Sights and Visual modality

Sights noun - An optical instrument for aiding the eye in aiming, as on a firearm or surveying instrument.

Visual modality is a synonym for sights. In some cases you can use "Visual modality" instead a noun "Sights".

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

Sights is a synonym for visual modality. Sometimes you can replace term "Sights" with "Visual modality", this terms are similar.