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(Investigative Ophthalmology and Visual Science. 1971;10:589-591.)
© 1971 by The Association for Research in Vision and Ophthalmology, Inc.

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Theory and Calibration of the Schiøtz Tonometer

III. Friction Between Tonometer Footplate and Cornea

ROBERT A. MOSES 1 and WALTER J. GRODZKI 2

1 Department of Ophthalmology, Washington University School of Medicine, 660 South Euclid, Saint Louis, Mo. 63110
2 Department of Ophthalmology, Washington University School of Medicine 660 South Euclid, Saint Louis, Mo. 63110

Friction between cornea and tonometer footplate restricts formation of the plunger indentation in open manometer calibration studies of the indentation tonometer. Steel plates with burnished Teflon coating lubricated with mineral oil emulsion generated less than one third of the friction of uncoated plates lubricated with saline when drawn across the corneas of enucleated human eyes.

Key Words: cornea • tonometer footplate • maximum plunger indentation • starting and sliding friction

Submitted on March 29, 1971
Accepted on July 15, 1971






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