The Applanation Tonometer remains the most widely used instrument to measure interocular pressure. The "Goldmann" method allows IOP measurements to be taken with the patient at the slit lamp as part of a routine examination.
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Ergonomic, easy to read digital display of IOP measurements even in the darkened examination room.
The Perkins has been established for well over 30 years as a "world standard" for hand held applanation tonometers.
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Clement Clarke has developed a low cost disposable prism, which does not compromise the performance of Goldmann Applanation Tonometers.