor, they may appear as numerous bright white or golden dots.

Despite their dramatic appearance, asteroid particles are often:

• Relatively stationary
• Minimally symptomatic
• An incidental finding
• More noticeable to the doctor than to the patient

Dense asteroid hyalosis can occasionally affect vision or make examination of the retina more difficult.

Are Floaters on the Surface of the Eye?

Usually not.

Ordinary vitreous floaters cannot be removed by:

• Washing the eye
• Rinsing with saline
• Blinking repeatedly
• Rubbing the eyelid
• Cleaning spectacles

A surface problem may produce mucus strands or tear-film debris, but these behave differently and may clear after blinking.

Do not rub or press the eye in an attempt to move a floater.

Can Floaters Be Seen by Other People?

Usually not without specialised examination.

They are inside the eye and may be visible to the clinician using:

• Slit-lamp biomicroscopy
• Indirect ophthalmoscopy
• Retinal photography
• Ultrasound
• OCT in selected situations

Some floaters are visually troublesome to the patient but difficult to document because their movement and transparency vary.

How Are New Floaters Examined?

Visual-Acuity Testing

Each eye is tested separately to determine whether vision is reduced.

Pupil Examination

The pupil responses are checked for evidence of significant retinal or optic-nerve dysfunction.

Slit-Lamp Examination

The clinician examines the front of the eye and looks for:

• Inflammation
• Red blood cells
• Pigment within the vitreous
• Corneal or lens problems
• Signs of trauma or infection

Pigment cells within the anterior vitreous may be a warning sign of a retinal tear.

Dilated Retinal Examination

Dilating drops enlarge the pupil so the vitreous, optic nerve and retina can be examined.

The far peripheral retina is especially important because many retinal tears occur outside the central field.

The doctor may use:

• A slit-lamp retinal lens
• Indirect ophthalmoscopy
• Scleral indentation or depression

In a prospective study, some retinal tears were identified only during indented indirect examination, supporting careful assessment of the retinal periphery.

Why Does the Doctor Press on the Eyelid?

During scleral indentation, gentle pressure is applied through the eyelid or directly to the anaesthetised surface.

This brings the far peripheral retina into view.

The examination may be uncomfortable but helps detect:

• Small retinal tears
• Horseshoe tears
• Retinal holes
• Lattice degeneration
• Early retinal detachment

Not every patient requires the same examination technique, and the approach depends on symptoms, cooperation and the clinical findings.

Is a Retinal Photograph Enough?

Not always.

Wide-field retinal imaging can be extremely useful, but it may not reliably show:

• Every small tear
• The extreme retinal periphery
• A tear hidden by the eyelid or lashes
• Dynamic vitreoretinal traction
• Subtle elevation around a break

A photograph should support—not automatically replace—a careful dilated clinical examination when acute flashes and floaters are present.

When Is Eye Ultrasound Needed?

Ultrasound may be used when the retina cannot be seen adequately because of:

• Vitreous haemorrhage
• Dense cataract
• Corneal opacity
• Severe inflammation
• Another media opacity

It can help identify:

• Retinal detachment
• PVD
• Vitreous haemorrhage
• Intraocular masses
• Some large retinal tears

A normal ultrasound does not exclude every small retinal break.

Is OCT Used to Examine Floaters?

OCT is not the main test for ordinary peripheral retinal tears.

It may be useful for detecting related conditions involving the macula, including:

• Vitreomacular traction
• Macular hole
• Epiretinal membrane
• Macular oedema

A PVD can occasionally contribute to macular traction, macular holes or later macular pucker.

What Happens If the Examination Shows an Uncomplicated PVD?

If no retinal tear, detachment or other disease is found:

• Treatment is usually not required.
• The patient is given warning symptoms to watch for.
• Follow-up may be arranged according to risk.
• The floaters commonly become less noticeable over the following months.

The floater may:

• Move away from the central visual axis
• Become less dense
• Settle lower within the vitreous
• Be filtered out more effectively by the brain

The PVD itself does not usually require eye drops or surgery.

Do Floaters Go Away Completely?

Sometimes, but not always.

Possible outcomes include:

• The opacity physically shifts away from central vision.
• It breaks into less noticeable pieces.
• Blood or inflammatory material clears.
• The brain gradually learns to ignore it.
• A large ring remains visible indefinitely.

Improvement in awareness does not necessarily mean the floater has disappeared anatomically.

A future sudden change still requires reassessment.

What Is Neuroadaptation?

Neuroadaptation is the brain’s ability to reduce conscious awareness of persistent sensory information.

