near point


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Related to near point: far point, Near point of convergence

point

 [point]
1. a small area or spot; the sharp end of an object.
2. to approach the surface, like the pus of an abscess, at a definite spot or place.
3. a tapered, pointed endodontic instrument used for exploring the depth of the root canal in root canal therapy; called also root canal point.
point A a radiographic, cephalometric landmark, determined on the lateral head film; it is the most retruded part of the curved bony outline from the anterior nasal spine to the crest of the maxillary alveolar process.
absorbent point in root canal therapy, a cone of variable width and taper, usually made of paper or a paper product, used to dry or maintain a liquid disinfectant in the canal. Called also paper point.
point B a radiographic, cephalometric landmark, determined on the lateral head film; it is the most posterior midline point in the concavity between the infradentale and pogonion.
boiling point the temperature at which a liquid will boil; at sea level the boiling point of water is 100°C (212°F).
cardinal p's
1. the points on the different refracting media of the eye that determine the direction of the entering or emerging light rays.
2. four points within the pelvic inlet— the two sacroiliac articulations and the two iliopectineal eminences.
craniometric p's the established points of reference for measurement of the skull.
dew point the temperature at which moisture in the atmosphere is deposited as dew.
far point the most remote point at which an object is clearly seen when the eye is at rest.
point of fixation
1. the point or object on which one's sight is fixed and through which the axis opticus passes.
2. the point on the retina, usually the fovea, on which are focused the rays coming from an object directly regarded.
freezing point the temperature at which a liquid begins to freeze, for water, 0°C (32°F); it is often used interchangeably with melting point, but should be used for substances being cooled while melting point is reserved for substances being heated.
gutta-percha point gutta-percha cone.
ice point the true melting point of ice, being the temperature of equilibrium between ice and air-saturated water under one atmosphere pressure.
isoelectric point (pI) the pH of a solution in which molecules of a specific substance, such as a protein, have equal numbers of positively and negatively charged groups and therefore do not migrate in an electric field.
J point on an electrocardiogram, the junction between the end of the QRS segment and the beginning of the ST segment.
jugal point the point at the angle formed by the masseteric and maxillary edges of the zygomatic bone; called also jugale.
lacrimal point a small aperture on a slight elevation at the medial end of the eyelid margin, through which tears from the lacrimal lake enter the lacrimal canaliculi. See also lacrimal apparatus.
point of maximal impulse the point on the chest where the impulse of the left ventricle is sometimes felt or seen most strongly, normally in the fifth costal interspace inside the mammillary line.
McBurney point a point of special tenderness in appendicitis, about 4 to 5 cm from the right anterior iliac spine on a line between the spine and the navel; it corresponds to the normal position of the appendix.
McBurney's point is located midway between the anterior iliac crest and the umbilicus in the right lower quadrant. From Ignatavicius and Workman, 2002.
melting point (mp) the minimum temperature at which a solid begins to liquefy; see also freezing point.
near point the nearest point of clear vision, the absolute near point being that for either eye alone with accommodation relaxed, and the relative near point being that for the two eyes together with employment of accommodation.
nodal p's two points on the axis of an optical system situated so that a ray falling on one will produce a parallel ray emerging through the other.
paper point absorbent point.
pressure point
1. a point of extreme sensitivity to pressure.
2. one of various locations on the body at which digital pressure may be applied for the control of hemorrhage.
Locations of pressure points. Shaded areas show the regions in which hemorrhage may be controlled by pressure at the points indicated.
root canal point point (def. 3).
silver point in root canal therapy, a tapered and elongated silver plug that is cemented into the canal as a filling. Called also silver cone.
trigger point a spot on the body at which pressure or other stimulus gives rise to specific sensations or symptoms.
triple point the temperature and pressure at which the solid, liquid, and gas phases of a substance are in equilibrium.

near point

that point in conjugate focus with the retina when the eye exerts maximal accommodation.
Synonym(s): punctum proximum

near point

n.
The nearest point at which an object can be seen distinctly by the eye.

near point

(nēr poynt)
That point in conjugate focus with the retina when the eye exerts maximal accommodation.

near point

The shortest distance from the eye at which fine detail can be sharply perceived. Except in short-sighted (myopic) people, the near point moves progressively further away with age. Reading glasses will generally be needed when the near point exceeds about 40 cm.
References in periodicals archive ?
Abbreviations: ANOVA = analysis of variance, AP = associated phoria, CI = convergence insufficiency, FD = fixation disparity, LED = light-emitting diode, mTBI = mild traumatic brain injury, NPC = near point of convergence, PA = prism adaptation, PD = prism diopter, PFV = positive fusional vergence, PRII = Power Refractor II, PRV = positive relative vergence, SEM = standard error of the mean, SUNY = State University of New York, TBI = traumatic brain injury, VA = Department of Veterans Affairs.
The engine of the vessel, which was being used on a diving trip, broke down near Point Lynas in Amlwch on Saturday and Moelfre RNLI lifeboat launched at 2.
Starring Drew Barrymore and John Krasinski, the movie is based on the true story of three gray whales that were discovered trapped in ice near Point Barrow, Alaska, in 1988 and became a worldwide media sensation.
As many as 15,000 walruses began crowding the shore near Point Lay, Alaska, in August and are just starting to disperse as ice forms in chilly fall weather, federal biologists said.
During the network's peak activity, in 1980, more than 900 monitors were positioned near point sources, along roadsides, and in urban locations.
Sections of the former road have split apart during landslides at the cliff near Point Fermin.
And just as the solace of half time beckoned Ghana got what seemed was their inevitable reward for all their hard work when Agogo slotted home rather clumsily from near point blank range after Quincy Owusu Abeyie's cross from the right four minutes from the interval.
Maritimes has signed agreements with Anadarko Petroleum Corporation to transport 813,000 MMBtu/day of natural gas from the proposed Bear Head LNG terminal near Point Tupper, Nova Scotia; and with Repsol YPF to transport 750,000 MMBtu/day of natural gas from the proposed Canaport LNG terminal near Saint John, New Brunswick.
Jobless Mr Walker, aged 22, from Bromford, was hit at least five times at near point blank range.
Thirteen years ago, two young families were killed near Point Deception in Northern California.