Determining the intraocular pressure (IOP) is a part of routine ophthalmic examination. Elevated IOP is a risk factor for glaucoma, and reducing the IOP is the only way to halt or dampen glaucoma progression. Therefore, precise measurement of IOP is critical in glaucoma management. Tonometry is the procedure of determining IOP using various techniques. Various devices are available in the market for determining IOP. Each one works with different principles. Different methods have been introduced and some of them in development, but there is still no perfect clinical method for exact measurement of IOP. This chapter aims to explore various tonometry devices available in the market while explaining their working principles, features, advantages, and disadvantages. Clinicians must choose proper technique balancing the accuracy, convenience, and cost of the tonometers. Estimation values of tonometers should be used with clinical aspects of patients.
Part of the book: Glaucoma