With time, the brain may become better at ignoring stable floaters, particularly when:

• They are not directly centred
• They are translucent
• They have not recently changed
• The person is not repeatedly searching for them

Floaters may still become noticeable against bright backgrounds or during fatigue.

Can Eye Drops Dissolve Floaters?

There is no established eye drop that safely dissolves ordinary age-related vitreous floaters or treats an uncomplicated PVD.

Drops do not penetrate and reorganise the vitreous collagen in a predictable manner.

Products marketed as “floater-removing drops” should be viewed cautiously.

A drop that dilates the pupil may alter how a floater’s shadow is perceived, but it does not remove the underlying vitreous opacity and may cause other visual or pressure-related effects.

Do Vitamins or Supplements Remove Floaters?

No vitamin or supplement has been proven to remove established vitreous floaters reliably.

A balanced diet supports general eye and vascular health, but supplements cannot:

• Seal a retinal tear
• Reattach a retina
• Clear a vitreous haemorrhage immediately
• Reverse PVD
• Dissolve collagen clumps predictably

Do not delay retinal assessment while trying nutritional products.

Do Eye Exercises Remove Floaters?

No.

Rapidly moving the eyes may temporarily shift a floater away from the visual axis, but it does not remove the opacity.

The floater usually drifts back as the vitreous settles.

Forcefully shaking the head or pressing the eye is not recommended.

Can Ordinary Floaters Be Treated?

Most ordinary floaters are managed conservatively because:

• They commonly become less intrusive.
• They do not usually threaten the retina.
• Treatment carries risks.
• Visual acuity may remain excellent.

Intervention may be discussed when floaters remain:

• Persistent
• Central
• Dense
• Functionally disabling
• Clearly responsible for the symptoms
• Troublesome despite adequate adaptation time

Possible treatments include:

• YAG laser vitreolysis
• Pars plana vitrectomy

The benefits must be weighed against the risks of treating an otherwise healthy eye.

What Is YAG Laser Vitreolysis?

YAG laser vitreolysis directs short laser pulses at selected vitreous opacities.

The aim is to:

• Disrupt the floater
• Reduce its size
• Move it away from the visual axis
• Vaporise parts of a suitable opacity

The procedure is generally performed with:

• A dilated pupil
• Numbing drops
• A specialised contact lens
• A slit-lamp-mounted YAG laser

More than one session may be required.

Is Every Floater Suitable for YAG Vitreolysis?

No.

Suitability may depend on:

• Floater type
• Size
• Density
• Location
• Distance from the retina
• Distance from the lens
• Whether a complete PVD is present
• Clarity of the ocular media
• Patient age
• Whether the symptom matches the visible floater

A discrete, well-defined floater such as a safely located Weiss ring may be more technically accessible than diffuse fine strands near the retina.

How Strong Is the Evidence for YAG Floater Treatment?

Evidence remains limited.

NICE’s current HealthTech guidance states that evidence on the safety and effectiveness of YAG vitreolysis for symptomatic floaters is inadequate in quality and quantity. It recommends that the procedure be used only in the context of research and by retinal specialists experienced in laser surgery and vitreoretinal disease.

Potential complications include:

• Raised eye pressure
• Inflammation
• Lens damage or cataract
• Retinal injury
• Retinal tear or detachment
• Incomplete improvement
• More fragmented floaters

Patients considering laser should understand the uncertainty and available alternatives.

What Is Vitrectomy for Floaters?

Pars plana vitrectomy is an intraocular operation that removes vitreous gel and its opacities using small instruments inserted through the white of the eye.

The removed vitreous is replaced by clear fluid produced and circulated within the eye.

Vitrectomy can provide substantial relief for carefully selected patients with severe symptomatic floaters, but it is more invasive than observation or laser.

How Effective Is Vitrectomy?

A 2022 systematic review involving 2,077 operated eyes found that at least 90% of patients in the included studies were satisfied or experienced symptom relief.

However, the studies varied in technique, follow-up and patient selection. High satisfaction does not eliminate the possibility of serious complications.

What Are the Risks of Vitrectomy for Floaters?

Potential complications include:

• Cataract development or progression
• Retinal tear
• Retinal detachment
• Vitreous haemorrhage
• Macular oedema
• Raised eye pressure or glaucoma
• Infection inside the eye
• Recurrent floaters
• Need for additional surgery
• Rare permanent visual loss

In the 2022 meta-analysis, cataract was the most frequent complication in eyes retaining their natural lens. Retinal tears, retinal detachment and endophthalmitis were less frequent but potentially sight-threatening.

Vitrectomy is therefore generally reserved for symptoms that significantly impair daily function and justify the surgical risk.

Should Young Patients Have Vitrectomy for Floaters?

