Tonometry in optometric practice

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The use of tonometry for the measurement of intraocular pressure (IOP) occupies a key position among those tests that optometrists routinely carry out in practice. Over the past 25 years elevated IOP has shifted from being an essential part of the de nition of POAG to its current position where elevated IOP no longer features in modern de nitions of the disease, re ecting the high proportion of those with POAG who su er from normal tension glaucoma. Instead, elevated IOP is now regarded a major glaucoma risk factor. Accurate tonometry is the only means at our disposal to detect the important glaucoma risk factor of elevated IOP, and the only way to assess if treatment for POAG has reduced IOP sufficiently to halt the progress of the disease.

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