This is done out of necessity so that ultraviolet radiation emitted from the welding arc does not damage the welder's eyes due to reflections off shiny objects in the peripheral field. Protective helmets such as a welding helmet restrict vision to an extremely small slot or hole, with no peripheral perception at all.

Generally, the peripheral field of a diving mask is improved if the lenses are as close to the eye as possible, or if the lenses are large, multi-window, or is a curved wrap-around design. For this type of mask the peripheral field of the diver is extremely limited. The lens is typically enclosed with an opaque black rubber sealing shell to keep out water. Underwater diving masks using a single flat transparent lens usually have the lens surface several centimeters from the eyes. Mask, goggle, and helmet users Д®xtremely large wide-field binoculars that would not be practical to carryДЄctivities which require a protective mask, safety goggles, or fully enclosing protective helmet can also result in an experience approximating tunnel vision. The eyeglass frame is capable of obscuring small objects and details in the peripheral field. The eyeglass frame also blocks the view of the world with a thin opaque boundary separating the lens area from the rest of the field of view. Where a naturally sighted person only needs to move their eyes to see an object far to the side or far down, the eyeglass wearer may need to move their whole head to point the eyeglasses towards the target object.

Mercury poisoning (especially methylmercury)Д®yeglass users experience tunnel vision to varying degrees due to the corrective lens only providing a small area of proper focus, with the rest of the field of view beyond the lenses being unfocused and blurry.

A bite from a black mamba and other snakes with the same strength venom.

Intense anger, causing the body to be rapidly flooded with adrenaline and oxygen.

Severe cataracts, causing a removal of most of the field of vision.

Prolonged exposure to air contaminated with heated hydraulic fluids and oils, as can sometimes happen in passenger aircraft (different from the so-called ' aerotoxic syndrome' which is not a recognized medical diagnosis and is claimed to happen with chronic exposure to substances from aircraft engines).

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 39В 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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