1. Related to, located in, or constituting an outer boundary or periphery.
2. Perceived or perceiving near the outer edges of the retina; such as, peripheral vision.
3. Of the surface or outer part of a body or organ; external.
4. Situated away from the center, as opposed to centrally located; for example, peripheral vision means the type of vision that allows one to see objects that are not in the center of one's visual field.
5. Relating to, or being part of the peripheral nervous system.
6. Of minor relevance or importance.
7. Auxiliary.

A wide range of disorders in which the nerves outside of the brain and spinal cord, peripheral nerves, have been damaged: "Peripheral neuropathy may be referred to as peripheral neuritis, or if many nerves are involved, the terms polyneuropathy or polyneuritis may be used."

"Nerve damage can arise from a number of causes; such as, disease, physical injury, poisoning, or malnutrition."

"Peripheral neuropathy ranges from a reversible problem to a potentially fatal complication. In the best cases, a damaged nerve regenerates. Nerve cells cannot be replaced if they are killed, but they are capable of recovering from damage."

The area of the visual field seen by the extramacular portions of the retina.

Extramacular refers to the outside part of the macula of the eye which is the small spot that is different from the surrounding tissue.