A new hand-held tonometer, Tono-Pen (TP), was compared with the Goldmann tonometer (GM). The TP utilizes the operating principle of the Mackay-Marg tonometer. However, the TP is battery-operated, only 18 cm long, weighs only 60 g, and features electronic signal analysis (single-chip microprocessor) and a digital pressure display (mm Hg). In 108 subjects… (More)
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