Visual ray

a line from the eye, or point of sight.

See also: Visual

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References in classic literature ?
An individual who was standing beyond the railing, in the free space around the marble table, and whom no one had yet caught sight of, since his long, thin body was completely sheltered from every visual ray by the diameter of the pillar against which he was leaning; this individual, we say, tall, gaunt, pallid, blond, still young, although already wrinkled about the brow and cheeks, with brilliant eyes and a smiling mouth, clad in garments of black serge, worn and shining with age, approached the marble table, and made a sign to the poor sufferer.
Here matter new to gaze the Devil met Undazl'd, farr and wide his eye commands, For sight no obstacle found here, nor shade, But all Sun-shine, as when his Beams at Noon Culminate from th' AEQUATOR, as they now Shot upward still direct, whence no way round Shadow from body opaque can fall, and the Aire, No where so cleer, sharp'nd his visual ray To objects distant farr, whereby he soon Saw within kenn a glorious Angel stand, The same whom JOHN saw also in the Sun: His back was turnd, but not his brightness hid; Of beaming sunnie Raies, a golden tiar Circl'd his Head, nor less his Locks behind Illustrious on his Shoulders fledge with wings Lay waving round; on som great charge imploy'd Hee seemd, or fixt in cogitation deep.
Our Mysterious Visual Ray by Thomas Joseph Brown," http://aetherforce.
Perspective vision proposed by Alberti comprised visual rays extending from the eye to the canvas in the form of a pyramid and from the canvas, the pyramid projected to infinity.