Abstract
ABSTRACTIntraocular pressure (IOP) remains the only modifiable risk factor in the management of glaucoma. Hence, IOP and its appropriate measurement deserve our ongoing interest. Over the years, not only has our understanding of glaucoma changed but also has changed our approach to the measurement of the IOP. This review is an attempt to elucidate the commonly techniques of tonometry, and critically evaluate each of them, in current glaucoma practice.How to cite this article: Maheshwari R, Choudhari NS, Singh MD. Tonometry and Care of Tonometers. J Current Glau Prac 2012;6(3):124-130.
Highlights
Definition of glaucoma has changed over the decades from a simple ocular pressure-related disease to a systemic disorder of multivariate etiology
A pneumatic system generates a puff of air which is directed against the cornea and a detector device estimates the intraocular pressure (IOP) based on reflections from flattened cornea
Comparisons against Goldmann applanation tonometers indicate that the Noncontact tonometer (NCT) is reliable within the normal IOP range, the reliability is reduced in the higher pressure ranges and is limited by an abnormal cornea or poor fixation.[5-7]
Summary
Definition of glaucoma has changed over the decades from a simple ocular pressure-related disease to a systemic disorder of multivariate etiology. Intraocular pressure (IOP) remains the only modifiable risk factor in the management of glaucoma. IOP and its appropriate measurement deserve our ongoing interest. Has our understanding of glaucoma changed and has changed our approach to the measurement of the IOP. Tonometry has been over 180 year’s long journey.[1] In early 19th century, Sir William Bowman at British medical association addressed the critical role of digital estimation of ocular tension. In late 19th century, Donders designed the first instrument which displaced intraocular fluid by contact with the sclera. The first commonly used mechanical tonometer designed by H Schiotz in early 1900s soon became the new gold standard
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