Specialty Vision · Vision symptoms
Why do I see flashes of light?
Flashes are brief arcs, streaks or sparks of light, usually in the side vision, that aren't caused by anything around you.
What it looks like
Flashes often happen when the eye's gel tugs on the retina as it shrinks with age — and that tugging can occasionally tear the retina. Shimmering zig-zags that build up over 10-30 minutes are more typical of a migraine aura. Because new flashes can be an early warning of a retinal tear, they should be checked promptly, especially if they come with new floaters.
When to see an eye doctor
See an eye doctor promptly for new flashes of light — urgently if they come with a shower of new floaters or a shadow in your vision.
Seek urgent care for:
- New flashes of light
- Flashes with a sudden increase in floaters
- A dark curtain or shadow over part of your vision
Frequently asked questions
Are flashes of light dangerous?
They can be a warning sign. New flashes may mean the eye's gel is tugging on the retina and could tear it, so they should be checked promptly — urgently if new floaters appear too.
How is a migraine flash different?
A migraine aura usually builds over several minutes as a shimmering zig-zag or bright crescent, lasts under an hour, then clears. Retinal flashes are briefer arcs in the side vision.
Sources
- What Are Floaters and Flashes? — American Academy of Ophthalmology