Floaters and Flashes: When to Worry

Seeing spots, strings, cobwebs, sparkles, or flashes of light can be unsettling.

Sometimes floaters are harmless. Sometimes they are part of normal aging changes inside the eye. Sometimes they happen after the gel inside the eye shifts or pulls away from the retina.

But sometimes floaters and flashes are warning signs of something more serious, such as a retinal tear or retinal detachment.

That is why the timing matters.

• A few floaters that have been there for years may not be urgent.
• New floaters, a sudden increase in floaters, flashes of light, a curtain or shadow in your vision, or sudden vision loss should be checked right away.

The goal is not to panic. The goal is to know when to call.

What Are Floaters?

Floaters are small shapes that seem to drift through your vision.

People describe them as:

• Spots
• Dots
• Strings
• Cobwebs
• Threads
• Squiggles
• Bugs
• Shadows
• Rings
• Small dark shapes

They may move when your eye moves. They may seem to drift away when you try to look directly at them.

Floaters are often easier to see against a bright background, like a white wall, blue sky, computer screen, or bright paper.

They are usually caused by changes in the vitreous, which is the clear gel-like substance inside the eye. As the vitreous changes, small clumps or strands can cast shadows on the retina. Your brain sees those shadows as floaters.

What Are Flashes?

Flashes are brief bursts or streaks of light that you see when there is no actual light causing them.

People may describe flashes as:

• Lightning streaks
• Sparkles
• Camera flashes
• Flickers
• Arcs of light
• Flashing in the side vision
• Light that appears when moving the eyes

Flashes can happen when the vitreous pulls on the retina.

The retina is the light-sensitive tissue in the back of the eye. If something tugs on it, you may see flashes.

Flashes can also happen with migraine aura or other causes, but new flashes should still be taken seriously, especially if they happen with new floaters, a shadow, or vision changes.

Why Floaters and Flashes Matter

The concern is the retina.

The retina lines the back of the eye and is essential for vision. If the retina tears or detaches, it needs urgent care.

• A retinal tear can sometimes be treated before it becomes a retinal detachment.
• A retinal detachment is more serious because the retina pulls away from the back of the eye. If not treated quickly, it can lead to permanent vision loss.

Floaters and flashes do not always mean you have a retinal tear or detachment.

But they are important warning signs.

That is why new symptoms should not be ignored.

When to Call the Eye Doctor Right Away

Call the eye doctor right away if you notice:

• New floaters
• A sudden increase in floaters
• Flashes of light
• Floaters and flashes together
• A curtain or shadow in your vision
• A dark area in your side vision
• Vision loss
• Blurry vision that starts suddenly
• Floaters after an eye injury
• Flashes after an eye injury
• New symptoms after eye surgery
• New floaters if you are very nearsighted
• New symptoms if you have diabetes or retinal disease

These symptoms may need a same-day dilated eye exam.

If you cannot reach an eye doctor and you have a curtain, shadow, sudden vision loss, or rapidly worsening symptoms, seek emergency care.

What Does a Curtain or Shadow Mean?

A curtain or shadow in your vision is one of the most concerning symptoms.

Patients may describe it as:

• A gray curtain
• A dark veil
• A shadow coming from the side
• Missing side vision
• A dark area that does not move
• A blurry blocked area
• A shade being pulled over part of the eye

This can be a sign of retinal detachment.

Do not wait to see if it goes away.

Call the eye doctor immediately or seek emergency care.

Are Floaters Always Dangerous?

No.

Many floaters are not dangerous.

Some people have floaters for years. Some notice them more in bright light. Some notice them more after they are tired or using screens. Some floaters become less noticeable over time because the brain adapts.

But you cannot tell at home whether a new floater is harmless.

A new floater could be from a normal vitreous change, or it could be from bleeding, inflammation, a retinal tear, or another eye problem.

That is why new floaters need an exam.

Once the retina has been checked and the doctor confirms there is no tear or detachment, many floaters can simply be monitored.

What Is Vitreous Detachment?

Vitreous detachment happens when the gel inside the eye separates from the retina.

This is common as people age.

As the vitreous pulls away, it can cause new floaters or flashes. In many cases, this does not lead to a serious problem.

But in some cases, the vitreous pulls hard enough to create a retinal tear.

That is why symptoms of vitreous detachment should be checked with a dilated eye exam.

• You cannot feel a retinal tear.
• You may only notice floaters, flashes, or a change in vision.

What Is a Retinal Tear?

A retinal tear is a break in the retina.

It may happen when the vitreous pulls on the retina.

