Tunnel vision and Vision defect

Tunnel vision noun - Visual impairment involving a loss of peripheral vision.

Vision defect and tunnel vision are semantically related. In some cases you can use "Vision defect" instead a noun phrase "Tunnel vision".

Vision defect noun - Impairment of the sense of sight.

Tunnel vision and vision defect are semantically related. Sometimes you can replace phrase "Tunnel vision" with "Vision defect", this phrases are similar.