double refraction

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Related to double refraction: optic axis, Nicol prism


the act or process of refracting; specifically, the determination of the refractive errors of the eye and their correction with glasses.
the deviation of light in passing obliquely from one medium to another of different density.
cycloplegic refraction a type of static refraction, measured after lens accommodation is paralyzed by administration of cycloplegic eye drops.
double refraction refraction in which incident rays are divided into two refracted rays.
dynamic refraction refraction of the eye during accommodation.
ocular refraction the refraction of light produced by the media of the normal eye and resulting in the focusing of images upon the retina.
static refraction refraction of the eye when its accommodation is paralyzed.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

dou·ble re·frac·tion

the property of having more than one refractive index according to the direction of the transmitted light.
Synonym(s): birefringence
Farlex Partner Medical Dictionary © Farlex 2012

dou·ble re·frac·tion

(dŭb'ĕl rĕ-frak'shŭn)
The property of having more than one refractive index according to the direction of the transmitted light.
Synonym(s): birefringence.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


Property of anisotropic media such as crystals, whereby an incident light beam is split up into two beams, each plane polarized at right angles to the other. One beam, called ordinary, obeys Snell's law, while the other, called extraordinary, does not. Syn. double refraction. See anisotropic; law of refraction; Nicol prism; Wollaston prism.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
Attaining such double refraction, he grasps that his being and all other beings are discrete forms of a distributed power, gatherings of geometry and abyss.
For Huygens's description of his theory of double refraction, see Traite de la Lumiere, Great Books of the Western World, ed.
Therefore, because of calcite's unique optical properties such as double refraction, fluorescence, phosphorescence, thermo-luminescence and tribo-luminescence, it may be considered for future endeavors in makeup technology especially in nail polishes or even eye makeup.
Werner Kuhn (1899-1963), Swiss teacher and scientist, who among many other achievements in physical chemistry, first applied statistical considerations to the properties of macromolecules, and successfully accounted in this way for the elasticity and stress-induced double refraction of rubberlike materials.
Bartholin's discovery that Iceland spar showed double refraction and produced two rays of light (see 1669) had never been properly explained.
The phenomenon was therefore called double refraction.