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It is likely that you are experiencing the flashes symptoms of posterior vitreous
detachment (PVD) which tends to occur due aging vitreous (thick clear gel) inside the eye. However, if you do have headaches and/or migraine
then the neurologist would need to perform tests including CT scan and/or MRI to exclude any abnormal brain lesion.
In general, the aging vitreous tends to collapse and/or form pockets of liquefied vitreous, which causes the edge of the vitreous to become loosely attached or detached from the back of the eye (retina). These pockets of melted vitreous and/or loosely attached/PVD stimulates the retina especially with movement to cause flashing sensations. This is often not harmful. It is not retinal detachment
, and there is no damage to the retina. The management of PVD is with routine complete dilated eye examination by the retinal eye doctor to exclude any occurrence or associated retinal tear or hole due the the traction of the PVD on the retina from which there could be a future site of retinal detachment. If the symptoms of flashes become severe to obstruct your vision, the retina eye surgery
can surgically remove the melted vitreous to resolve the symptoms, but this is uncommon.
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Please note that this answer is for information only. It cannot be substituted for the visit to or the recommendation of your doctor.