Flashing lights in vision often appear as brief flickers, arcs, or lightning-like streaks. They can be harmless but sometimes signal serious eye problems.
Common causes of flashing lights
Flashes often occur when the vitreous gel inside the eye tugs on the retina. This is more common with age or in people who are short-sighted.
- Posterior vitreous detachment can cause intermittent brief flashes
- Migraine aura may produce shimmering zigzags or patterns in both eyes
- Head injury or sudden eye movement can trigger momentary flashes
- Flashes without pain may still need prompt assessment
When flashing lights are urgent
Flashes with a sudden shower of floaters or a dark curtain may indicate a retinal tear. Quick treatment helps prevent retinal detachment and permanent vision loss.
- Seek emergency eye care for new, persistent flashes, especially in one eye
- Describe any associated floaters or shadows in detail
- Do not drive yourself if vision feels unsafe
- Regular monitoring is important if a cause has already been found
