defocus

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defocus

(de-fo'kus) [L. de, away from, + focus, hearth]
The blurring of a visual image caused by spherical aberration, chromatic aberration, or diffraction. Also called optical defocus. Synonym: optical defocus

optical defocus

Defocus.

defocus

To put or go out of focus.
hyperopic defocus State of the eye in which the retinal image is focused behind the retina. It may occur when placing a negative lens in front of an emmetropic presbyopic eye; in an uncorrected presbyopic hyperope; in a high hyperope unable to overcome the ametropia by accommodating; or as an accommodative lag in an uncorrected or corrected myope, as well as in an emmetrope viewing a near object. See lag of accommodation; over-correction.
myopic defocus State of the eye in which the retinal image is focused in front of the retina. It may occur when placing a positive lens in front of an emmetropic eye; in an uncorrected or undercorrected myopic eye; or if there is a lead of accommodation, as is the case in some individuals viewing a distant object. See lead of accommodation; under-correction.
References in periodicals archive ?
Options traditionally used by big-screen TV manufacturers are significantly more expensive, or use low quality alternatives such as defocusing the lens or simply doubling the lines, which reduces the quality or vertical resolution.
Former Deputy PM Ivica Bocevski is convinced that the latest developments do not hide a scenario that is aimed at organizing early election or defocusing the public.
Therefore, she advises the Government to stop defocusing the public with the populist politics.
The program uses a simple, elegant and yet powerful variation of the common unsharp mask, where the procedure is to defocus and subtract one image of a stereo pair from the other, rather than defocusing and subtracting an image from itself.
Jerry Peterson, executive vice president and general manager of 3Dlabs Wildcat division, commented, "The BBC R&D department is continuously working on innovative technology, which has resulted in products such as retro-reflective background cloth, depth-of-field defocusing and advanced camera position measurement.
Experts said that the tensions between the partners are a front for the country's foreign policy failures and the failures in the economy and that the formula for defocusing the attention is already known.
And while this defocusing of the public carries on, the army budget has reached the bottom a long time ago and there is no excuse that other countries in the world, due to the crisis, made a cut in the budgets.
A decrease in the electrical output signal of a small silicon solar cell, placed in the center of the second laser beam, quantifies that beam's defocusing.
According to SDSM, marriage is now defined as a community only of a man and a woman and accused that this initiative is only aimed at defocusing the public.
Special algorithms allow defocusing capability in flat field correction and white balancing without the need of adjusting the optical lens.
He said that BDI's travels are aimed at defocusing the public.
However, this is another defocusing from the proposal of UN mediator Matthew Nimetz that has been tabled a long time ago and which could have been discussed about by the two prime minister if they really wanted to.