What instrument is used to measure intraocular pressure?

The tonometer is the correct instrument used to measure intraocular pressure (IOP). This measurement is essential in the diagnosis and management of glaucoma and other ocular conditions. A tonometer assesses the pressure inside the eye by measuring the resistance of the cornea to indentation or by bouncing a small amount of pressure onto the surface of the eye.

Tonometers come in various types, including air puff tonometers, which measure the pressure using a brief air jet, and applanation tonometers, which require direct contact with the cornea but provide precise readings. Accurate measurement of IOP is critical for monitoring the health of the eye and preventing potential vision impairment associated with elevated intraocular pressure.

The other instruments mentioned serve different purposes: the sphygmomanometer measures blood pressure, the ophthalmoscope is used for viewing the interior of the eye, and the retinoscope is utilized for assessing refractive errors. Understanding the specific functions of these tools helps in providing comprehensive eye care.