 Maybe something else...
This isn't as spiritually uplifting as the other replies, but it's possible you could be having ocular migraines. In December I started getting these strange shimmering light visuals, a couple times at work, and then once at home. It was never accompanied by pain, but I was concerned so I asked my doctor. He said it could be ocular migraines. He suggested I visit an eye doctor to confirm, but so far I haven't.
However, now that I think about it, I like the idea of a spiritual presence much better!
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