What defines the primary characteristic of tunnel vision?

Tunnel vision is defined primarily by the loss of peripheral vision. This condition gives the individual a narrowed field of vision, much like looking through a tunnel. While the central vision may remain intact, the ability to see objects outside of that central focus is significantly compromised. This loss can make it difficult for individuals to perceive their surroundings accurately, as they may struggle to notice objects or movements occurring outside their direct line of sight.

This is particularly important in various contexts, such as driving or navigating crowded spaces, where peripheral awareness is crucial for safety. The other options deal with different aspects of vision; for instance, loss of central vision typically refers to conditions such as macular degeneration, while color recognition and night vision issues pertain to entirely different visual impairments. Thus, the characteristic of tunnel vision directly correlates with the loss of peripheral vision, leading to its distinct symptoms and challenges.