n :  a tonometer used to measure intraocular pressure in millimeters of mercury
 
Schiötz, Hjalmar (1850-1927), Norwegian physician. With the French ophthalmologist Louis-Emile Javal (1839-1907), Schiötz invented a tonometer for measuring intraocular pressure. They introduced their tonometer in an article published in 1881.
 
   
 
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