Measurements of intraocular pressure using various tonometers reveal slight discrepancies in readings, suggesting caution in longitudinal assessments.
Intraocular pressure measurements were made on 30 normal eyes using seven noncontact tonometers. The instruments were from 4 to 8 years old. Results show that pressures indicated by most noncontact tonometers are not significantly different. In the most extreme case, differences in mean pressures of 3.48 mm Hg were obtained. A difference of this magnitude may be important when following a patient over a period of time, and could be the result of measurements being made on a different tonometer.
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Augsburger et al. (1982) studied this question.
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