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It means you focus intently on one thing (in this case getting the job done) to the exclusion of all peripheral issues (in this case the danger you face)

Define Tunnel Vision

Tunnel Vision Definition

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what's the meaning of "tunnel vision"?

the context for this usage is about the description of the miners' response after the recent mining disaster in US. the original sentence is sth. like: "if the miners don't have tunnel vision, if they don't have the day-to-day ( to do ), they would totally lost ..."

To have a "Tunnel vision" means to have a very narrow point of view, unwilling to see the problem in a broader perspective; here the miners were seeing it only from their own selfish and narrow point of view.

1. a drastically narrowed field of vision, as in looking through a tube, symptomatic of retinitis pigmentosa.

2. an extremely narrow or prejudiced outlook; narrow-mindedness.

http://dictionary.infoplease.com/tunnel-vision

In medical terms, tunnel vision is the loss of peripheral vision with retention of central vision, resulting in a constricted circular tunnel-like field of vision.[1]

Tunnel vision can be caused by:

Blood loss (hypovolemia)

Alcohol consumption causes tunnel vision [2]. 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.

Sustained (1 second or more) high accelerations[3]. 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 or g-force induced Loss Of Consciousness (g-LOC).

Hallucinogenic drugs, in particular the Dissociatives.

Glaucoma, a disease of the eye.

Extreme fear or distress, most often in the context of a panic attack.

During periods of high adreneline production, such as an intense physical fight.

Altitude sickness, hypoxia in passenger aircraft[4]

Exposure to oxygen at a partial pressure above 1.5-2 atmospheres, producing central nervous system oxygen toxicity, notably while diving.[5] 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[6].

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

A bite from a Black Mamba and other snakes with the same strength venom.

When combined with piloting an aircraft, driving, crossing roads or operating heavy machinery, the consequences can be fatal.

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