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I absolutely agree it could be energy of any sort that caused the strange coloring of everything you saw. Blood sugar drop is also a possibility, good idea. I've never had a floater big enough to make the carpet green, and retinal damage is usually a longer lasting situation (not caused or happening only when you're meditating). If that is a possibility (however unlikely it is) given your special situations regarding medical history, Hunter, make sure you check in with an eye doctor.