Final answer:
The normal range of intraocular pressure (IOP) for diagnosing glaucoma is 10-21 mm Hg, with some variations stating 12-24 mm Hg. Tonometers are used for measuring IOP to detect glaucoma, particularly in individuals over 40.
Step-by-step explanation:
The normal range of intraocular pressure (IOP) used to diagnose glaucoma is 10-21 mm Hg. However, it is noted that the normal IOP range may vary slightly, with some sources stating it is between 12-24 mm Hg. When the circulation of fluid in the eye is blocked, it can lead to a condition called glaucoma, where the net pressure can become excessively high. Regular testing of IOP, especially in people over 40 years of age, can help detect and potentially control glaucoma. Measurements of IOP are commonly done using a device called a tonometer, with a noncontact method involving a puff of air to evaluate the eye's response.