chromatic aberration

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1. deviation from the normal or usual.
2. imperfect refraction or focalization of a lens.
chromatic aberration unequal refraction by a lens of light rays of different lengths passing through it, producing a blurred image and a display of colors.
dioptric aberration (spherical aberration) inability of a spherical lens to bring all rays of light to a single focus.
ventricular aberration aberrant ventricular conduction.

chro·mat·ic ab·er·ra·tion

the difference in focus or magnification of an image arising because of a difference in the refraction of different wavelengths composing white light.

chromatic aberration

Optics The differences in the focal points when multiple wave lengths–colors of light–eg, those of white light, pass through a lens system

chro·mat·ic ab·er·ra·tion

(krō-mat'ik ab-ĕr-ā'shŭn)
The difference in focus or magnification of an image arising because of a difference in the refraction of different wavelengths composing white light.
Synonym(s): chromatism (2) .

chromatic aberration

Colour fringes around the edge of the image cast by a lens.


Sir Isaac, English physicist, 1642-1727.
newton - derived unit of force in the SI system.
Newton disk - a disk on which there are seven colored sectors, which, when rapidly rotated, appear white.
Newton law - the attractive force between any two bodies is proportional to the product of their masses and inversely proportional to the square of the distance between their centers. Synonym(s): law of gravitation
Newton rings - colored rings on thin surfaces.
newtonian aberration - the difference in focus or magnification of an image arising because of a difference in the refraction of different wavelengths composing white light. Synonym(s): chromatic aberration
newtonian constant of gravitation - a universal constant relating the gravitational force, attracting two masses toward each other when they are separated by a distance.
newtonian flow - the type of flow characteristic of a newtonian fluid.
newtonian fluid - a fluid in which flow and rate of shear are always proportional to the applied stress.
newtonian viscosity - the viscosity characteristics of a newtonian fluid.


1. Process by which a sensory organ (e.g. the eye) adjusts to its environment (e.g. to luminance, colour or contact lens wear).
2. The reduction in sensitivity to continuous sensory stimulation. The neurophysiological correlate corresponds to a decrease in the frequency of action potentials fired by a neuron, despite a stimulus of constant magnitude. Visual adaptation is prevented from occurring by the continuous involuntary movements of the eyes. See fixation movements; action potential; stabilized retinal image.
chromatic adaptation Apparent changes in hue and saturation after prolonged exposure to a field of a specific colour.
dark adaptation Adjustment of the eye (particularly regeneration of visual pigments and dilatation of the pupil), such that, after observation in the dark, the sensitivity to light is greatly increased, i.e. the threshold response to light is decreased. This is a much slower process than light adaptation. Older people usually take longer to adapt to darkness and only reach a higher threshold than young people. See adaptometer; hemeralopia; visual pigment; duplicity theory.
light adaptation Adjustment of the eye (particularly bleaching of visual pigments and constriction of the pupil), such that, after observation of a bright field, the sensitivity to light is diminished, i.e. the threshold of luminance is increased. See duplicity theory.
prism adaptation See vergence adaptation.
sensory adaptation Mechanism by which the visual system adjusts to avoid confusion and diplopia of the perceptual impression due to an abnormal motor condition (e.g. strabismus).
vergence adaptation A process by which the eyes return to their condition of habitual heterophoria or orthophoria after a heterophoria has been induced by prisms (prism adaptation) in front of one or both eyes (as, for example, when lens centration does not coincide with the interpupillary distance), or by spherical lenses, or due to changes in the orbital contents with increasing age. This adaptation process may be related to the phenomenon of orthophorization. People who have symptomatic binocular vision anomalies do not, or only partially, show vergence adaptation to prisms. Vergence adaptation decreases with increasing age.


Phenomenon of the change in velocity of propagation of radiation in a medium, as a function of its frequency, which causes a separation of the monochromatic components of a complex radiation. All optical media cause dispersion by virtue of their variation of refractive index with wavelengths. Dispersion is specified by the difference in the refractive index of the medium for two wavelengths. The difference between the blue F (486.1 nm) and the red C (656.3 nm) spectral lines is called the mean dispersion, i.e. nFnC. Dispersion is usually represented by its dispersive power ω or relative dispersion which is equal to the mean dispersion divided by the excess refractive index of the helium d (587.6 nm) spectral line (nd − 1), often called the refractivity of the material,
ω = nFnC/nd − 1
The reciprocal of the dispersive power is called the Abbé's number or constringence (Fig. D8). See aberration longitudinal chromatic; achromatic axis; Fraunhoffer's lines; achromatic prism.
Fig. D8 Dispersion of a white beam of light by a prismenlarge picture
Fig. D8 Dispersion of a white beam of light by a prism


Apparent displacement of an object viewed from two different points not on a straight line with the object.
binocular parallax The difference in angle subtended at each eye by an object that is viewed first with one eye and then with the other.
chromatic parallax Apparent lateral displacement of two monochromatic sources (e.g. a blue object and a red object) when observed through a disc with a pinhole placed near the edge of the pupil. When the pupil is centred on the achromatic axis (in some people the pinhole may have to be placed away from the centre of the pupil), the two images appear superimposed. The relative displacement of the two images becomes reversed when the pinhole is on the other side of that axis. This phenomenon is attributed to the chromatic aberration of the eye. See chromostereopsis; longitudinal chromatic aberration.
monocular parallax The apparent change in the relative position of an object when the eye is moved from one position to another.
motion parallax Apparent difference in the direction of movement or speed produced when the subject moves relative to his environment (Fig. P2). Example: when viewing the landscape through the window of a moving train near objects appear to move much more quickly than distant objects. See depth perception; stereopsis.
relative binocular parallax See stereoscopic visual acuity.
Fig. P2 An example of motion parallaxenlarge picture
Fig. P2 An example of motion parallax
References in periodicals archive ?
Chromatic aberration isn't a distortion specific to the 1920s--it can happen even today with digital cameras when the lens fails to focus all colors to the same convergence point.
In each iteration the chromatic aberration is made to match better the monochromatic aberration value.
Achromatic lenses are usually found as holographic or phase design technologies to reduce the effects of chromatic aberrations on final quality [5, 6].
The Mangin corrects for the chromatic aberration of the single-element objective.
It also filters short wavelength light to reduce chromatic aberration and light scatter, thereby enhancing visual performance in terms of contrast discrimination and photostress recovery in both normal and AMD patients.
A zoom eyepiece, providing about ~430x-1050x magnification, was used in conjunction with a yellow-orange Wratten 15 filter during his observation--the latter was standard procedure to minimise any chromatic aberration effects in the two-element achromatic refractor.
dispersion (UD) lens elements, which are aimed at minimising chromatic aberration
The reverse Galilean optical finder with a 0.5Eu magnification features all-glass elements made from high-refractive index glass and demonstrates low chromatic aberration and distortion.
extra low dispersion fluorite glass, which enhances color resolution and contrast, and eliminates chromatic aberration and color-fringing.
Due to their random, non-periodic nature, based on the recording of speckle patterns (a patented approach), they are not wavelength dependent and do not produce chromatic aberration or moire effects.
It also has a high Abbe number and low chromatic aberration and bireftingence.