Point of sight

(Persp.) in a perspective drawing, the point assumed as that occupied by the eye of the spectator.

See also: Point

References in classic literature ?
The wood had been cleared and opened to improve this point of sight, and the bright sunny landscape beyond was so beautiful that I rested there at least once every day.
In theory, we know that "in using both eyes we introduce more than one point of sight, which renders the perspective false.
Of course, the point of sights is to hit the mark, so accuracy is the single most important feature of the airgun.