Persistent visual phenomenon: This is a common condition where patients experience persistent visual disturbances, including afterimages, after exposure to bright lights or retinography. The normal fundus and OCT results support this diagnosis, as it is often related to the brain's processing of visual information rather than a structural issue with the eye.

Digital eye strain: Prolonged exposure to digital devices, including the equipment used for retinography, can cause eye strain, leading to afterimages and other visual disturbances.
Phototoxicity: Although less common, phototoxicity from the retinography procedure itself could potentially cause afterimages, especially if the eye was exposed to high-intensity light without proper protection.

Retinal detachment: Although the fundus and OCT are reported as normal, any new or persistent visual disturbance warrants a thorough examination to rule out retinal detachment, which is a medical emergency.
Central serous chorioretinopathy (CSC): This condition can cause visual disturbances, including afterimages, and while the OCT is reported as normal, CSC can sometimes present with subtle findings that may not always be immediately apparent.

Hallucinatory palinopsia: A rare condition characterized by the persistence or recurrence of visual images after the original stimulus has been removed, which could be considered in the context of persistent afterimages without a clear structural cause.
Epileptic phenomena: In rare cases, certain types of epilepsy can cause visual disturbances, including afterimages, although this would typically be accompanied by other neurological symptoms.