Achromatic vision and Visual modality

Achromatic vision noun - Vision using the rods.

Visual modality and achromatic vision are semantically related. In some cases you can use "Visual modality" instead a noun phrase "Achromatic vision".

Visual modality noun - The ability to see; the visual faculty.

Achromatic vision and visual modality are semantically related. Sometimes you can replace phrase "Achromatic vision" with "Visual modality", this phrases are similar.