03-09-2011, 09:22 AM
(03-09-2011, 12:41 AM)zenmaster Wrote: What may confound the examination further is people confusing them with purely internal effects (phosphenes) or optic nerve stimulation due to health problems.
that's quite easy to distinguish - such physical/physiological effects do not consciously interact with you. your thought or intent, does not get a reflection that is intelligible.