Peripheral / Periphary:
Relating to, or situated on the edge or periphery of something; circumferential, marginal, the outermost part or region within a precise boundary.
1. the boundary or perimeter of any surface or area.
2. the external surface of a body.
3. the outskirts of a city or urban area.
4. the minor or superficial aspects of a question
Peripheral vision is a part of vision that occurs outside the very center of gaze.