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  • Ophthalmic tonometers designed to determine intraocular pressure without making contact with the eye, usually by applying a small puff of air against the cornea. These instruments (known as air-puff tonometers) have a mechanism to blow a small puff of air and a measuring instrument with a pressure-sensing membrane that measures the air rebounding from the corneal surface, an electronic processing unit, and a display. Noncontact ophthalmic tonometers are intended mainly for assessing ocular hypertension (intraocular pressure between 10 and 24 mm Hg is considered normal), usually to screen patients for glaucoma.
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