Visual field and Visual image

Visual field noun - All of the points of the physical environment that can be perceived by a stable eye at a given moment.

Visual image and visual field are semantically related. In some cases you can use "Visual image" instead a noun phrase "Visual field".

Visual image noun - A mental image that is similar to a visual perception.

Visual field and visual image are semantically related. Sometimes you can replace phrase "Visual field" with "Visual image", this phrases are similar.