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  • Title: Comparison of intraocular pressure measurements with the Oculab Tono-Pen vs manometry in humans shortly after death.
    Author: Hessemer V, Rössler R, Jacobi KW.
    Journal: Am J Ophthalmol; 1988 Jun 15; 105(6):678-82. PubMed ID: 3377044.
    Abstract:
    We compared the Oculab Tono-Pen, a miniaturized Mackay-Marg tonometer, with a Statham membrane manometer in six humans (12 eyes), three to six hours after death. The intraocular pressure was changed in 5- to 10-mm Hg steps in a range between 0 and 60 mm Hg by an infusion system. The correlation coefficient of the relation of Tono-Pen readings vs manometrically determined intraocular pressures was .99. Compared to the manometer, the Tono-Pen gave a small underestimation of intraocular pressure above 17 mm Hg or overestimation below 17 mm Hg. The maximal deviation of the Tono-Pen readings from the manometer readings was 2.5 mm Hg. In our experience the correspondence between Tono-Pen and manometer readings was superior to the correspondence between the readings obtained with the original Mackay-Marg tonometer and manometry.
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