Caution is particularly important in young patients because they may have:

• Decades of future retinal risk
• An attached vitreous that must be surgically separated
• A healthy natural lens
• Greater concern about cataract development
• Small opacities located close to the retina

The severity of symptoms, anatomy and alternative explanations must be assessed carefully.

Can Floaters Return After Vitrectomy?

They can.

Possible reasons include:

• Residual peripheral vitreous
• New vitreous changes
• Blood or inflammatory cells
• A later PVD when a limited vitrectomy was performed
• New retinal pathology

A new floater after previous vitrectomy still requires assessment if it appears suddenly or is accompanied by flashes or visual-field loss.

Can Floaters Affect Reading and Driving?

Yes, when dense or centrally located.

Patients may report difficulty with:

• Reading small print
• Computer work
• Looking at white screens
• Driving in bright daylight
• Recognising low-contrast objects
• Following a golf or tennis ball
• Performing visually precise work

Standard high-contrast visual acuity may remain 6/6 even when floaters interfere with contrast sensitivity or visual quality.

The impact should be assessed through the patient’s actual function rather than the eye-chart result alone.

Can Floaters Cause Anxiety?

Yes.

New floaters may be worrying because they:

• Move unpredictably
• Resemble insects
• Draw attention repeatedly
• Raise concern about retinal detachment
• Interfere with concentration

A proper dilated examination can distinguish a retinal emergency from uncomplicated vitreous changes.

Once dangerous causes have been excluded, understanding the expected course often helps reduce repeated visual monitoring and anxiety.

Can Stress Create Floaters?

Stress does not usually create vitreous opacities directly.

It may make existing floaters more noticeable because the person:

• Searches for them more frequently
• Spends more time looking at bright screens
• Experiences poor sleep or fatigue
• Becomes more visually vigilant

A new physical floater should not be dismissed as stress without appropriate examination.

Can Screen Use Cause Floaters?

Ordinary screen use does not cause vitreous collagen clumps, PVD or retinal tears.

Screens can make existing floaters more noticeable because:

• The background is bright
• The background is uniform
• The patient concentrates on one visual area
• Dry eye causes additional fluctuating blur

Floaters noticed while using a computer may still require examination if they are new or suddenly increased.

Can Exercise Cause a Retinal Tear?

Ordinary exercise does not generally cause PVD-related retinal tears in a healthy retina.

New symptoms during or after exercise may reveal a PVD or retinal event that was already developing.

Patients with:

• A recent retinal tear
• Recent retinal laser
• Recent retinal surgery
• Acute PVD with concerning findings
• Significant eye trauma

should follow individual advice regarding strenuous activity.

New flashes or floaters after activity require assessment rather than being attributed simply to exertion.

Can Flying Make Floaters Worse?

Commercial air travel does not usually cause ordinary vitreous floaters or retinal detachment.

Different precautions apply when a gas bubble has been placed inside the eye during retinal surgery.

Flying with an intraocular gas bubble can cause a dangerous pressure rise and must be avoided until the bubble has completely disappeared and the surgeon gives clearance.

What If Floaters Appear in the Other Eye?

A PVD in one eye increases the likelihood that the other eye will eventually undergo similar age-related change.

New symptoms in the second eye require a new retinal examination.

A previous normal examination of one eye does not clear future symptoms in:

• The same eye
• The fellow eye

Each new episode should be evaluated according to its own timing and features.

Can Children Have Floaters?

Children may occasionally describe dots or moving shapes, but true symptomatic vitreous floaters are less common than in older adults.

Possible causes include:

• Myopia
• Inflammation
• Trauma
• Retinal disease
• Migraine phenomena
• Entoptic visual effects
• Benign visual awareness

Persistent or new symptoms should be evaluated, particularly when accompanied by:

• Reduced vision
• Redness
• Pain
• Light sensitivity
• Trauma
• Neurological symptoms

A child’s description may be imprecise, so examination is often required to determine what they are experiencing.

Frequently Asked Questions

Are floaters worms or parasites?

Usually not.

Common floaters are shadows produced by vitreous strands or cells.

Rare infections can affect the eye, but they require clinical examination and should not be diagnosed from the floater’s shape.

Why does my floater look like a fly?

The brain interprets the small moving shadow as a familiar object.

Its insect-like appearance does not mean that anything is alive inside the eye.

Why does the floater disappear when I look at it?

The vitreous moves as the eye turns, so the floater shifts away from the retinal area used for direct central vision.

Are transparent floaters safer than black floaters?

Not necessarily.

Colour and transparency alone cannot determine the cause.

The timing, number, associated flashes and retinal examination are more important.

