How is intraocular pressure measured and what is considered a normal range according to the chapter on eye disorders?

Intraocular pressure (IOP) is measured using a tonometer, which can be a handheld device or a more complex instrument like an applanation tonometer. The normal range for intraocular pressure is considered to be between 10 and 21 mm Hg.

A tonometer is used to measure intraocular pressure, which is important for diagnosing conditions such as glaucoma. The measurement can be taken using various types of tonometers, including handheld devices and applanation tonometers, which flatten the cornea to assess pressure. A normal intraocular pressure reading falls within the range of 10 to 21 mm Hg.