| 释义 |
optic axis
optic axisn. An optical path through a crystal along which a ray of light can pass without undergoing double refraction.optic axis n (General Physics) the direction in a uniaxial crystal or one of the two directions in a biaxial crystal along which a ray of unpolarized light may pass without undergoing double refraction op′tic ax′is
n. the direction or directions in a crystal along which light is not doubly refracted. [1655–65] Thesaurus| Noun | 1. | optic axis - in a doubly refracting crystal, the line in the direction of which no double refraction occurs; "a crystal may have either one or two optic axes"axis - a straight line through a body or figure that satisfies certain conditions | | 2. | optic axis - a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted; "in a normal eye the optic axis is the direction in which objects are seen most distinctly"principal axisaxis - a straight line through a body or figure that satisfies certain conditions |
optic axis
optic axis[′äp·tik ′ak·səs] (optics) The axis in a doubly refracting medium in which the ordinary and extraordinary waves propagate with the same velocity, and double refraction vanishes. Also known as optical axis; principal axis. optic axis
axis [ak´sis] (pl. ax´es) 1. a line through a center of a body, or about which a structure revolves.the second cervical vertebra. adj., adj ax´ial.2. the position of the cylindrical part of a lens, used for correcting astigmatism; the range of values is from 0° to 180°.celiac axis celiac trunk.dorsoventral axis one passing from the posterior to the anterior surface of the body.electrical axis of heart the preponderant direction of current flow through the heart, a consequence of the electromotive forces within the heart. It may be computed on either an instantaneous basis or a mean basis.frontal axis an imaginary line running from right to left through the center of the eyeball.axis of heart a line passing through the center of the base of the heart to the apex.instantaneous electrical axis the electrical axis of the heart determined at a given point in time.lead axis the imaginary direct line between the two electrodes of the bipolar leads or between the positive electrode and the reference point of the unipolar leads.mean electrical axis the average direction of the activation or repolarization process during the cardiac cycle; it may be determined for any deflection (P, QRS, ST-T) and in the frontal, transverse, or sagittal plane.optic axis 1. a line connecting the center of the anterior curvature of the cornea (anterior pole) with that of the posterior curvature of the sclera (posterior pole).2. the hypothetical straight line passing through the centers of curvature of the front and back surfaces of a simple lens.phlebostatic axis a point located by drawing an imaginary line from the fourth intercostal space at the sternum and finding its intersection with an imaginary line drawn down the center of the chest below the axillae.  Phlebostatic axis.sagittal axis an imaginary line extending through the anterior and posterior poles of the eye.visual axis an imaginary line passing from the midpoint of the visual field to the fovea centralis. Axes of the eye. From Dorland's , 2000. op·tic ax·is [TA] the axis of the eye connecting the anterior and posterior poles; it usually diverges from the visual axis by 5° or more. Synonym(s): axis opticus [TA]op·tic ax·is (op'tik ak'sis) [TA] The axis of the eye connecting the anterior and posterior poles; it usually diverges from the visual axis by five degrees or more. FinancialSeeAxisAcronymsSeeoveralloptic axis
Related to optic axis: double refractionSynonyms for optic axisnoun in a doubly refracting crystal, the line in the direction of which no double refraction occursRelated Wordsnoun a line that passes through the center of curvature of a lens so that light is neither reflected nor refractedSynonymsRelated Words |