error of refraction

error of refraction
refractive error deviation from optimal focusing of light (emmetropia) by the lens of the eye onto the retina, such as myopia, hyperopia, astigmatism, or anisometropia.

Medical dictionary. 2011.

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  • error refractivo — Eng. Refraction error Potencia dióptrica necesaria para conseguir la emetropía …   Diccionario de oftalmología

  • Automated Refraction System — An automated refraction system is a group of ophthalmic devices used during an eye examination to aid in the determination of a person s refractive error and prescription for glasses or contact lenses. The standard components of an automated… …   Wikipedia

  • Index error — Index In dex, n.; pl. E. {Indexes}, L. {Indices}(?). [L.: cf. F. index. See {Indicate}, {Diction}.] [1913 Webster] 1. That which points out; that which shows, indicates, manifests, or discloses; as, the increasing unemployment rate is an index of …   The Collaborative International Dictionary of English

  • Index of refraction — Index In dex, n.; pl. E. {Indexes}, L. {Indices}(?). [L.: cf. F. index. See {Indicate}, {Diction}.] [1913 Webster] 1. That which points out; that which shows, indicates, manifests, or discloses; as, the increasing unemployment rate is an index of …   The Collaborative International Dictionary of English

  • Doppler error — In using Doppler radar, the error in the measurement of target radial velocities as a result of atmospheric refraction. These errors result, first, from the assumption of a constant wave velocity for a nonhomogeneous atmosphere and, second, the… …   Aviation dictionary

  • coastal refraction — One of the errors in a direction finder resulting from the change in the direction of travel of a radio ground wave as it passes from one medium to another (i.e., from land to sea or from sea to land). Also called land effect, shoreline effect,… …   Aviation dictionary

  • azimuth error — As it pertains to radar, the bearing error due to horizontal refraction …   Aviation dictionary

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