Visual acuity and Visual modality

Visual acuity noun - Sharpness of vision; the visual ability to resolve fine detail (usually measured by a Snellen chart).

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

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

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