Tunnel Vision: What It Is, Causes & Treatment - Cleveland Clinic
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. Tunnel Vision
Beyond biology, "tunnel vision" also describes a physiological response to extreme stress or intense focus: Tunnel Vision: What It Is, Causes & Treatment
: Significant trouble seeing in low-light environments. Tunnel Vision: What It Is