Applanation tonometers

Patent Pending In applanation tonometry the intraocular pressure is inferred from the force required to flatten (applanate) a constant area of the cornea, for the Imbert-Fick law.[1] The Maklakoff tonometer was an early example of this method, while the Goldmann tonometer is the most widely used version in current practice.[citation needed] Because the probe makes contact with the cornea, a topical anesthetic, such as proxymetacaine, is introduced on to the surface of the eye in the form of an eye drop.