Is one floater an emergency?

A single new floater can occasionally be associated with PVD or a retinal tear.

New onset matters more than the number alone.

Are long-standing floaters dangerous?

Stable long-standing floaters are commonly benign.

A sudden change from the established pattern requires reassessment.

Can a retinal tear occur without flashes?

Yes.

Some patients notice only floaters, blur or a missing visual area.

Others notice no symptoms.

Can retinal detachment occur without pain?

Yes.

Retinal tears and detachments are usually painless.

Can I wait until the next day?

A new shower of floaters, flashes, a curtain, shadow or reduced vision warrants urgent assessment.

Local availability may determine whether this occurs immediately or through an emergency eye service, but it should not be postponed for a routine future appointment.

Why do I still see the floater after retinal laser?

Retinal laser seals the tear but does not remove the vitreous opacity.

Do floaters damage the retina?

Ordinary floaters do not damage the retina.

The underlying process causing a new floater may sometimes damage or tear it.

Can spectacles correct floaters?

No.

Spectacles correct refractive error but cannot remove shadows cast from inside the vitreous.

Do sunglasses help?

Sunglasses may reduce contrast between a floater and a bright background, making it less noticeable outdoors.

They do not treat the underlying cause.

Does closing one eye help identify which eye has the floater?

Yes.

Cover one eye and then the other without pressing on them.

This may help determine which eye is affected, but it should not delay assessment.

Can I drive with floaters?

Stable mild floaters may not prevent driving.

Do not drive when:

• Vision is reduced
• A shadow is present
• Flashes are distracting
• Many new floaters obscure the road
• The pupils remain dilated after examination

Arrange alternative transport for urgent assessment.

Can dry eye cause floaters?

Dry eye causes fluctuating blur, glare or mucus strands on the surface.

It does not usually create true vitreous floaters.

Can cataracts cause floaters?

Cataracts cause haze, glare and blur rather than mobile vitreous shadows.

Cataract and floaters commonly coexist.

Does rubbing the eye move floaters away?

It may shift the vitreous temporarily but does not remove the floater and may injure the eye.

Can floaters burst?

No.

They may fragment, shift or become less noticeable, but they do not burst in the ordinary sense.

Is a black ring dangerous?

A ring may represent a Weiss ring from PVD.

Because PVD can be associated with a retinal tear, a newly appearing ring should be examined.

Can floaters be photographed?

Some can be documented with retinal photography, infrared imaging, OCT or ultrasound.

Others are too translucent or mobile to appear clearly despite being noticeable to the patient.

Should I have routine retinal screening because of floaters?

A new floater requires an initial retinal assessment.

The need for subsequent routine review depends on:

• Retinal findings
• Myopia
• Family and personal retinal history
• Age
• Diabetes
• Previous eye surgery

Can I use old eye drops for new floaters?

No.

Antibiotic, steroid or glaucoma drops do not treat ordinary floaters and may cause harm when used without the correct diagnosis.

A Practical Urgency Guide

Seek Emergency Eye Care

• A curtain or dark shadow
• Sudden visual-field loss
• A sudden shower of floaters
• New floaters with flashes and reduced vision
• New floaters after major eye trauma
• Floaters with severe postoperative pain or redness

Arrange Urgent or Same-Day Assessment

• New persistent floaters
• A new large ring or cobweb
• New flashes
• Floaters in a highly myopic eye
• New symptoms after cataract or YAG surgery
• New floaters with diabetes
• New floaters with redness or light sensitivity

Routine Monitoring May Be Appropriate

• Long-standing unchanged floaters
• Previous complete retinal assessment
• No flashes
• No visual-field defect
• No reduction in vision
• No new symptoms

Any sudden change moves the symptom back into the urgent category.

A Practical Clinical Approach

Step 1: Establish the Timing

• New today
• New within days
• Gradually increasing
• Long-standing and unchanged

Step 2: Identify the Eye

Cover each eye separately without applying pressure.

Step 3: Describe the Floater

• Dot
• Ring
• Cobweb
• Shower
• Haze
• Red or brown cloud

The description helps but does not replace examination.

Step 4: Ask About Associated Symptoms

• Flashes
• Curtain or shadow
• Blur
• Missing vision
• Pain
• Redness
• Light sensitivity

Step 5: Identify Risk Factors

• High myopia
• Cataract surgery
• Recent YAG laser
• Trauma
• Diabetes
• Uveitis
• Previous tear or detachment
• Family history

Step 6: Examine the Peripheral Retina

A dilated examination is required to exclude retinal tears and detachment.

