Arc of vision

Arc of vision
Vision Vi"sion, n. [OE. visioun, F. vision, fr. L. visio, from videre, visum, to see: akin to Gr. ? to see, ? I know, and E. wit. See {Wit}, v., and cf. {Advice}, {Clairvoyant}, {Envy}, {Evident}, {Provide}, {Revise}, {Survey}, {View}, {Visage}, {Visit}.] 1. The act of seeing external objects; actual sight. [1913 Webster]

Faith here is turned into vision there. --Hammond. [1913 Webster]

2. (Physiol.) The faculty of seeing; sight; one of the five senses, by which colors and the physical qualities of external objects are appreciated as a result of the stimulating action of light on the sensitive retina, an expansion of the optic nerve. [1913 Webster]

3. That which is seen; an object of sight. --Shak. [1913 Webster]

4. Especially, that which is seen otherwise than by the ordinary sight, or the rational eye; a supernatural, prophetic, or imaginary sight; an apparition; a phantom; a specter; as, the visions of Isaiah. [1913 Webster]

The baseless fabric of this vision. --Shak. [1913 Webster]

No dreams, but visions strange. --Sir P. Sidney. [1913 Webster]

5. Hence, something unreal or imaginary; a creation of fancy. --Locke. [1913 Webster]

{Arc of vision} (Astron.), the arc which measures the least distance from the sun at which, when the sun is below the horizon, a star or planet emerging from his rays becomes visible.

{Beatific vision} (Theol.), the immediate sight of God in heaven.

{Direct vision} (Opt.), vision when the image of the object falls directly on the yellow spot (see under {Yellow}); also, vision by means of rays which are not deviated from their original direction.

{Field of vision}, field of view. See under {Field}.

{Indirect vision} (Opt.), vision when the rays of light from an object fall upon the peripheral parts of the retina.

{Reflected vision}, or {Refracted vision}, vision by rays reflected from mirrors, or refracted by lenses or prisms, respectively.

{Vision purple}. (Physiol.) See {Visual purple}, under {Visual}. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Vision — Vi sion, n. [OE. visioun, F. vision, fr. L. visio, from videre, visum, to see: akin to Gr. ? to see, ? I know, and E. wit. See {Wit}, v., and cf. {Advice}, {Clairvoyant}, {Envy}, {Evident}, {Provide}, {Revise}, {Survey}, {View}, {Visage}, {Visit} …   The Collaborative International Dictionary of English

  • Vision purple — Vision Vi sion, n. [OE. visioun, F. vision, fr. L. visio, from videre, visum, to see: akin to Gr. ? to see, ? I know, and E. wit. See {Wit}, v., and cf. {Advice}, {Clairvoyant}, {Envy}, {Evident}, {Provide}, {Revise}, {Survey}, {View}, {Visage},… …   The Collaborative International Dictionary of English

  • VISION — «Toute la conduite de notre vie dépend de nos sens, entre lesquels celui de la vue étant le plus universel et le plus noble. Il n’y a point de doute que les inventions qui servent à augmenter sa puissance ne soient des plus utiles qui puissent… …   Encyclopédie Universelle

  • Vision span — or perceptual span is the angular span (vertically and horizontally), within which the human eye has sharp enough vision to read text. The visual field of the human eye spans approximately 120 degrees of arc. However, most of that arc is… …   Wikipedia

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