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A greyout is a transient loss of vision characterized by a perceived dimming of light and color, sometimes accompanied by a loss of peripheral vision. [1] It is a precursor to fainting or a blackout and is caused by hypoxia (low brain oxygen level), often due to a loss of blood pressure .
Visual snow is a phenomenon where a person perceives visual disturbances, such as fine graininess or "static," in their field of vision. This can occur in low-light conditions, in the dark, or when the visual system amplifies light perception.
The condition primarily involves the retina, the light-sensitive tissue at the back of the eye, and occasionally the optic nerve, which carries visual information to the brain. When suffering from Cyanopsia some individuals may also experience blurred vision , or heightened sensitivity to bright light, which can make well-lit environments ...
One example of a pressure phosphene is demonstrated by gently pressing the side of one's eye and observing a colored ring of light on the opposite side, as detailed by Isaac Newton. [ 7 ] [ 8 ] [ 9 ] Another common phosphene is "seeing stars" from a sneeze , laughter, a heavy and deep cough, blowing of the nose , a blow on the head or low blood ...
Flash blindness occurs when an extremely bright flash is discharged, usually at night, and again vision is temporarily lost." [ 4 ] The United States Federal Aviation Administration defines flash blindness in Order JO 7400.2 as "generally, a temporary visual interference effect that persists after the source of the illumination has ceased."
Julian Lennon underwent surgery to treat skin cancer ... - AOL
Nyctalopia (/ ˌ n ɪ k t ə ˈ l oʊ p i ə /; from Ancient Greek νύκτ-(núkt-) 'night' ἀλαός (alaós) 'blind, invisible' and ὄψ (óps) 'eye'), [1] also called night-blindness, is a condition making it difficult or impossible to see in relatively low light. It is a symptom of several eye diseases.
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