| binocular parallax | The difference in the angles formed by the lines of sight to two objects situated at different distances from the eyes; a factor in the visual perception of depth. Synonym: stereoscopic parallax. (05 Mar 2000) |
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| parallax | 1. The apparent displacement, or difference of position, of an object, as seen from two different stations, or points of view. 2. <astronomy> The apparent difference in position of a body (as the sun, or a star) as seen from some point on the earth's surface, and as seen from some other conventional point, as the earth's center or the sun. Annual parallax, the greatest value of the heliocentric parallax, or the greatest annual apparent change of place of a body as seen from the earth and sun; as, the annual parallax of a fixed star. Binocular parallax, the apparent difference in position of an object as seen separately by one eye, and then by the other, the head remaining unmoved. Diurnal, or Geocentric, parallax, the parallax of a body with reference to the earth's center. This is the kind of parallax that is generally understood when the term is used without qualification. Heliocentric parallax, the parallax of a body with reference to the sun, or the angle subtended at the body by lines drawn from it to the earth and sun; as, the heliocentric parallax of a planet. Horizontal parallax, the geocentric parallx of a heavenly body when in the horizon, or the angle subtended at the body by the earth's radius. Optical parallax, the apparent displacement in position undergone by an object when viewed by either eye singly. Parallax of the cross wires (of an optical instrument), their apparent displacement when the eye changes its position, caused by their not being exactly in the focus of the object glass. Stellar parallax, the annual parallax of a fixed star. Origin: Gr. Alternation, the mutual inclination of two lines forming an angle, fr. To change a little, go aside, deviate; beside, beyond + to change: cf. F. Parallaxe. Cf. Parallel. Source: Websters Dictionary (01 Mar 1998) |
| parallax method | Localization of a foreign body by observing the direction of its motion on a fluoroscopic screen while moving the X-ray tube or the screen. (05 Mar 2000) |
| parallax test | Measurement of the deviation in strabismus by the alternate cover test combined with neutralization of the deviation using prisms. (05 Mar 2000) |
| vertical parallax | The relative vertical displacement of the image when each eye is closed in turn; seen in vertical diplopia, or heterophoria. (05 Mar 2000) |
| heteronymous parallax | The apparent movement of an object toward the closed eye; noted in exophoria. (05 Mar 2000) |
| homonymous parallax | The apparent movement of an object toward the open eye when one is closed; noted in oesophoria. (05 Mar 2000) |
| stereoscopic parallax | The difference in the angles formed by the lines of sight to two objects situated at different distances from the eyes; a factor in the visual perception of depth. Synonym: stereoscopic parallax. (05 Mar 2000) |
| axial view | Radiographic projection devised to obtain direct visualization of the base of the skull. Synonym: axial view, base projection, submental vertex projection, submentovertical projection, verticosubmental view. (05 Mar 2000) |
| base view | A radiographic projection showing the base of the skull, positions of the mandibular condyles, and zygomatic arches. Synonym: base view, submental vertex radiograph. (05 Mar 2000) |
| by-view | A private or selfish view; self-interested aim or purpose. "No by-views of his own shall mislead him." (Atterbury) Source: Websters Dictionary (01 Mar 1998) |
| Caldwell view | Inclined PA radiographic projection devised to permit visualization of orbital structures unobstructed by the petrous ridges. Synonym: Caldwell view. (05 Mar 2000) |
| verticosubmental view | Radiographic projection devised to obtain direct visualization of the base of the skull. Synonym: axial view, base projection, submental vertex projection, submentovertical projection, verticosubmental view. (05 Mar 2000) |
| view | 1. The act of seeing or beholding; sight; look; survey; examination by the eye; inspection. "Thenceforth I thought thee worth my nearer view." (Milton) "Objects near our view are thought greater than those of a larger size are more remote." (Locke) "Surveying nature with too nice a view." (Dryden) 2. Mental survey; intellectual perception or examination; as, a just view of the arguments or facts in a case. "I have with exact view perused thee, Hector." (Shak) 3. Power of seeing, either physically or mentally; reach or range of sight; extent of prospect. "The walls of Pluto's palace are in view." (Dryden) 4. That which is seen or beheld; sight presented to the natural or intellectual eye; scene; prospect; as, the view from a window. "'T is distance lends enchantment to the view." (Campbell) 5. The pictorial representation of a scene; a sketch, ither drawn or painted; as, a fine view of Lake George. 6. Mode of looking at anything; manner of apprehension; conception; opinion; judgment; as, to state one's views of the policy which ought to be pursued. "To give a right view of this mistaken part of liberty." (Locke) 7. That which is looked towards, or kept in sight, as object, aim, intention, purpose, design; as, he did it with a view of escaping. "No man sets himself about anything but upon some view or other which serves him for a reason." (Locke) 8. Appearance; show; aspect. "[Graces] which, by the splendor of her view Dazzled, before we never knew." (Waller) Field of view. See Field. Point of view. See Point. To have in view, to have in mind as an incident, object, or aim; as, to have one's resignation in view. View halloo, the shout uttered by a hunter upon seeing the fox break cover. View of frankpledge, the inspection by the jury of the place where a litigated transaction is said to have occurred. Origin: OF. Veue, F. Vue, fr. OF. Veoir to see, p. P. Veu, F. Voir, p. P. Vu, fr. L. Videre to see. See Vision, and cl. Interview, Purview, Review, Vista. Source: Websters Dictionary (01 Mar 1998) |
| phagocytosis view phagocytosis | The process by which a cell is engulfed and broken down by another for purposes of defense or sustenance.The uptake of extracullular materials by the formation of a pocket from the cellular membrane and its subsequent pinching off.Compare endocytosis and pinocytosis. (09 Oct 1997) |