Step 7: Treat the Underlying Cause

Possible management includes:

• Observation for uncomplicated PVD
• Retinal laser or cryotherapy for a tear
• Retinal-detachment surgery
• Treatment of diabetic retinopathy
• Treatment of inflammation or infection
• Vitrectomy for selected severe floaters or non-clearing haemorrhage

Step 8: Provide Return Precautions

The patient should know exactly which new symptoms require immediate reassessment.

Common Myths About Eye Floaters

“All floaters are harmless.”

False.

Most are benign, but a sudden change can indicate a retinal tear, haemorrhage or detachment.

“Retinal detachment always hurts.”

False.

It is usually painless.

“A normal first examination means no future tear can develop.”

False.

A tear can occasionally develop later while the vitreous continues separating.

“Retinal laser removes the floater.”

False.

It seals a retinal break.

“Eye drops dissolve floaters.”

False.

There is no established drop that reliably removes ordinary vitreous opacities.

“Screens create floaters.”

False.

Bright screens make existing floaters more visible.

“Cataract surgery causes every postoperative floater.”

False.

Surgery may make floaters more noticeable or be associated with PVD, but other retinal causes must still be excluded.

“If central vision is clear, the retina cannot be detached.”

False.

A peripheral detachment may initially spare central vision.

“YAG floater laser is proven and risk-free.”

False.

Current evidence remains limited, and retinal or other ocular complications are possible.

“Vitrectomy is a minor operation because the eye looks normal.”

False.

It is intraocular retinal surgery with meaningful potential complications.

The Bottom Line

Eye floaters are shadows cast on the retina by strands, clumps, blood cells, inflammatory cells or other particles within the vitreous.

Most stable age-related floaters are harmless and gradually become less noticeable.

The most important distinction is between:

• Long-standing unchanged floaters
• A sudden new floater or shower of floaters

Sudden floaters may result from posterior vitreous detachment.

Most PVDs are uncomplicated, but some cause:

• Retinal tears
• Vitreous haemorrhage
• Retinal detachment
• Macular traction, hole or pucker

Seek urgent assessment for:

• A sudden increase in floaters
• New flashes
• A curtain or shadow
• Missing peripheral vision
• Sudden blur
• Floaters following trauma or surgery
• Floaters with pain, redness or light sensitivity

Diagnosis usually requires:

• Dilated retinal examination
• Careful examination of the peripheral retina
• Ultrasound when the retinal view is obscured
• OCT when macular traction is suspected

Most uncomplicated floaters require no treatment.

For persistent disabling symptoms, YAG laser vitreolysis or vitrectomy may be discussed, but both require careful patient selection. Vitrectomy is generally more effective but carries intraocular surgical risks. Current NICE guidance regards evidence for YAG vitreolysis as insufficient and recommends its use only within research.

The appearance of a floater matters less than how suddenly it appeared and what came with it. New floaters, flashes or a curtain should be treated as retinal warning symptoms until a dilated examination proves otherwise.

References

1. National Eye Institute. Floaters. Updated December 2024.
2. National Eye Institute. Vitreous Detachment. Updated December 2024.
3. National Eye Institute. Retinal Detachment. Updated November 2025.
4. American Academy of Ophthalmology. Posterior Vitreous Detachment, Retinal Breaks and Lattice Degeneration Preferred Practice Pattern. 2025.
5. Nixon TRW, et al. Posterior Vitreous Detachment and Retinal Tear: A Prospective Study of Community Referrals. Eye. 2024.
6. Jindachomthong KK, et al. Incidence and Risk Factors for Delayed Retinal Tears After an Acute, Symptomatic Posterior Vitreous Detachment. Ophthalmology Retina. 2023.
7. Seider MI, et al. Complications of Acute Posterior Vitreous Detachment. Ophthalmology. 2022.
8. National Eye Institute. Diabetic Retinopathy. Updated September 2025.
9. National Eye Institute. Uveitis. Updated December 2024.
10. National Health Service. Floaters and Flashes in the Eyes.
11. Singapore HealthHub. Common Eye Problems and Their Symptoms.
12. National Institute for Health and Care Excellence. YAG Laser Vitreolysis for Symptomatic Vitreous Floaters. HealthTech Guidance 644. Updated January 2026.
13. Dysager DD, et al. Efficacy and Safety of Pars Plana Vitrectomy for Primary Symptomatic Floaters: A Systematic Review with Meta-Analyses. Ophthalmology and Therapy. 2022.
14. Karunatilake M, et al. Outcomes of Pars Plana Vitrectomy for Visually Significant Floaters. International Journal of Retina and Vitreous. 2025.
15. National Eye Institute. Injections to Treat Eye Conditions. Updated March 2026.