"Flashes" refer to when a person senses that there is present bright sparks of light present...yet there really are not. These occur because the vitreous pulls on the retina...and this pulling is sensed as a flash of light. When someone experiences flashes...they need to be examined by a retinal specialist...to ensure that the pulling by the vitreous did not cause a tear of the retina."Floaters" refer to when a patient sees floating images in their field of vision...much like the floating snowflakes in children's "snowglobes"...they are due to opacities within the vitreous cavity...they do not require further investigation or treatment...however rarely...if they are very central and persistent and bothersome...they can be removed with vitrectomy surgery.
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