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The Ocular Response Analyzer and Pascal DCT Tonometers are less affected by CCT than the Goldmann tonometer. Conversely, non-contact and rebound tonometers are more affected. [23] [24] [25] Corneal thickness varies among individuals as well as with age and race. It is reduced in certain disease and following LASIK surgery.
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.
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A phoropter made by Reichert. Phoroptor is a registered trademark currently owned by Reichert Technologies, filed April 25, 1921, by DeZeng Standard of New Jersey, with the USPTO, serial number 71146698. The word was coined at that time for the newest version of their phoro-optometer.
Hermann Reichert was born in Pernitz, Austria, on 7 April 1944.He received his PhD in Germanic philology at the University of Vienna in 1971. His dissertation was supervised by Otto Höfler.
The Schiotz tonometer consists of a curved footplate which is placed on the cornea of a supine patient. A weighted plunger attached to the footplate sinks into the cornea. A scale then gives a reading depending on how much the plunger sinks into the cornea, and a conversion table converts the scale reading into IOP measured in mmHg.