![]() 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 applanation 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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