what is the reason seeing sparks in one of your eye

Seeing sparks or flashes in one eye is often caused by photopsia , which can happen when the vitreous gel pulls on the retina, such as with a posterior vitreous detachment. It can also be linked to migraine aura, retinal tears or detachment, eye inflammation, or other eye problems.

When it matters

This is more urgent if the flashes are sudden, frequent, or come with new floaters, a dark curtain or shadow in vision, blurred vision, or recent eye injury, because those can signal a retinal tear or detachment.

What to do

You should get an eye exam soon, and seek urgent care the same day if the symptoms are new and severe or include vision loss. If the flashes are from a migraine, they may be temporary, but one-sided flashes still deserve medical evaluation to rule out eye causes first.

Quick note

If this is happening right now and it is new, treat it as an eye warning sign rather than something to watch casually.