Floaters in Eye: When to Worry & Signs of Retinal Detachment

Most floaters are harmless — but a sudden change is an emergency. See an eye specialist the same day if you notice a sudden shower of new floaters, flashing lights, or a dark curtain or shadow moving across your field of vision. These can be signs of a retinal tear or detachment, which can be treated successfully if caught early.

Fast answer: when should I worry about floaters?

Long-standing, occasional floaters that drift across your vision and move when you move your eye are almost always harmless. You should seek same-day specialist assessment if you experience any of the following:

A sudden shower of many new floaters appearing at once.
Flashing lights (photopsia), like lightning streaks in the side of your vision.
A dark curtain, veil or shadow spreading across part of your visual field.
A sudden drop in vision in one eye.

Honest one-liner: floaters you have had for years are fine; floaters that arrive suddenly — especially with flashes or a curtain — need checking today, because an early retinal tear can be sealed before it becomes a detachment.

What normal floaters are

Floaters are tiny clumps or strands within the vitreous — the clear gel that fills the back of the eye. As we age the vitreous gel naturally becomes more watery and shrinks, casting shadows on the retina that you see as specks, threads, cobwebs or a small ring drifting across your vision. They are most noticeable against a bright, plain background such as the sky or a white wall.

Very common, especially over the age of 50.
More common, and earlier, in short-sighted (myopic) eyes.
Usually settle and become less noticeable over weeks to months as the brain learns to ignore them.

Red-flag symptoms — get checked the same day

Symptom	What it can mean	Action
Sudden shower of new floaters	Posterior vitreous detachment or retinal tear	Same-day eye exam
Flashing lights (photopsia)	Vitreous pulling on the retina	Same-day eye exam
Curtain / shadow across vision	Retinal detachment in progress	Emergency — same day
Sudden loss of vision	Detachment or other retinal emergency	Emergency — same day

If you cannot reach an eye clinic quickly, attend your nearest eye casualty (eye A&E). A dilated examination of the retina is the only way to rule out a tear.

Posterior vitreous detachment and retinal tears

The most common cause of a sudden increase in floaters and flashes is a posterior vitreous detachment (PVD) — when the shrinking vitreous gel peels away from the retina at the back of the eye. PVD is a normal part of ageing and most often causes no harm. However, as the gel separates it can tug on the retina and, in a minority of cases, create a retinal tear. A tear allows fluid to seep underneath the retina, which can progress to a detachment.

A retinal tear found early can usually be sealed in clinic with laser or freezing (cryotherapy), preventing detachment.
This is why anyone with new floaters and flashes should have a dilated retinal examination promptly.

New floaters, flashes or a shadow in your vision? This needs a same-day dilated retinal examination. Contact us urgently for assessment.

Urgent advice

Retinal detachment — a sight-threatening emergency

A retinal detachment occurs when the retina lifts away from the wall of the eye, like wallpaper peeling off a wall. The classic symptom sequence is flashes, then a shower of floaters, then a dark curtain advancing across the vision from one side. It is painless. Without treatment the detachment spreads and central vision is lost when it reaches the macula.

Urgency: a detachment is a surgical emergency — the sooner it is repaired, the better the visual outcome, especially before the macula detaches.
Treatment: surgery to reattach the retina — vitrectomy, scleral buckle, or pneumatic retinopexy depending on the type.
Higher risk: short-sighted (myopic) eyes, previous detachment in the other eye, recent cataract surgery, eye trauma, or a family history.

What to do — and treatment for troublesome floaters

If your floaters are new, showering, or come with flashes or a curtain, treat it as urgent and get a dilated retinal examination the same day. If a tear is found, prompt laser or cryotherapy can prevent a detachment. If a detachment is found, urgent surgery gives the best chance of preserving vision.

If your floaters are long-standing and benign but persistently troublesome, options after a full assessment can include YAG laser vitreolysis or, in selected cases, a vitrectomy to remove the vitreous — both reserved for floaters that genuinely interfere with daily life.

Frequently asked questions

When should I worry about eye floaters?

Long-standing, occasional floaters are almost always harmless. You should seek same-day specialist assessment if you notice a sudden shower of many new floaters, flashing lights (photopsia), or a dark curtain, veil or shadow spreading across part of your vision, or a sudden drop in vision in one eye. These can be signs of a retinal tear or detachment and need a dilated retinal examination.

What are the warning signs of a retinal detachment?

The classic sequence is flashing lights, then a sudden shower of new floaters, then a dark curtain or shadow advancing across the vision from one side. It is painless. If the detachment reaches the centre of the retina (the macula), central vision is lost. Any of these symptoms is a sight-threatening emergency requiring same-day assessment.

Are floaters and flashes always serious?

No. The most common cause is a posterior vitreous detachment (PVD), a normal age-related separation of the vitreous gel that usually causes no harm. However, in a minority of cases the separating gel tears the retina, so anyone with new floaters and flashes should have a prompt dilated retinal examination to rule out a tear, which can be sealed with laser before it becomes a detachment.

What is a posterior vitreous detachment (PVD)?

A posterior vitreous detachment is when the vitreous gel that fills the back of the eye shrinks and peels away from the retina with age. It typically causes a sudden increase in floaters and brief flashes of light. PVD is usually harmless, but because the separating gel can tug on and tear the retina, a dilated examination is recommended to confirm there is no tear.

Can a retinal tear be treated before it becomes a detachment?

Yes. A retinal tear found early can usually be sealed in clinic with laser or freezing treatment (cryotherapy), which walls off the tear and prevents fluid getting under the retina. This is why prompt assessment of new floaters and flashes matters — treating a tear is far simpler than repairing a full detachment.

Who is at higher risk of retinal detachment?

Risk is higher in short-sighted (myopic) eyes, after recent cataract surgery, after eye trauma, if you have had a detachment in the other eye, or if there is a family history. People in these groups should be especially alert to new floaters, flashes or a curtain in the vision and seek same-day assessment if they occur.

Can troublesome floaters be removed?

Long-standing benign floaters that genuinely interfere with daily life can sometimes be treated after a full assessment with YAG laser vitreolysis or, in selected cases, a vitrectomy to remove the vitreous gel. These options are reserved for floaters that significantly affect quality of life, because all eye procedures carry some risk.

How quickly do floaters settle down?

Harmless floaters from an ageing vitreous usually become much less noticeable over weeks to a few months as the floaters settle lower in the eye and the brain learns to ignore them. If your floaters are stable and not accompanied by flashes or a curtain, this gradual improvement is the typical course.

Sources and methodology

Clinical guidance: Royal College of Ophthalmologists guidance on posterior vitreous detachment, retinal tears and detachment.
Patient information: NHS and RNIB patient resources on floaters and retinal detachment.
Editorial review: reviewed by a UK GMC-registered consultant vitreoretinal surgeon before publication.

Independent sources we reference: NHS floaters and flashes, NHS retinal detachment and Royal College of Ophthalmologists.

Editorial information · not a substitute for personalised medical advice. New floaters with flashes or a curtain in your vision should be assessed the same day by a UK GMC-registered ophthalmologist.

Floaters: when to worry — signs of retinal detachment