A retinal tear can sometimes lead to retinal detachment if fluid passes through the tear and lifts the retina away from the back of the eye.

If a retinal tear is found early, treatment may be recommended to seal the tear and reduce the risk of detachment.

This is one reason early evaluation matters.

What Is Retinal Detachment?

Retinal detachment happens when the retina pulls away from the back wall of the eye.

This is a medical urgency.

Symptoms may include:

• New floaters
• Flashes of light
• A curtain or shadow
• Loss of side vision
• Blurry vision
• Sudden decrease in vision

Retinal detachment usually needs urgent treatment.

The sooner it is found, the better the chance of protecting vision.

Who Is at Higher Risk?

Floaters and flashes can happen to anyone, but some people have a higher risk of retinal tears or detachment.

Risk factors may include:

• High myopia
• Previous retinal tear or detachment
• Family history of retinal detachment
• Eye trauma
• Recent eye surgery
• Cataract surgery
• Diabetes related eye disease
• Inflammation inside the eye
• Certain retinal conditions
• Increasing age

If you are very nearsighted, new floaters or flashes should be taken seriously.

If you have had a retinal tear or detachment in one eye, new symptoms in either eye should be evaluated promptly.

Can Children Have Floaters and Flashes?

Children can have floaters and flashes, but they may not describe them clearly.

A child may say:

“I see bugs.”

“I see spots.”

“I see sparkles.”

“I see lights.”

“Something is floating.”

“Part of my vision is dark.”

“I cannot see out of the side.”

“My eye feels weird.”

In children, new floaters or flashes should be checked, especially after an eye injury, head injury, or sports impact, or if the child has a known eye condition.

Children may also describe visual symptoms during migraine, but it is still important not to assume.

If the symptom is new, repeated, one-sided, or associated with vision loss, eye pain, injury, or neurologic symptoms, call for care.

Can Migraines Cause Flashes?

Yes. Migraine aura can cause flashing lights, zigzags, shimmering, blind spots, or visual patterns.

Migraine-related visual symptoms often affect both eyes together, may spread or change over several minutes, and may be followed by headache or other migraine symptoms.

Retinal flashes are different. They are often brief, may happen in one eye, and may be associated with new floaters or side vision changes.

It can be hard to tell the difference at home.

If you have new flashes, especially with floaters, a curtain, shadow, or vision loss, call the eye doctor.

If you have new neurologic symptoms such as weakness, facial drooping, confusion, trouble speaking, or severe sudden headache, seek emergency medical care.

Can Dry Eye Cause Floaters?

No.

Dry eye can cause burning, stinging, watering, fluctuating blur, redness, and irritation.

Dry eye does not cause true floaters inside the vision.

Sometimes people use the word floaters to describe blurry spots on the surface of the eye, mucus, or vision that clears after blinking. That is different from true floaters inside the eye.

If you see spots, strings, cobwebs, or shadows drifting through your vision, especially if they are new, you need an eye exam.

Can Screens Cause Floaters?

Screens do not usually cause true floaters.

Screens may make existing floaters more noticeable because they create a bright background. You may notice floaters more when looking at a white screen, bright page, or blue sky.

Screen use can cause eye strain and dry eye symptoms, but it does not explain new flashes or a sudden increase in floaters.

Do not blame new floaters or flashes on screens without getting checked.

Can Stress Cause Flashes?

Stress can contribute to migraines, headaches, and visual discomfort for some people.

But stress should not be assumed to be the cause of new flashes.

Flashes can be related to vitreous traction on the retina. Because retinal tears and detachment need urgent care, new flashes should be checked.

It is safer to rule out a retinal problem first.

What If Floaters Are in One Eye?

One-eye symptoms matter.

Floaters or flashes in one eye can happen with vitreous detachment, retinal tear, retinal detachment, bleeding, inflammation, trauma, or other eye conditions.

If you are not sure whether it is one eye or both, cover one eye at a time and notice where the symptom appears.

But do not spend days trying to figure it out.

New symptoms should be evaluated.

What If Floaters Are in Both Eyes?

Floaters can be present in both eyes, especially with aging or high myopia.

But a sudden change still matters.

If you suddenly notice new floaters in one eye or both eyes, call the eye doctor.

If the symptoms include flashes, shadow, curtain, or vision loss, call immediately.

What If I Have Had Floaters for Years?

Longstanding floaters that have not changed are often less concerning than sudden new floaters.

But you should still mention them during routine eye exams.

Call sooner if they change.

