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Tunnel vision can be caused by:
- Alcohol consumption causes tunnel vision . 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.
- Group B Rally driving (1985, 1986) 
- 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 brownout may proceed to or g-force induced Loss Of Consciousness (g-LOC).
- Hallucinogenic drugs.
- Glaucoma, a disease of the eye.
- Extreme fear or distress, most often in the context of a panic attack.
- During 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, notably while diving.  Other symptoms can include dizziness, nausea, blindness, fatigue, anxiety, confusion and lack of coordination.
- Other loss of blood to the brain.
- Prolonged exposure to air contaminated with heated hydraulic fluids and oils, as can sometimes happen in passenger aircraft .
- Pituitary stalk mass (i.e. tumor) compressing the optic chiasm
- 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
- High doses of dextromethorphan 
When combined with piloting an aircraft, driving, crossing roads or operating heavy machinery, the consequences have been known to be fatal[How to reference and link to summary or text].
- ↑ Effects of Alcohol on Vision
- ↑ a b c d Cullen, John. Petrolheads: Too fast to stay. Sligo Weekender. Retrieved on 2006-11-17.
- ↑ Erowid DXM Vault: Effects
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