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| A-mode | amplitude mode; amplitude modulation |
|---|---|
| AC/A | accommodative convergence/accommodation [ratio] |
| CI | cardiac index; cardiac insufficiency; cell immunity; cell inhibition; cephalic index; cerebral infar... |
| conv | convalescence, convalescent, convalescing; convergence, convergent; convulsions, convulsive |
| converg | convergence, convergent |
| AC/A | accommodative convergence/accommodation |
|---|---|
| APA | AP amplitude |
| APA | Action potential amplitude |
| A | Amplitude |
| AMFR | Amplitude Modulation Following Responses |
| amplitude of convergence | The distance between the near point and far point of convergence. Synonym: range of convergence. (05 Mar 2000) |
|---|---|
| amplitude | 1. State of being ample; extent of surface or space; largeness of dimensions; size. "The cathedral of Lincoln . . . Is a magnificent structure, proportionable to the amplitude of the diocese." (Fuller) 2. Largeness, in a figurative sense; breadth; abundance; fullness. Of extent of capacity or intellectual powers. "Amplitude of mind." . "Amplitude of comprehension." . Of extent of means or resources. "Amplitude of reward." . 3. <astronomy> The arc of the horizon between the true east or west point and the center of the sun, or a star, at its rising or setting. At the rising, the amplitude is eastern or ortive: at the setting, it is western, occiduous, or occasive. It is also northern or southern, when north or south of the equator. The arc of the horizon between the true east or west point and the foot of the vertical circle passing through any star or object. 4. The horizontal line which measures the distance to which a projectile is thrown; the range. 5. <physics> The extent of a movement measured from the starting point or position of equilibrium; applied especially to vibratory movements. 6. <mathematics> An angle upon which the value of some function depends; a term used more especially in connection with elliptic functions. Magnetic amplitude, the angular distance of a heavenly body, when on the horizon, from the magnetic east or west point as indicated by the compass. The difference between the magnetic and the true or astronomical amplitude (see 3 above) is the "variation of the compass." Origin: L. Amplitudo, fr. Amplus: cf. F. Amplitude. See Ample. Source: Websters Dictionary (01 Mar 1998) |
| amplitude of accommodation | The difference in refractivity of the eye at rest and when fully accommodated. (05 Mar 2000) |
| amplitude of pulse | See: average pulse magnitude, peak magnitude. (05 Mar 2000) |
| phase-amplitude contrast | <microscopy> The separation and recombination of direct vs. Diffracted rays in a light microscope adjusted to Kohler illumination. at the lower focal plane of the condenser there is an annular diaphragm with an opaque central stop. Through this diaphragm rays are focused as a hollow cone onto the specimen. In the back focal plane of the objective there is a conjugate annular diaphragm (phase plate). If here the undiffracted rays are retarded (by a transparent film of proper thickness on the annulus of the phase plate), bright contrast results. If, instead, the phase-delay film is on the central spot, dark contrast results. With either a bright or a dark-contrast phase plate, the annulus is usually coated with a partially absorbing (very thin) film of silver (Zernike method) or carbon soot (Wilska method) to reduce the higher amplitude (intensity) of the undiffracted rays. (05 Aug 1998) |
| minimal amplitude nystagmus | Nystagmus of so small an amplitude that it is not detected by the usual clinical tests. Synonym: minimal amplitude nystagmus. Origin: micro-+ G. Nystagmos, a nodding (05 Mar 2000) |
| half amplitude pulse duration | The time, in milliseconds, required for a wave form to reach half of its full magnitude. (05 Mar 2000) |
| tidal amplitude | The magnitude of the difference in elevation between low and high tides at a particular point in a body of water. (09 Oct 1997) |
| accommodative convergence | The meter angle of convergence expressed in diopters; equal to the product of the meter angles of convergence times the interpupillary distance measured in centimeters. (05 Mar 2000) |
| accommodative convergence-accommodation ratio | The amount of convergence (measured in prism diopters of convergence) divided by the amount of accommodation (measured in diopters) required to direct both eyes upon an object. (05 Mar 2000) |
| angle of convergence | <optics> The angle that the visual axis makes with the median line when a near object is viewed. (05 Mar 2000) |
| range of convergence | The distance between the near point and far point of convergence. Synonym: range of convergence. (05 Mar 2000) |
| convergence | <microscopy> In colour video cameras and monitors, the precise alignment of the images or pictures in the three primary colours (red, green and blue). A lack of convergence gives rise to asymmetrically coloured fringes. (05 Aug 1998) |
| convergence excess | That condition in which an oesophoria or esotropia is greater for near vision than for far vision. (05 Mar 2000) |
| convergence insufficiency | That condition in which an oesophoria or esotropia is more marked for far vision than for near vision. (05 Mar 2000) |
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