Answer
When are flashes of light an emergency?
Medical reviewer Mr Mohamed Mohyudin· Last recorded site review
About this review
This page inherits the site’s previous review record. A separate, current article sign-off has not yet been recorded.
Treat these as an emergency
- New or repeated flashes in one eye, especially with new floaters
- A sudden shower of spots
- A dark curtain or shadow spreading
- Sudden vision loss
Who should skip this page?
If the red-flag list matches, go to emergency eye care rather than finishing the article. If you also have a sudden headache with weakness, speech change or a drooping face, call emergency services — that can be a stroke pattern, not only an eye-gel tug.
How retinal flashes differ from migraine
Retinal flashes are often brief streaks or flickers in one eye, worse in the dark, and may come with floaters. Migraine visual aura is usually a binocular zigzag or scintillating scotoma that builds over minutes and then fades. The overlap can confuse people. New one-eye flashes still need a dilated retina check; do not self-diagnose migraine from this page.
Ocular migraine and retinal migraine are specialist labels. They do not cancel the rule that a curtain or a floater shower is an emergency.
What the examination is for
The point is to find a retinal tear while it can still be sealed. Most new-flash patients have PVD without a tear. You cannot tell which group you are in from a description. Dilating drops and a look at the far periphery are the test; an undilated glance is not.
Frequently asked questions
I have had flashes for years. Is that an emergency?
Stable, occasional flashes that have not changed for a long time are often related to an old PVD. A new change in frequency, new floaters, or a shadow still needs same-day care.
Can stress cause flashes?
Stress does not make a retinal tear safe to ignore. New one-eye flashes still need examination.
Should I wait until morning?
Not if flashes are new and come with a floater shower or a curtain. Those cannot wait for a routine slot.
Do both eyes flashing mean it is migraine?
Binocular zigzag that builds and fades over minutes often is migraine aura — still get checked if you are unsure, if it is a first episode, or if there are stroke symptoms.
Sources for this information
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