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The tonometer tip rests on the cornea with a constant appositional force of one gram. When the sensor is subjected to a change in pressure, the electrical resistance is altered and the tonometer's computer calculates a change in pressure according to the change in resistance. A complete measurement cycle requires about eight seconds of contact ...
Armand Imbert (1850-1922) and Adolf Fick (1829-1901) both demonstrated, independently of each other, that in ocular tonometry the tension of the wall can be neutralized when the application of the tonometer produces a flat surface instead of a convex one, and the reading of the tonometer (P) then equals (T) the IOP," whence all forces cancel each other.
The Douglas AC-47 ("Puff, the Magic Dragon") was the first in a series of fixed-wing gunships developed by the United States Air Force during the Vietnam War.It was designed to provide more firepower than light and medium ground-attack aircraft in certain situations when ground forces called for close air support.
Goldmann applanation tonometer is based on the Imbert–Fick principle, which states that for a dry thin-walled sphere, the pressure (P) inside the sphere equals the force (F) necessary to flatten its surface divided by the area (A) of flattening (i.e. P = F/A).
Trump said he is not considering military force to annex Canada ‒ whose longtime prime minister, Justin Trudeau resigned Monday ‒ but said he hopes the U.S. can acquire the neighboring country ...
Ohio State is one win away from a college football national championship after beating Texas in the Cotton Bowl with two fourth-quarter touchdowns.
The ad cost $14 million to air in the first half, according to tech publication The Verge. "It's understandable given that, with the amount of money invested in the spot, the audience really was ...
A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.