Important changes include:

• More floaters than usual
• A new large floater
• New flashes
• A dark shadow
• A curtain
• Blurry vision
• Vision loss
• Floaters after injury

A stable floater is different from a new symptom.

What Happens During the Exam?

If you call with new floaters or flashes, the doctor will usually want to dilate your eyes.

Dilation makes the pupils larger so the doctor can look carefully at the retina.

The exam may include:

• Checking vision
• Asking when symptoms started
• Asking if symptoms are in one eye or both
• Checking eye pressure when needed
• Looking at the front of the eye
• Dilating the pupils
• Examining the retina
• Looking for retinal tears, holes, bleeding, inflammation, or detachment
• Using imaging when appropriate
• Referring to a retina specialist if needed

Your vision may be blurry and light sensitive after dilation, so bring sunglasses and avoid driving if you do not feel safe.

Why Dilation Matters

A routine vision check is not enough for new floaters and flashes.

The concern is in the back of the eye.

The retina needs to be examined.

Dilation gives the doctor a better view of the retina, especially the outer areas where retinal tears can occur.

If a tear is missed and becomes a detachment, the risk to vision becomes much greater.

That is why new symptoms should not be brushed off.

What If the Exam Is Normal?

That is good news.

If the retina is healthy and there is no tear or detachment, the doctor may tell you to monitor symptoms.

Floaters may become less noticeable over time.

Flashes may settle as the vitreous stops tugging.

But you still need to know the warning signs.

Call again if you notice:

• More floaters
• New flashes
• A curtain or shadow
• Vision loss
• Worsening blur
• Any new symptom that concerns you

Sometimes a follow-up exam is recommended because symptoms can change as the vitreous continues to separate.

How Are Retinal Tears Treated?

If a retinal tear is found, the eye doctor may refer you to a retina specialist.

Treatment may include laser treatment or freezing treatment to seal the tear and reduce the risk of retinal detachment.

The exact treatment depends on the tear, location, symptoms, and retina specialist’s findings.

The important point is that retinal tears are often more manageable when caught before detachment occurs.

How Is Retinal Detachment Treated?

Retinal detachment usually requires urgent treatment by a retina specialist.

Treatment may involve surgery or other procedures depending on the type and severity of detachment.

This is not something to watch at home.

If you have symptoms of retinal detachment, you need urgent evaluation.

Can Floaters Be Removed?

Most floaters do not need treatment.

Many become less noticeable with time.

In rare cases, severe floaters that significantly interfere with vision may be treated with procedures such as vitrectomy or laser treatment in selected cases.

These treatments have risks and are not used for every patient.

For most people, the first priority is making sure the floaters are not a sign of a retinal tear or detachment.

Once the retina is healthy, treatment decisions can be discussed if floaters remain very bothersome.

What Should You Not Do?

If you see new floaters or flashes, do not:

• Wait weeks to see if it goes away
• Assume it is from screens
• Assume it is dry eye
• Assume it is stress
• Ignore a curtain or shadow
• Ignore sudden vision loss
• Rub the eye after injury
• Keep playing sports after an eye injury without being checked
• Drive if your vision is suddenly impaired
• Skip dilation when the doctor recommends it

The biggest mistake is waiting when symptoms are sudden or changing.

When Should Adults Schedule Care?

Adults should call promptly for new floaters or flashes during a comprehensive eye exam, especially if symptoms are sudden.

This is especially important if you are over 40, very nearsighted, diabetic, had eye surgery, had trauma, or have a history of retinal problems.

Do not wait for your next routine exam if the symptoms are new.

A same-day or urgent medical eye visit may be needed.

When Should Parents Call for Children?

Call promptly to schedule a pediatric eye exam if your child reports new spots, flashes, sparkles, shadows, or missing vision.

Call right away if symptoms happen after:

• A ball hits the eye
• A fall
• A head injury
• A sports collision
• A finger poke
• A toy injury
• Any trauma near the eye

Children may not describe vision changes accurately, so it is safer to check.

Floaters, Flashes, and Urgent Eye Care at Pediatric & Family Vision

At Pediatric & Family Vision, we see children, teens, and adults for medical eye concerns, including new floaters, flashes, eye injuries, sudden vision changes, and other urgent symptoms.

If you call with new floaters or flashes, we will help determine how quickly you need to be seen. Many patients need a dilated eye exam to check the retina.

If we find something that needs retina specialist care, we will guide you to the right next step.

Floaters and flashes are not always dangerous, but they should be respected.

If you see a sudden increase in floaters, flashes of light, a curtain or shadow, or any sudden vision loss, do not wait.

Call the eye doctor right away.