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April 1957

Tonometer CalibrationDetermination of Pt Formula by Use of Strain Gauge and Recording Potentiometer on Enucleated Normal Human Eyes

Author Affiliations

San Rafael, Calif.
Division of Ophthalmology, Stanford University School of Medicine, San Francisco.

AMA Arch Ophthalmol. 1957;57(4):520-531. doi:10.1001/archopht.1957.00930050532005

I. Introduction  The Committee on Standardization of Tonometers of the American Academy of Ophthalmology and Otolaryngology has performed a valuable service in arranging for manufacturers to produce tonometers which are uniform in their various weights and measurements and which give consistent readings. These certified instruments have made possible the comparison of readings taken with different tonometers by different persons in different parts of the country. Thus, a scale reading of 3.0 with the 5.5 gm. weight on a Schiøtz certified tonometer taken by Dr. Smith in New York on a given patient is equivalent to the same reading taken on another certified tonometer by Dr. Brown in Chicago on the same patient.Accurate calibration of tonometers is important for a number of reasons. Since the Schiøtz tonometer uses several weights, it should be possible to detect variations in ocular rigidity clinically and to compensate for them. Tonography depends very definitely

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