What is a narrow field of peripheral vision called?

A narrow field of peripheral vision is called tunnel vision. Tunnel vision is a condition where the peripheral vision is reduced, while central vision remains intact. This can be caused by a variety of factors, such as damage to the optic nerve, glaucoma, or retinal detachment. Tunnel vision can make it difficult to see objects that are not directly in front of the person, and can make it difficult to walk or drive.