Definition of tunnel vision

The phrase "tunnel vision" is a metaphorical expression that describes a narrow and restricted focus on a specific issue or task, to the exclusion of other relevant considerations. The origin of this term can be traced back to the early 1900s, when it was commonly used to describe the myopia experienced by people working in underground tunnels. In the tunneling industry, workers often suffered from a condition called "tunnel myopia," which was characterized by a decreased ability to see objects clearly at a distance. The restricted space and low light levels in tunnels compounded the natural physiological changes that occur in the eye in that environment, leading to a tightening of the visual field and reduced peripheral vision. As the term "tunnel vision" became more widely recognized, it began to be applied metaphorically to describe a similar narrowing of focus and perspective in other contexts, such as decision-making or problem-solving. In these situations, tunnel vision can cause individuals to overlook important details, fail to consider all available options, and become too entrenched in their original viewpoint, leading to less effective decision-making and reduced problem-solving capabilities.