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Self-tonometry: technical aspects of calibration and clinical application


Self-tonometry could be established as an important diagnostic tool in the early diagnosis and follow-up of glaucoma provided that a self-tonometer is precise, safe and easy to use. Furthermore, it has to comply with the legal standards for tonometer calibration. A new software-controlled detection system for the self tonometer permits the evaluation of external factors during the measurement which influence the precision of the tonometric readings. The updated version of the self-tonometer (ST) was compared to the Draeger hand-held applanation tonometer (HAT) in a clinical study with 82 patients (151 eyes). The results show a regression line characterized by a slope of 0.99, an y interception of 1.41, a correlation coefficient of 0.96 and a standard deviation for the ST readings of ±1.78 mmHg. Self-tonometry improves the IOP monitoring as well as patient compliance and therefore is a potential diagnostic tool in the management of glaucoma.

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Groenhoff, S., Draeger, J., Deutsch, C. et al. Self-tonometry: technical aspects of calibration and clinical application. Int Ophthalmol 16, 299–303 (1992). https://doi.org/10.1007/BF00917980

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Key words

  • error detection system
  • optical sensor
  • self-tonometer
  • self-tonometry