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Closed-eye hallucinations and closed-eye visualizations (CEV) are hallucinations that occur when one's eyes are closed or when one is in a darkened room. They should not be confused with phosphenes , perceived light and shapes when pressure is applied to the eye's retina, or some other non-visual external cause stimulates the eye.
Other phenomena of binocular vision include utrocular discrimination (the ability to tell which of two eyes has been stimulated by light), [6] eye dominance (the habit of using one eye when aiming something, even if both eyes are open), [7] allelotropia (the averaging of the visual direction of objects viewed by each eye when both eyes are open ...
To close and open, or "wink", both eyes is usually an involuntary action known as a "blink". Though if done intentionally, in a particular way (such as once slowly or a few times in a row quickly), while giving a sweet or suggestive look with the eyes, often with the head tilted or at an angle in combination with the shoulders, is known as to ...
The visual effect is described as the loss of vision as the brain cuts off the unchanging signal from the eyes. The result is "seeing black", [ citation needed ] an apparent sense of blindness. A flickering ganzfeld causes geometrical patterns and colors to appear, and this is the working principle for mind machines and the dream machine .
Having two eyes allows the brain to determine the depth and distance of an object, called stereovision, and gives the sense of three-dimensionality to the vision. Both eyes must point accurately enough that the object of regard falls on corresponding points of the two retinas to stimulate stereovision; otherwise, double vision might occur.
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Blinking is a bodily function; it is a semi-autonomic rapid closing of the eyelid. [1] A single blink is determined by the forceful closing of the eyelid or inactivation of the levator palpebrae superioris and the activation of the palpebral portion of the orbicularis oculi, not the full open and close.
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