About this article
Medically reviewed- Written by
- Dr Paul Watson
- Medically reviewed by
- Dr Han Simpson
- Published
- April 20, 2026
- Medical review date
- September 8, 2026
- Evidence searched through
- September 8, 2026
- Next review due
- September 8, 2027
- Intended audience
- General Readers & Patients
- Geographic scope
- Worldwide
- Conflicts of interest
- None declared.
- Funding
- Website Owner
- Report a correction
- Report an error or editorial concern
- Medical disclaimer
- Read the medical disclaimer
Seeing flashes of light in the corner of your eye can be unsettling, especially if it happens suddenly or repeatedly. One of the most common questions patients ask is: why am I seeing flashes of light in the corner of my eye?
In clinical practice, this symptom is often linked to changes in the eye’s internal structures—but in some cases, it can signal a more serious issue that requires urgent attention.
In this guide, I’ll explain the most common causes, what these flashes mean, when to worry, and what you should do next.
What Are Flashes of Light in Your Vision?
Flashes of light, medically known as photopsia, are brief bursts or streaks of light that appear without an external light source.
Patients often describe them as:
- Lightning streaks
- Camera flashes
- Sparkles or flickers
- Arcs of light in peripheral vision
They are most noticeable in low-light conditions or when moving your eyes.
Why Am I Seeing Flashes of Light in the Corner of My Eye?
Direct Answer
Flashes of light are usually caused by the vitreous (gel inside the eye) pulling or tugging on the retina, stimulating it and creating the sensation of light.
This is often harmless—but not always.
The Most Common Causes
1. Posterior Vitreous Detachment (PVD)
This is the most common cause, especially as people age.
What Happens:
- The vitreous gel inside the eye shrinks
- It pulls away from the retina
- This traction stimulates the retina, causing flashes
Who Is at Risk:
- People over 40
- Those who are nearsighted
- Individuals after eye surgery
👉 In most cases, this is benign, but it must be evaluated to rule out complications.
2. Retinal Tear or Detachment (Medical Emergency)
This is the most serious cause.
What Happens:
- The retina develops a tear
- Fluid can get underneath it
- The retina begins to detach
Warning Signs:
- Sudden increase in flashes
- New floaters (black spots or cobwebs)
- A shadow or “curtain” over vision
- Partial vision loss
👉 This requires immediate medical attention.
3. Migraine With Aura
Some patients experience visual disturbances before a migraine.
Symptoms Include:
- Zigzag lines
- Flashing lights
- Blind spots
These typically:
- Affect both eyes
- Last 20–30 minutes
- May occur without headache
4. Eye Trauma
A direct hit or injury to the eye can:
- Disturb the vitreous
- Trigger retinal stimulation
- Cause temporary flashes
5. Inflammation Inside the Eye (Uveitis)
Inflammation can irritate internal eye structures and lead to:
- Light flashes
- Eye pain
- Redness
- Blurred vision
6. Pressure on the Eye
Even simple pressure—such as rubbing your eyes—can stimulate the retina and cause brief flashes.
These are usually harmless and short-lived.
Are Flashes in the Corner of the Eye More Concerning?
Flashes in peripheral (corner) vision are particularly associated with:
- Vitreous pulling on the retina
- Retinal tears
👉 This is why flashes in the corner of your eye should never be ignored.
When Should You Worry?
Seek Urgent Medical Attention If You Notice:
- Sudden onset of flashes
- Increase in frequency or intensity
- New floaters appearing
- A dark shadow or curtain in vision
- Blurred or reduced vision
These symptoms may indicate a retinal tear or detachment, which can lead to permanent vision loss if untreated.
Quick Answer Section
Why am I seeing flashes of light in the corner of my eye?
Flashes are usually caused by the vitreous pulling on the retina, but they can also signal serious conditions like retinal detachment.
Are Flashes Always Serious?
Not always.
In many cases—especially with age-related vitreous changes—they are benign.
However, because serious conditions can present similarly, it’s important to get them checked.
How Are Flashes Diagnosed?
An eye specialist (optometrist or ophthalmologist) will perform:
- A dilated eye exam
- Retinal examination
- Possibly imaging tests
This helps rule out retinal tears or detachment.
Treatment Options
Treatment depends entirely on the cause.
For Posterior Vitreous Detachment
- Usually no treatment required
- Symptoms may fade over weeks or months
- Monitoring is essential
For Retinal Tears
- Laser treatment
- Cryotherapy (freezing treatment)
These help prevent detachment.
For Retinal Detachment
- Surgical repair
- Urgent intervention required
For Migraines
- Migraine management strategies
- Lifestyle adjustments
- Medication if needed
Can Flashes Go Away on Their Own?
Yes, in many cases.
With vitreous detachment:
- Flashes often decrease over time
- The brain adapts to the changes
However, new or worsening symptoms should always be evaluated.
Who Is Most at Risk?
You may be more likely to experience flashes if you:
- Are over 40
- Are highly nearsighted
- Have had eye surgery
- Have a history of eye trauma
- Have diabetes
How to Protect Your Eye Health
While not all causes are preventable, you can reduce risk by:
- Getting regular eye exams
- Managing chronic conditions (like diabetes)
- Protecting your eyes from injury
- Avoiding excessive eye rubbing
Common Questions
Are flashes of light normal?
They can be normal with aging, but sudden or new flashes should always be checked.
Can stress cause flashes?
Stress itself doesn’t directly cause flashes, but it can trigger migraines, which may include visual symptoms.
Are flashes worse at night?
Yes, they are often more noticeable in dark environments.
Final Thoughts From a Doctor
If you’re asking “why am I seeing flashes of light in the corner of my eye?”, the most important thing to understand is this:
👉 While many causes are harmless, some can threaten your vision and require urgent care.
From a clinical standpoint:
- New flashes should always be evaluated
- Sudden changes are more concerning
- Early treatment can prevent serious complications
Key Takeaway
👉 Flashes of light in the corner of your eye are often caused by changes in the vitreous, but they can also signal retinal problems that need urgent attention.