Silver Tunnel Vision
Tunnel vision can be caused by:
Glaucoma, a disease of the eye.
Retinitis pigmentosa, a disease of the eye.
Blood loss (hypovolemia)
Alcohol consumption. In addition, the vision becomes blurred or double since eye muscles lose their precision causing them to be unable to focus on the same object.
Sustained (1 second or more) high accelerations.[ Typically, flying an airplane with a centripetal acceleration of up to or over 39 m/s2 (4gs) with the head towards the center of curvature, common in aerobatic or fighter pilots. In these cases, tunnel vision and greyout may proceed to a g-force induced Loss Of Consciousness (g-LOC).
Hallucinogenic drugs, in particular the dissociatives.
Extreme fear or distress, most often in the context of a panic attack.
Excitement or extreme pleasure such as on a roller-coaster, causing a surge of adrenaline in the body.
During periods of high adrenaline production, such as an intense physical fight.
Altitude sickness, hypoxia in passenger aircraft.
Exposure to oxygen at a partial pressure above 1.5-2 atmospheres, producing central nervous system oxygen toxicity, called narcosis. Other symptoms can include dizziness, nausea, blindness, fatigue, anxiety, confusion and lack of coordination.
Pituitary tumours (or other brain tumours that compress the optic chiasm)
Prolonged exposure to air contaminated with heated hydraulic fluids and oils, as can sometimes happen in passenger aircraft.
Severe cataracts, causing a removal of most of the field of vision
During the aura phase of a migraine
Intense anger, due to the body being rapidly flooded with adrenaline and oxygen
A bite from a black mamba and other snakes with the same strength venom.
Mercury poisoning (especially methylmercury)
Sleep deprivation..
Or being as drunk as a skunk, of course.
Silver Tunnel Vision
Tunnel vision can be caused by:
Glaucoma, a disease of the eye.
Retinitis pigmentosa, a disease of the eye.
Blood loss (hypovolemia)
Alcohol consumption. In addition, the vision becomes blurred or double since eye muscles lose their precision causing them to be unable to focus on the same object.
Sustained (1 second or more) high accelerations.[ Typically, flying an airplane with a centripetal acceleration of up to or over 39 m/s2 (4gs) with the head towards the center of curvature, common in aerobatic or fighter pilots. In these cases, tunnel vision and greyout may proceed to a g-force induced Loss Of Consciousness (g-LOC).
Hallucinogenic drugs, in particular the dissociatives.
Extreme fear or distress, most often in the context of a panic attack.
Excitement or extreme pleasure such as on a roller-coaster, causing a surge of adrenaline in the body.
During periods of high adrenaline production, such as an intense physical fight.
Altitude sickness, hypoxia in passenger aircraft.
Exposure to oxygen at a partial pressure above 1.5-2 atmospheres, producing central nervous system oxygen toxicity, called narcosis. Other symptoms can include dizziness, nausea, blindness, fatigue, anxiety, confusion and lack of coordination.
Pituitary tumours (or other brain tumours that compress the optic chiasm)
Prolonged exposure to air contaminated with heated hydraulic fluids and oils, as can sometimes happen in passenger aircraft.
Severe cataracts, causing a removal of most of the field of vision
During the aura phase of a migraine
Intense anger, due to the body being rapidly flooded with adrenaline and oxygen
A bite from a black mamba and other snakes with the same strength venom.
Mercury poisoning (especially methylmercury)
Sleep deprivation..
Or being as drunk as a skunk, of course.