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Prism correction is measured in prism dioptres. A prescription that specifies prism correction will also specify the "base". The base is the thickest part of the lens and is opposite from the apex. Light will be bent towards the base and the image will be shifted towards the apex. In an eyeglass prescription, the base is typically specified as up, down, in, or out, but left and right are also ...
Diplopia is the simultaneous perception of two images of a single object that may be displaced horizontally or vertically in relation to each other. [1] Also called double vision, it is a loss of visual focus under regular conditions, and is often voluntary. However, when occurring involuntarily, it results from impaired function of the extraocular muscles, where both eyes are still functional ...
Chirped pulse amplification ( CPA) is a technique for amplifying an ultrashort laser pulse up to the petawatt level, with the laser pulse being stretched out temporally and spectrally, then amplified, and then compressed again. [1] The stretching and compression uses devices that ensure that the different color components of the pulse travel different distances.
A laser pointer or laser pen is a (typically battery-powered) handheld device that uses a laser diode to emit a narrow low-power visible laser beam (i.e. coherent light) to highlight something of interest with a small bright colored spot.
By accusing the heads of Israel and Hamas of war crimes, the International Criminal Court’s top prosecutor placed them among world leaders infamous for heinous acts against humanity. The chief ...
NEW YORK (Reuters) - Shares of U.S. health insurers fell on Wednesday after UnitedHealth Group's chief executive said the company was keeping an eye on medical services used by Medicaid members ...
In ophthalmology, horror fusionis is a condition in which the eyes have an unsteady deviation, with the extraocular muscles performing spasm-like movements that continuously shift the eyes away from the position in which they would be directed to the same point in space, giving rise to diplopia. Even when the double vision images are made to nearly overlap using optical means such as prisms ...
A corrective lens is a transmissive optical device that is worn on the eye to improve visual perception. The most common use is to treat refractive errors: myopia, hypermetropia, astigmatism, and presbyopia. Glasses or "spectacles" are worn on the face a short distance in front of the eye. Contact lenses are worn directly on the surface of the eye. Intraocular lenses are surgically implanted ...
George Michael was the only artist to achieve two year-end Billboard Hot 100 number-one singles in the 1980s. He achieved this with his songs "Faith" and "Careless Whisper". He is one of two recording acts to achieve more than one year-end Billboard Hot 100 number-one single in the history of the chart, with the other being The Beatles, who also had two year-end number-ones.
The United States Penitentiary, Marion ( USP Marion) is a large medium-security United States federal prison for male and female inmates in Southern Precinct, [1] unincorporated Williamson County, Illinois. [2] [3] It is operated by the Federal Bureau of Prisons, a division of the United States Department of Justice. The facility also has an adjacent satellite prison camp that houses minimum ...