Myopic patients seem to be at a somewhat greater risk of developing glaucoma, thus warranting a particularly careful screening. Many of these individuals are undergoing the surgical modification of their corneas via LASIK and other techniques. Unfortunately, these procedures render accurate IOP measurement by standard methods ie, applanation tonometry difficult or impossible. Ophthalmologists are creating a pool of patients in whom a timely suspicion of glaucoma may be jeopardized by thinned or otherwise surgically altered corneas. This article describes how a new technology may assist practitioners in accurately evaluating patients' IOPs. The majority of tonometer designs proposed to date both the contact and the noncontact type are based on a common principle: a force is applied to the cornea to achieve a defined amount of distortion indentation or applanation of the cornea.
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Interindividual variability of central corneal thickness has been found to be a source of error for conventional Goldmann applanation tonometry. The dynamic contour tonometer represents a potentially new technology for non-invasive and direct intraocular pressure IOP measurement, and has been proposed to accurately measure the true IOP irrespective of the corneal thickness.
It is based on the principle that when the tip of the device exactly matches the contour of the cornea, the pressure measured by a transducer placed on its tip is an accurate indicator of the true IOP. This device is also capable of measuring the ocular pulse amplitude, a variable that has controversial significance in the diagnosis and management of glaucoma.
Even though this technique seems to be very promising, further studies are required to conclusively determine the effectiveness of the dynamic contour tonometer in patients having an abnormal or irregular corneal contour.
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Similar articles [How does central cornea thickness influence intraocular pressure during applanation and contour tonometry? Schwenteck T, et al. Klin Monbl Augenheilkd.
Epub Sep PMID: German. Ocular pulse amplitude measurement using pascal dynamic contour tonometer in glaucoma patients. Katsimpris JM, et al. Epub Apr PMID: From indentation and applanation to contour adaptation]. Kanngiesser H, Kniestedt C. Kanngiesser H, et al. PMID: Review. New ways to measure intraocular pressure.
ElMallah MK, et al. Curr Opin Ophthalmol. Show more similar articles See all similar articles. Cited by 13 articles Tonometers-which one should I use? Aziz K, Friedman DS. Aziz K, et al. Eye Lond. Epub Feb Ocular pulse amplitude in different types of glaucoma using dynamic contour tonometry: Diagnosis and follow-up of glaucoma. Cheng L, et al. Exp Ther Med. Epub Aug Evaluation of ocular pulse amplitude in non-arteritic anterior ischaemic optic neuropathy. Acan D, et al. BMC Ophthalmol.
Cetin EN, et al. Evaluation of Goldmann applanation tonometry, rebound tonometry and dynamic contour tonometry in keratoconus. J Optom. Epub Jul 9. Show more "Cited by" articles See all "Cited by" articles. Publication types Review Actions. Humans Actions. Full-text links [x] Wiley. Copy Download.
Dynamic Contour Tonometry: Principle and Use
Claude Kaufmann, Lucas M. Bachmann, Michael A. The dynamic contour tonometer DCT; Pascal tonometer is a novel tonometer designed to measure intraocular pressure IOP independent of corneal properties. The purpose of this study was a comparison of the DCT with the Goldmann applanation tonometer GAT with respect to mean of IOP readings, the influence of ocular structural factors on IOP readings, and both intra- and interobserver variability, in a large group of healthy subjects. To evaluate intra- and interobserver variability, IOP was measured in eight eyes by four observers. In contrast to GAT, multivariable regression analysis showed no significant effect of corneal thickness, corneal curvature, astigmatism, anterior chamber depth, and axial length on DCT readings.
Dynamic Contour Tonometry
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