This NHS content is written for people in England. Services, contact routes and treatment arrangements may differ in other countries.
Symptoms of floaters and flashes
Floaters in your vision can look like:
- small dark dots
- squiggly lines
- rings
- cobwebs
Flashes look like sudden flashes of light.
They're usually harmless and not a sign of anything serious, especially if:
- you've had them for a long time
- they're not getting worse
- your vision is not affected
Flashes may eventually stop, and floaters often become less noticeable as you get used to them.
Ask for an urgent opticians appointment or get help from NHS 111 if:
- you have floaters or flashes in your vision for the first time
- you suddenly get floaters or flashes in your vision
- the number of floaters or flashes suddenly increases
- you have a dark "curtain" or shadow moving across your vision
- you also have blurred vision
- you also have eye pain
- floaters start after eye surgery or an eye injury
These could be signs of a serious problem with the back of your eye, which could permanently affect your vision if it's not treated quickly.
You can call 111 or get help from 111 online .
What happens at your appointment
If you have problems with floaters or flashes in your vision your eyes will be checked at an opticians to see if you need to be seen by an eye doctor (ophthalmologist) for more tests or treatment.
You'll usually only need treatment if you have a problem that could affect your vision.
Causes of floaters and flashes
Lots of people, particularly older people, get floaters and flashes.
They're usually caused by a harmless process called posterior vitreous detachment (PVD), where the gel inside your eyes changes.
Sometimes they can be caused by retinal detachment.
This is serious and can lead to permanent vision loss if not treated.
Floaters and flashes can also happen for no obvious reason.
Floaters and flashes in the eyes
Floaters and flashes in the eyes
Floaters and flashes in the eyes
Floaters are small shapes in your vision, such as dots and lines. Flashes are when you see sudden, unexplained flashes of light.
Floaters and flashes can happen for no reason or just appear as you get older. Sometimes they’re due to a serious condition called retinal detachment.
Your eyes will be checked to see if the floaters or flashes could be caused by anything serious. You may be referred to an eye doctor for treatment.
Content supplied by the NHS website, refreshed 19 August 2026. View the original NHS article ↗
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