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Thinkorswim, Inc. was founded in 1999 by Tom Sosnoff and Scott Sheridan as an online brokerage specializing in options. [2] It was funded by Technology Crossover Ventures. [3] In February 2007, Investools acquired Thinkorswim. [4] In January 2009, it was acquired by TD Ameritrade in a cash and stock deal valued around $606 million.
The apparent PPI of a monitor depends upon the screen resolution (that is, the number of pixels) and the size of the screen in use; a monitor in 800×600 mode has a lower PPI than does the same monitor in a 1024×768 or 1280×960 mode. The dot pitch of a computer display determines the absolute limit of possible pixel density.
This also means one UXGA 20-inch monitor in portrait orientation can also be flanked by two 30-inch WQXGA monitors for a 6320 × 1600 composite image with an 11.85:3 (79:20, 3.95:1) aspect ratio. An early consumer WQXGA monitor was the 30-inch Apple Cinema Display, unveiled by Apple in June 2004.
60 fps typically, some gaming monitors can do up to 540 fps; internally, display refreshed at up to 540 fps [18] [19] 60 fps typically, some can do 120 fps; internally, display refreshed at e.g. 480 or 600 fps [20] 60 fps typically. Up to 480 fps. [21] Flicker: Perceptible on lower refresh rates (60 fps and below) [22]
[2] Therefore, if one is interested in the performance of the eye or the first processing steps in the visual cortex, it does not make sense to refer to the absolute size of a viewed object (its linear size ). What matters is the visual angle which determines the size of the retinal image.
Near visual acuity or near vision is a measure of how clearly a person can see nearby small objects or letters.Visual acuity in general usually refers clarity of distance vision, and is measured using eye charts like Snellen chart, LogMAR chart etc. Near vision is usually measured and recorded using a printed hand-held card containing different sized paragraphs, words, letters or symbols.
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Javal discovered that while reading, one's eyes tend to jump across the text in saccades, and stop intermittently along each line in fixations. [ 1 ] Because of the lack of technology at the time, naked-eye observations were used to observe eye movement , until later in the late 19th and mid-20th century eye-tracking experiments were conducted ...