visual range


Also found in: Dictionary, Thesaurus.
Related to visual range: Beyond Visual Range missile

visual range

[′vizh·ə·wəl ′rānj]
(meteorology)
The distance, under daylight conditions, at which the apparent contrast between a specified type of target and its background becomes just equal to the threshold contrast of an observer.
References in periodicals archive ?
It could come into visual range at the end of 2012, and will reach around 9th magnitude near its perihelion in March.
Runway Visual Range is a calculated assessment of the distance that a pilot can see down a runway, taking into account prevailing weather conditions as well as ambient light levels and runway light settings.
Avoid sunglasses with heavy frames in preference to those with slim arms that provide the greatest allround vision, bearing in mind that all drivers need a visual range of at least 120 degrees.
Avoid sunglasses with heavy frames in preference to those with slim arms that provide the greatest all-round vision, bearing in mind that all drivers need a visual range of at least 120 degrees.
Transmission relays will be installed along the runway to determine the runway visual range.
The cameras have a visual range of 250ft and can zoom in to identify faces.
Those supplied to Coventry Airport are internally illuminated quartz halogen units for use on occasions when the Runway Visual Range is less than 800m.
The visual range of the driver is extended by about 10 metres so that other road-users and obstacles are spotted sooner.
Doing a complete rebraiding of a 10-year-old's elbow-length tresses or letting a preteen examine the contents of her mother's purse, lipstick by lipstick, is annoying for anyone within visual range.
Hunters use specially adapted high-powered rifles with scopes that allow them to be out of visual range of the dogs when they shoot.
On the contrary, its visual range demonstrates the systematic nature of their explorations across the media spectrum.
During World War I, armies on both sides used sound location to detect enemy aircraft flying out of visual range.