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The instrument used to measure intraocular pressure is a tonometer. A tonometer is specifically designed to gauge the pressure within the eye (intraocular pressure), which is an essential aspect of diagnosing and managing conditions such as glaucoma. This is done through various methods, which may include applanation tonometry or non-contact tonometry.

Though tonometry refers to the method or process of measuring eye pressure, the term "tonometer" specifically signifies the device employed to carry out this function. It is crucial for eye care professionals to have accurate readings from a tonometer to assess the health of the eye effectively and to intervene if elevated pressure is detected.

In comparison, a perimeter is used for visual field testing, and an ophthalmoscope is used for examining the interior structures of the eye. Neither of these tools measures intraocular pressure. Therefore, recognizing the specific function of a tonometer clarifies its role in eye examinations.