Tunnel: Vision

: Significant trouble seeing in low-light environments.

Tunnel Vision: What It Is, Causes & Treatment - Cleveland Clinic Tunnel Vision

Tunnel vision, or the loss of peripheral vision, is a condition where your visual field is restricted to a small central area, much like looking through a tube or binoculars. It typically occurs when the "rod" cells in the retina, which are responsible for side and night vision, stop functioning correctly. : Significant trouble seeing in low-light environments

Tunnel vision is often a symptom of serious underlying eye conditions: Tunnel vision is often a symptom of serious

Beyond biology, "tunnel vision" also describes a physiological response to extreme stress or intense focus:

: Difficulty seeing objects or motion off to the side.

: High eye pressure damages the optic nerve, often starting with the outer edges of vision.