amplitude of accommodation

  • 1Amplitude of accommodation — (AA) is a measurement of the eye’s ability to focus clearly on objects at near distances (i.e. accommodation). This eye focusing range for a child is usually about 5 ndash;7.5 cm (2 ndash;3 inches). For a young adult, it is 10 ndash;15 cm (4… …

    Wikipedia

  • 2amplitude 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

  • 3amplitude of accommodation — 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 …

    Useful english dictionary

  • 4Accommodation (eye) — Accommodation is the process by which the increases optical power to maintain a clear image (focus) on an object as it draws near the eye. The young human eye can change focus from distance to 7 cm from the eye in 350 milliseconds. This dramatic… …

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  • 5accommodation — [ akɔmɔdasjɔ̃ ] n. f. • XIVe « prêt gratuit » (cf. accommodement); de accommoder 1 ♦ (1566) Action d accommoder ou de s accommoder (aux circonstances, aux individus). ⇒ adaptation. 2 ♦ Physiol. Aptitude de l œil à accommoder (III). L amplitude d… …

    Encyclopédie Universelle

  • 6amplitude — [ ɑ̃plityd ] n. f. • XVe; lat. amplitudo 1 ♦ Vx Grandeur, étendue. « Dans l amplitude et immensité de la nature » (Pascal). 2 ♦ Sc. Différence entre les valeurs extrêmes d une grandeur. Amplitude d un intervalle borné : distance entre les bornes …

    Encyclopédie Universelle

  • 7Accommodation — In medicine, the ability of the eye to change its focus from distant to near objects (and vice versa). This process is achieved by the lens changing its shape. Accommodation is the adjustment of the optics of the eye to keep an object in focus on …

    Medical dictionary

  • 8Negative relative accommodation — (NRA) was proposed by Prof. Joseph Kearney of Oxford University in 1967, is a measure of the maximum ability to relax accommodation while maintaining clear, single binocular vision.[1] This measurement is typically obtained by an orthoptist,… …

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  • 9Positive relative accommodation — (PRA) is a measure of the maximum ability to stimulate accommodation while maintaining clear, single binocular vision [http://www.vision therapy.com/Glossary of Terms.htm] . This measurement is typically obtained by an ophthalmologist or… …

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  • 10Spasm of accommodation — A spasm of accommodation (also known as an accommodation, or accommodative, spasm) is a condition in which the ciliary muscle of the eye remains in a constant state of contraction. Normally, this contraction bends the lens to allow the eye to… …

    Wikipedia

  • 11range of accommodation — n the range through which accommodation is able to adjust the optical system of the eye so that an image falls in sharp focus on the retina: the distance between the near point and the far point of the eye * * * the alteration in the refractive… …

    Medical dictionary

  • 12limit of accommodation — 1. : amplitude of accommodation 2. : range of accommodation …

    Useful english dictionary

  • 13VISION — «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

  • 14ŒIL HUMAIN — L’œil est l’organe de la vision (cf. VI SION Physiologie); récepteur des phénomènes lumineux, l’œil les focalise pour projeter l’image sur la rétine qu’il renferme. Celle ci, à son tour, analyse cette image, commence à la coder et, par… …

    Encyclopédie Universelle

  • 15presbytie — [ prɛsbisi ] n. f. • 1820; presbyopie 1793; de presbyte ♦ Anomalie de la vision, défaut d un œil qui distingue mal les objets rapprochés, par suite d une diminution de l élasticité du cristallin et de son pouvoir d accommodation, ou du… …

    Encyclopédie Universelle

  • 16Eye examination — An eye examination is a battery of tests performed by an optometrist or ophthalmologist assessing vision and ability to focus on and discern objects, as well as other tests and examinations pertaining to the eyes.All people should have periodic… …

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  • 17Hyperopia — Farsightedness; the ability to see distant objects more clearly than close objects. Hyperopia may be corrected with glasses or contact lenses. * * * Longsightedness; that optical condition in which only convergent rays can be brought to focus on… …

    Medical dictionary

  • 18Vision therapy — Vision therapy, also known as visual training, vision training, or visual therapy, is a broad group of techniques aimed at correcting and improving binocular, oculomotor, visual processing, and perceptual disorders. [1] Contents 1 Historical… …

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  • 19Dioptre — This article is about the unit of measure in optics. For other uses, see Diopter (disambiguation). A dioptre, or diopter, is a unit of measurement of the optical power of a lens or curved mirror, which is equal to the reciprocal of the focal… …

    Wikipedia

  • 20Myopia — Nearsightedness, the ability to see close objects more clearly than distant objects. Myopia can be caused by a longer than normal eyeball or by any condition that prevents light rays from focusing on the retina. Most forms of myopia can be… …

    Medical dictionary