Abstract
The significance of intraocular pressure (IOP) was first noted in the 10th century. Instrumentation to measure IOP was first developed in the 19th century and has continued to develop over time. We now have anesthetics to aid in measuring intraocular pressure by indentation, applanation, or a combination of both indentation and applanation. In addition, non-contact and rebound tonometers are available and require no anesthetic. This article discusses the development, design and use of these instruments over a historical timeline.
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