My child sees spots floating in their eyes: floaters, flashes and when to go today
He says there is a hair or a bug in his eye, and you cannot see anything. Here is what floaters are, why children notice them against the sky or a white screen, and the short list of signs that mean an eye doctor today.
- Floaters are small shadows from tiny clumps of gel or cells in the vitreous, the jelly inside the eye. They look like specks, dots, circles, lines or cobwebs, and they move when the eye moves.
- Children notice them against a plain bright background such as the sky or a white screen, and often call them bugs, dust or hair.
- In a child I do not assume they are harmless: a first report is worth one proper look at the back of the eye.
- Go the same day for a shower of new floaters, flashes of light, a shadow or grey curtain over part of the sight, any spot after a knock to the eye, or spots with pain or redness.
- A very short-sighted child carries a higher risk of a retinal tear, so these signs matter more.
He rubs his eye, looks up at the ceiling light and says there is a hair floating in it. You look closely. There is no hair, no lash, nothing. Later he tries the blue sky from the car window and says it is still there, and that it slides away when he moves his eye. Parents describe this to me in many wordings: a bug, dust, a little worm, a string.
This page is about what those specks usually are, why a child sees them against the sky or a white screen, and the short list of features that turn "mention it at the next visit" into "go today".
What are the dots, specks and threads my child sees floating in their eyes?
They are called floaters. The American Academy of Ophthalmology describes them as "small specks, dots, circles, lines or cobwebs in your field of vision", made by "tiny clumps of gel or cells inside the vitreous that fills your eye". The vitreous is the clear jelly in the middle of the eye. A clump in it casts a faint shadow on the retina, the light-sensing layer at the back, and that shadow is what your child sees.
Because the speck sits inside the eye, it moves when the eye moves and drifts on for a moment after the eye stops. You cannot see it from outside, which is why you looked and found nothing. The action: ask your child to point to where it is and whether it is in one eye or both, then read on.
Why does my child only notice them against the sky or a white screen?
A plain, bright background shows them up. The American Academy of Ophthalmology says you "usually notice floaters when looking at something plain, like a blank wall or a blue sky". A white phone screen, a white page or a bright ceiling does the same job. Against a busy picture the shadow is lost.
Children often have the words "bugs", "dust" or "hair" long before they have the words "something inside my eye". A quick way to sort a floater from a mark on a pair of glasses: wipe the lenses, then ask your child to look at the sky with and without them. A smudge stays fixed to the lens. A floater drifts with the eye. The action: write down what your child says in their own words, because that description helps me more than any guess.
Are floaters in a child harmless?
Many are small specks that need nothing. But I do not assume it in a child, and neither does the Academy. Its page for parents says: "Multiple new floaters or floaters that are accompanied by flashing lights or a curtain of vision loss could be a sign of a retinal tear or inflammation inside the eye." In an adult, floaters are very often the vitreous ageing. In a child that explanation is less likely, so the back of the eye deserves a proper look.
That look is not a drama. I check the back of the eye, usually through a widened pupil, to be sure the retina is flat and there is no inflammation. If it is healthy, I can tell you what the specks are and what to watch for. The action: a child who reports floaters for the first time should have one eye check soon, and the signs below should not wait.
Which signs mean my child needs an eye doctor today?
Go the same day if any of these is true. The first three are the Academy's emergency list for a retinal tear or detachment, when the retina lifts away from the back of the eye.
- A shower of new floaters at once, or a sudden increase in the number. The NHS says to get help if floaters "suddenly appear in your vision or suddenly increase in number".
- Flashes of light, especially together with new floaters.
- A shadow at the side of the vision, or what the Academy calls "a gray curtain" covering part of what your child sees.
- Any new spot after a knock to the eye. The Academy's advice for children: "If a spot appears after an injury to the eye, visit the ophthalmologist right away." The first steps after a knock are in child poked in the eye: a blunt injury.
- Spots with eye pain, redness, or light that hurts.
- Any of the above in a child who is already very short-sighted. The Academy and the NHS both list being nearsighted as a risk for the retina to tear or detach.
A detached retina needs surgery, and the Academy warns that untreated it risks permanent vision loss. That is the reason for "today". It is not a reason to panic, only to move. The action: do not wait to see whether it settles overnight, and do not let your child rub, run or rough-play while you travel.
Why does a very short-sighted child need extra care?
A strongly short-sighted eye is longer than usual. That is why both the Academy and the NHS name short-sightedness as a risk for retinal detachment. It does not mean your child will have one. It means the red flags above matter more, and a family that already has a high prescription should know them by heart.
If your child's number is climbing, high myopia: what changes once the number gets high goes through the eye-health checks that come with it. The action: tell any new doctor or optician about the prescription, and keep the follow-up visits you were given.
What if the eye is also sore or red?
Then it is not just a speck. The Academy teaches parents a short rule, RSVP: redness, sensitivity to light, vision change or pain, and it advises prompt care when two or more of them come together. A floater plus any one of these is a reason to go today, because inflammation inside the eye can cause floaters and needs treatment.
Pain on its own has its own page: my child says their eye hurts, and when to go today. The action: note whether the light bothers your child and whether the eye looks red, and tell the doctor.
What if it is a zigzag line that shimmers, not a spot?
That is a different story. A shimmering zigzag that spreads and clears completely, seen with both eyes, is the pattern of a migraine aura, and it is covered in flashing lights and zigzag lines: when it is migraine. This page is about the other group: dark specks and threads, and flashes that come with them or with a shadow.
If you cannot tell which your child has, treat it as the second group until a doctor says otherwise. Flashes in one eye, or flashes with new floaters or a shadow, need to be seen today. The action: ask whether it was in one eye or both, how long it lasted and whether it came with a headache.
What should I do tonight, and what happens next?
If a red flag applies, go to an eye doctor or a hospital with an eye service today, and take your child's glasses. If none applies and your child is comfortable, book an eye check in the next few days. Note when the spots began, whether it is one eye or both, whether there were flashes, and whether anything hit the eye. The is-this-urgent guide lists the other symptoms that should not wait.
At the visit I look at the back of the eye and test the vision. If the retina is healthy, the usual plan is to leave the specks alone and to come back at once if they change. If there is a tear or inflammation, we treat it. The action: you know your child best, so if something feels wrong, go. A child who turns out to be fine has cost you an afternoon, which is a fair price for being sure.
- A sudden shower of new floaters, or a sudden rise in the number.
- Flashes of light, especially with new floaters.
- A shadow at the side of the vision, or a grey curtain over part of it.
- A knock or blow to the eye, even a minor one.
- Eye pain, redness or light that hurts, or a child who is already very short-sighted.
Common questions
What are floaters in a child's eye?
Why does my child only see the spots against the sky or a white screen?
My child says there is a bug or a hair in their eye, but I see nothing. What is it?
Are floaters dangerous in children?
When should I take my child to an eye doctor the same day?
Can a knock to the eye cause floaters?
Does being short-sighted make this more serious?
Is a flashing zigzag line the same as a floater?
- American Academy of Ophthalmology · What are floaters and flashes? · www.aao.org
- American Academy of Ophthalmology · What is a detached retina? · www.aao.org
- American Academy of Ophthalmology · Common eye problems in children: symptoms every parent should know · www.aao.org
- NHS · Retinal detachment · www.nhs.uk
- NHS · Eye injuries · www.nhs.uk