The only modifiable risk factor for glaucoma is intraocular pressure (IOP), despite the fact that many factors are known to contribute to its onset and progression. IOP reduction is a goal of both medical and surgical glaucoma treatments in order to slow the disease's progression. Therefore, tonometry is a crucial component of the ophthalmological examination. Tonometers come in a variety of varieties at the moment. These include both new devices created as a result of recent technological advancements and well-established instruments that have been in clinical use for many years. The benefits and drawbacks of the various instruments determine whether they are appropriate for a particular setting, objective, and patient population. We describe the most popular tonometers currently on the market in this review, along with their benefits, drawbacks, and practicality.