I work for an optometrist and can tell you we don't take flashing in the eyes lightly. There can be many different reasons for this from very innocent cases and blood pressure to a condition at the back of the eye near the retina being de tatched. Has it been there long or just started up recently?
I am sure the photos they took were to examine the retina and that is why they are going to review prev images. They would of been able to see a partial detachment and would of acted on it quickly, this can often be re-attached if caught early, and especially being on the weekend they would not of let you go home.
Try not to worry but if it becomes more intense or if it worries you go to your emergency department and see the opthalmologist on call.
Hoping that it is something less sinister which I am thinking that it may be.
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