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May 1964

Tonometer Footplate Weight and Scale Reading: Open Manometer Studies

Author Affiliations

St. Louis
From the Department of Ophthalmology and the Oscar Johnson Institute, Washington University School of Medicine.

Arch Ophthalmol. 1964;71(5):691-692. doi:10.1001/archopht.1964.00970010707017

There is no report in the literature on the relationship of the weight of the Schiotz tonometer footplate to scale reading. That there is a relationship is the subject of this report.

Method  Eye Bank eyes were cannulated through the posterior chamber, the cannula tip then passing into the pupil. The cannula was connected to an open saline reservoir of large capacity. The head of a Mueller electronic tonometer was fixed to one arm of a balance. Variation of footplate weight was accomplished by weighting the pan on the other balance arm (Fig 1). The saline reservoir was set at 40 cm above the limbus. The 7.5 gm plunger load was employed in all experiments. Six eyes were used.

Results  Open manometer scale reading increases with footplate weight at a rate of about 0.3 scale units per gram. The results are summarized in Fig 2.

Comments  Kronfeld1 noted that

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