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Surveillance for Ocular Hypertension: An Evidence Synthesis and Economic Evaluation

Surveillance for Ocular Hypertension: An Evidence Synthesis and Economic Evaluation

Health Technology Assessment - NIHR Journals Library

Version: June 2012

Agreement and reliability of candidate tonometers for measuring intraocular pressure

Raised IOP is the most important risk factor for glaucoma and is the only one that is treatable. The instrument used to measure IOP is called a tonometer. The desirable attributes for a tonometer for use in a monitoring programme are accuracy, precision, acceptability to patients and ease of use. GAT, a contact tonometer, is currently the tonometer most widely used by ophthalmologists and is accepted as the current clinical standard. However, GAT has several limitations (see below for further information), and because of the skills required for its interpretation it is not ideal for the monitoring setting. In this setting, tonometers that do not touch the cornea (non-contact) and the use of which does not require extensive training would be both preferable and more practical. In recent years, a variety of new tonometers for estimating IOP have emerged with potential advantages, including being easy to deliver, non-contact, automated and self-administered, and compensating for, or not being influenced by, corneal thickness and other properties of the cornea.,

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