expression, ichidan verb
see stars (after a blow to the head)
Idiomatic expression describing the sensation of flashes of light or 'seeing stars' after a strong impact to the head.
転んで頭を打って、目から火が出た。
I fell and hit my head, and I saw stars.
The exact origin is uncertain, but the expression is a vivid metaphor for the sensation of flashing lights after a head injury.