Modern tonometry – more than pressure measurement
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Abstract
Goldmann tonometer intraocular pressure measurement was described in 1957, and is still the standard method in use. However, its limitations were the basis of numerous studies aimed to develop a new device whose dependence on factors such as the thickness and other characteristics of the cornea would be kept to a minimum. Currently, different devices are tested that do not only measure the intraocular pressurebut also define other parameters that may be useful in the daily practice of ophthalmology. These include non-contact applanation tonometer (ORA, Ocular Response Analyzer, Reichert), which performs the analysis of the viscoelastic properties of the cornea too. The principle of operation is based on a bidirectional applanation using a single stream of air, which enables assessment of the corneal resistance factor and corneal hysteresis
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References
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