Which instrument is used to measure intraocular pressure?

The tonometer is specifically designed to measure intraocular pressure, which is critical in the diagnosis and management of various eye conditions, such as glaucoma. This instrument works by applying a small force to the eye and measuring how much the eye surface deforms. The readings obtained provide valuable information about the pressure inside the eye, which must be monitored to prevent damage to the optic nerve and ensure overall eye health.

Visometers are used to measure the refractive index of lenses and help determine the proper prescription for eyeglasses, but they do not assess intraocular pressure. Sphygmomanometers measure blood pressure, primarily in the arteries, making them unrelated to eye pressure measurement. Retinoscopes are utilized to assess the refractive state of the eye by shining light into the pupil and observing the reflection off the retina, but they also do not provide information about intraocular pressure. Hence, the tonometer is the appropriate choice for measuring intraocular pressure.