I've seen them for a few years now, usually a few times during the day. Can't say I would associate them with meditation, though, as I don't practice that with any conscious intent. But I think they first came into presence after I began my spiritual journey in search of for healing. And hey, I just saw one flash right now as I write, heh.
They don't really appear much significant to me; more like a subtle thing in relation to whatever my system is going trough (clearing, possibly). But I'm curious, though. Will check out those links posted by Uma (thanks for sharing).
Oh, and I almost forgot: I usually see a very similar phenomenon when I look at something very bright, like snow in sunlight or the sunlit sky. Then I'll see a plethora of those sparks all over my vision field, although, they're all white.
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