The reason I ask is that my lady had a floater in her vision, then had a headache, went to the doc, they saw a hemmorage behind the eye, and said don't worry, make an appointment with the specialist, and call us if you see blinking lights.
the blinking started that night, and she went to the specialist.
Turns out, the blood was from a slight tear in the eye.
the floater and the flashing was an interesting thing.... when you get in the 40ish range... younger for my lady because she has thin retinas and other eye grief... the eyes change from a gelatinous filling to a liquid filling.... all in the mater of a couple months.
The floater was a portion of inner eye goo that had not liquified swimming in already liquified goo. the flashing was a result of the gelatinous mass moving as she moved her head, and it was attached to the retina, causing the flashes.
And here i was thinking I was making her see fireworks.