Comparison of intraocular pressure measurements with the Oculab Tono-Pen vs manometry in humans shortly after death.
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.
Hessemer
V
V
University Eye Clinic, Justus Liebig University, Giessen, West Germany.
Rössler
R
R
Jacobi
K W
KW
D000368:Aged; D005069:Evaluation Studies as Topic; D006801:Humans; D007429:Intraocular Pressure; D008365:Manometry / Q000592:standards*; D008875:Middle Aged; D012044:Regression Analysis; D014065:Tonometry, Ocular / Q000295:instrumentation* / Q000592:standards