![]() Therefore, an updated version of the home/self-use tonometer was developed in the form of Icare HOME released in 2014. 10, 11 However, IcareONE has some demerits in that patients can know their approximate IOP values because the measured IOP values are displayed with an 11-point grading system and patients cannot recognize whether the device is held accurately to measure the IOP upright. 8, 9 A rebound tonometer designed for home/self-use, the IcareONE, was launched in the market, making it possible to determine IOP values outside of office hours. ![]() Measuring the diurnal IOP values using home tonometry or during hospitalization is useful for determining the peak IOP and the degree of IOP fluctuation. Consequently, home tonometry also received attention because normal tension glaucoma cannot be diagnosed using only one or two IOP measurements obtained throughout the day. 5, 6 Additionally, monitoring 24-hour IOP using a contact sensor tonometer 7, 8 became a popular research topic around 2010. Previous studies have implicated peak IOP as a major contributor to glaucoma progression. 4 Icare PRO is easy to use, especially for measuring IOP when children are sleeping in a supine position in the clinic. The new probe ( Figure 2) does not fall out when the tonometer is not upright and has improved accuracy, displaying IOP data outputs to the first decimal place. To overcome this problem, an updated version of the rebound tonometer, Icare PRO, was launched in 2010, with updated features including a built-in inclination sensor that enables IOP measurement in the supine position. 3 However, the disadvantage of Icare TA01i is that the probe can fall out if the tonometer is facing downward. Ophthalmologists and co-medicals treating children with infant or child glaucoma can appreciate the benefits of the rebound tonometer because of the advantages of taking IOP measurements without the need for general anesthesia or sedation. Additionally, this new tonometer does not require an air-puff compared to the conventional noncontact tonometer therefore, it can easily be used for children or animals. The mechanism of this tonometer is superior to that of the Goldmann appla-nation tonometer (GAT), still regarded as the gold standard tonometer in glaucoma management, because there is no need for topical anesthesia and staining fluorescein, slit lamp mounting, and unnecessary infection care due to the use of a disposable probe. 2 The speed of deceleration is measured and converted by the device into IOP. When the ball hits the cornea, the ball and wire decelerate the deceleration is more rapid if the intraocular pressure (IOP) is high and slower if the IOP is low. 2 When the button on the back is pushed, a spring drives the wire and ball forward rapidly. The tonometer contains a tiny 1.8-mm diameter plastic ball on a stainless steel wire held in place by an electromagnetic field in a handheld battery-powered unit. 1 This type of tonometer is still available as Icare ® TA01i (Helsinki, Finland) ( Figure 1) released in 2003. The detailed mechanism of the rebound tonometer was first described in 1997 by Kontiola.
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