Pituitary tumours (or other brain tumours that compress the optic chiasm).Other symptoms can include dizziness, nausea, blindness, fatigue, anxiety, confusion and lack of coordination. Exposure to oxygen at a partial pressure above 1.5-2 atmospheres, producing central nervous system oxygen toxicity, called narcosis.Altitude sickness, hypoxia in passenger aircraft.During periods of high adrenaline production, such as an intense physical fight. Excitement or extreme pleasure such as on a roller-coaster, causing a surge of adrenaline in the body.Extreme fear or distress, most often in the context of a panic attack.Stimulant drugs that release and/or prevent the reuptake of dopamine and norepinephrine, in particular amphetamines.Hallucinogenic drugs, in particular dissociatives.In these cases, tunnel vision and greyout may proceed to a g-force induced Loss Of Consciousness ( g-LOC). Typically, flying an airplane with a centripetal acceleration of up to or over 39 m/s 2 (about 4 g) with the head towards the center of curvature, common in aerobatic or fighter pilots. Sustained (1 second or more) high accelerations.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. Retinitis pigmentosa, a disease of the eye.
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