A medical condition that results in a loss of peripheral vision is known as Tunnel vision. With tunnel vision a person can only see objects from within a circular field.

Tunnel vision can be caused by:

    Extreme fear or distress, most often in the context of a panic attack.
    Blood loss to the brain, for example, can lead to tunnel vision
    A tumour pressing against the optic never fibres.
    Some eye diseases may also lead to tunnel vision such as Retinitis     Pigmentosa, an inherited condition that may ultimately lead to blindness.
    Glaucoma, a disease affecting the optic nerve, can also cause tunnel vision.

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