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Computer vision syndrome. Computer vision syndrome ( CVS) is a condition resulting from focusing the eyes on a computer or other display device for protracted, uninterrupted periods of time and the eye's muscles being unable to recover from the constant tension required to maintain focus on a close object.
Bookless libraries are public, academic and school libraries that do not have any printed books. Instead they offer all-digital collections of literary works, reading material and scientific and academic research material. A bookless library typically uses the space that would have once been used for books to offer public computers, e-readers ...
The Baen Free Library is a digital library of the science fiction and fantasy publishing house Baen Books where 61 e-books as of June 2016 (112 e-books as of December 2008) can be downloaded free in a number of formats, without copy protection. [ 1] It was founded in late 1999 by science fiction writer Eric Flint and publisher Jim Baen to ...
The P-61 radar operator occupied a separate compartment in the rear of the fuselage accessed from a hatch below. In August 1940, sixteen months before the United States entered the war, the U.S. Air Officer in London, Lieutenant General Delos C. Emmons, was briefed on British research in radar ("Radio Detection And Ranging" as it was then known), which had been underway since 1935, and had ...
The Bates method is an ineffective and potentially dangerous alternative therapy aimed at improving eyesight. Eye-care physician William Horatio Bates (1860–1931) held the erroneous belief that the extraocular muscles effected changes in focus and that "mental strain" caused abnormal action of these muscles; hence he believed that relieving ...
Palep herself was quite concerned with the dosage of the light therapy provided by the masks, as not every patient may require the same amount and duration of the treatment. "The potential dangers ...
The idea behind ray casting, the predecessor to recursive ray tracing, is to trace rays from the eye, one per pixel, and find the closest object blocking the path of that ray. Think of an image as a screen-door, with each square in the screen being a pixel. This is then the object the eye sees through that pixel.
In the 30 years from 1993 to 2023, the S&P 500 ( ^GSPC) had a compound annual growth rate (CAGR) of 7.8%. Reinvesting dividends would have boosted that return to 9.9%, according to Yahoo Finance ...