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refracting power

См. также в других словарях:

  • diopter — The unit of refracting power of lenses, denoting the reciprocal of the focal length expressed in meters. [G. dioptra, a leveling instrument] prism d. (p.d.) the unit of measurement of the deviation of light in passing through a prism, be …   Medical dictionary

  • Lighthouse — For other uses, see Lighthouse (disambiguation). Speculative drawing (c. 2006) of the Lighthouse of Alexandria, on the island of Pharos …   Wikipedia

  • refract — transitive verb Etymology: Latin refractus, past participle of refringere to break open, break up, from re + frangere to break more at break Date: 1612 1. a. to subject (as a ray of light) to refraction b. to alter or distort as if by refraction… …   New Collegiate Dictionary

  • Dulong, Pierre-Louis — ▪ French scientist born Feb. 12, 1785, Rouen, Fr. died July 18, 1838, Paris  chemist and physicist who helped formulate the Dulong–Petit law of specific heats (1819), which proved useful in determining atomic weights.       He was an assistant to …   Universalium

  • Refract — In ophthalmology, to determine the bending of light that takes place within the human eye. Refractive errors include nearsightedness (myopia), farsightedness (hyperopia), and astigmatism. Lenses can be used to control the amount of refraction,… …   Medical dictionary

  • ophthalmoscope — A device for studying the interior of the eyeball through the pupil. SYN: funduscope. [ophthalmo + G. skopeo, to examine] binocular o. an o. that provides a stereoscopic view of the fundus. demonstration o. an o. by which the fundus may be seen… …   Medical dictionary

  • refractionist — A person trained to measure the refraction of the eye and to determine the proper corrective lenses. * * * re·frac·tion·ist shə nəst n a person (as an optometrist) skilled in the practical application of the laws of refraction esp. to the… …   Medical dictionary

  • toric — Relating to, or having the curvature of, a torus. * * * to·ric tōr ik, tȯr adj of, relating to, or shaped like a torus or segment of a torus specif being a simple lens having for one of its surfaces a segment of an equilateral zone of a torus… …   Medical dictionary

  • amplitude of accommodation — n the difference between the refracting power of the eye when adjusted for vision at the far point and when adjusted for vision at the near point * * * range of accommodation; see under range …   Medical dictionary

  • corneal astigmatism — astigmatism due to irregularity in the curvature or refracting power of the cornea …   Medical dictionary

  • meter lens — a converging lens with a focal length of one meter and a refracting power of one diopter …   Medical dictionary

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