A photopsia is an optical hallucination in which colors, flashes of light or sparks are perceived without a corresponding environmental stimulus. These phenomena typically occur suddenly and regress after a short period[^1]

Etiology

Photopsias can occur unilaterally or bilaterally and have a variety of different causes[^1]. For example, photopsias can occur as part of an "aura" in connection with migraines or epileptic seizures involving the occipital- or temporal lobe. In addition, they occur in neuritis of the optic nerve, organic psychoses, or traumas (contusion of the eye, head injury) occur.