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An abnormally persistent afterimage is a common symptom for individuals with eye diseases such as visual snow. Visual snow sufferers usually experience  symptoms such as: "persistent afterimages and trails following moving lights or images (palinopsia); photophobia; photopsia (temporary dark spots or bright flashes appearing in the field of vision); halos or starbursts around bright lights; grainy or 'snowy' vision (night vision seems especially affected); flickering or pulsating of vision (often aggravated at high altitude); bright blue or purple 'swirling' phenomena appearing in the field of vision when in the dark with eyes closed." The image below documents a familiar view for individuals who experience visual snow: 

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