<P> CEV does not involve the liquid and air bubbles on the surface of the cornea, which can also be seen by extremely nearsighted people when looking at bright point - light sources with glasses / contacts removed . Also called "floater" - often appear as cells floating across the eye . Full - closing and reopening the eyelids creates a very definite wiper - ridge in the corneal liquid that is readily visible . Fully closing and reopening the eyelids also stirs up the corneal liquid which settles down after a brief moment . The motion of waking - consciousness CEV noise is not so directly and physically controllable and repeatable . This is not necessarily only associated with extreme nearsightedness . </P> <P> CEV does not seem to be related to the "sprites" (blue field entoptic phenomenon) that can be seen as dots darting around when staring up into a bright blue sky on a sunny day (not looking at the sun). These dots superimposed over a flat blue background are white blood cells moving through the blood vessels of the retina . The motion of waking - consciousness CEV noise is uniformly random compared to the waking - consciousness blue - sky sprite motion . </P> <P> CEV is unrelated to the visual noise seen when the retina is physically stimulated . The retina can be made to produce light patterns of visual noise simply by one rubbing their eyes somewhat forcefully in a manner that increases intraocular pressure . Additionally, retinal noise can be produced by touching near the rear of the eyeball producing pressure phosphenes (for example, if one closes one's eyes, looks all the way left, and lightly touches the rightmost part of the eye socket, this produces visual noise in the shape of a circle that appears at the left side of the visual field - a practice that is neither painful nor dangerous). None of these are closed - eye hallucinations . </P>

Why do i hallucinate when i close my eyes