What type of vision should be used when scanning for traffic to avoid mid-air collisions?

When scanning for traffic to avoid mid-air collisions, focal vision is the type of vision that should be utilized. Focal vision is associated with the acute, detailed vision that allows individuals to focus on specific objects, which is essential for identifying other aircraft in the sky. This form of vision provides the clarity needed to discern the shapes, colors, and movements of other aerial vehicles, ensuring that pilots can effectively gauge distances and potential collision courses.

While peripheral vision is important for detecting motion outside of the central line of sight, its primary role involves awareness of the broader environment rather than focused detail. Central vision, which is often confused with focal vision, refers to the central part of the visual field that provides sharp images. However, it is the specific focus and attention to detail provided by focal vision that is crucial when actively scanning for traffic. Narrow vision isn't a recognized term in the context of aviation vision types and thus doesn't apply in this scenario.