Comparison of the Tono-Pen to the Goldmann Applanation Tonometer

doi:10.1001/archopht.1988.01060130820030

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Vol. 106 No. 6, June 1988

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Comparison of the Tono-Pen to the Goldmann Applanation Tonometer

Ronald E. P. Frenkel, MD; Young J. Hong, MD; Dong H. Shin, MD, PhD

Arch Ophthalmol. 1988;106(6):750-753.

Abstract

• Oculab Tono-Pen tonometry was compared with Goldmannapplanation tonometry in 142 eyes of 71 patients without cornealproblems. Overall we found 63% of the Tono-Pen readings to bewithin ±2 mm Hg of the Goldmann applanation tonometryreadings and 77% to be within ±3 mm Hg, while 4% werewithin at least ±7 mm Hg difference. The correlationcoefficient between the readings of the two instruments was.84.The mean value of the paired differences was 0.81 ± 3.09mm Hg overall, –1.78 ± 1.86 mm Hg in the 4 to 10mm Hg interval, 0.07 ± 2.97 mm Hg in the 11 to 20 mmHg interval, 1.27 ± 2.62 mm Hg in the 21 to 30 mm Hginterval, and 4.15 ± 2.28 mm Hg in the 31 to 45 mm Hginterval. We conclude that the Tono-Pen measures intraocularpressure in a manner that corresponds well to the Goldmann tonometerin the 11 to 20 mm Hg interval, and fairly well in the 4 to10 mm Hg and 21 to 30 mm Hg intervals. It lacks good correspondencein the 31 to 45 mm Hg interval.

Author Affiliations

From the Kresge Eye Institute, Wayne State University School of Medicine, Detroit. Dr Frenkel is now with the Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston.

Footnotes

Accepted for publication Dec 25, 1987.

Reprint requests to the Kresge Eye Institute, 3994 John R, Detroit,MI 48201 (Dr Shin).

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