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Dynamische Konturtonometrie

Dynamic contour tonometry

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Zusammenfassung

Die dynamische Konturtonometrie (DCT) ist ein neues Verfahren zur nichtinvasiven und direkten Messung des intraokularen Drucks (IOD), das durch strukturelle Eigenschaften des Auges weniger beeinflusst werden soll. Der IOD wird transkorneal mit einem externen Sensor erfasst. Die Kontur des Tonometerkopfs ist konkav gewölbt und nur leicht flacher als die menschliche Hornhaut. Die Hornhautkontur passt sich der des Druckköpfchens an, und der Sensor im Zentrum des Konturanpassareals misst den Druck auf der anderen Seite der Hornhaut im kräftefreien Bereich. Die DCT scheint laut bisher veröffentlichen Studien im Vergleich zur Applanationstonometrie weniger von den biomechanischen Eigenschaften der Hornhaut abhängig zu sein. Zusätzlicher Vorteil gegenüber allen anderen Tonometern ist die dynamische Messung über eine gewisse Zeitperiode. Mit der DCT ist es möglich, den diastolischen und den systolischen IOD zu messen und dessen Differenz, die okulare Pulsamplitude, zu bestimmen. Diese ist ein indirekter Hinweis für die choroidale Perfusion und lässt Rückschlüsse auf den Zustand des arteriellen Gefäßsystems und der Herzaktion zu. Sie könnte in der Diagnose und Therapie des Glaukoms eine wichtige Rolle spielen.

Abstract

Dynamic contour tonometry (DCT) is a new technology for noninvasive and direct measurement of intraocular pressure (IOP); its results are thought to be influenced less than those of other methods by structural characteristics of the eye. The curvature of the pressure sensing device is concave and only slightly flatter than that of the human cornea. The cornea adapts to the curvature of the transducer head, and the sensor in the centre of the adapted area measures the pressure on the other side of the cornea in the force-free range. Studies published so far suggest that DCT is less heavily dependent than applanation tonometry on the biomechanical properties of the cornea . A further advantage of DCT over other forms of tonometry is the capability of dynamic measurements over time. It is also possible to measure both the diastolic and the systolic IOD and determine the difference between the two, i.e. the ocular pulse amplitude (OPA). OPA is an indirect indicator of choroidal perfusion and reflects the condition of the arterial vascular system and the action of the heart. It could be important in the diagnosis and treatment of glaucoma.

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Interessenkonflikt

Der korrespondierende Autor weist auf eine Verbindung mit folgender Firma/Firmen hin: Dr. H. Kanngiesser ist Angestellter der Firma SMT AG.

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Authors and Affiliations

  1. Augenklinik, Kantonsspital, Brauerstraße 15, 8400 , Winterthur, Schweiz

    C. Kniestedt

  2. Swiss Microtechnology AG, Port, Schweiz

    H. E. Kanngiesser

Authors
  1. C. Kniestedt
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  2. H. E. Kanngiesser
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Correspondence to C. Kniestedt.

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Kniestedt, C., Kanngiesser, H.E. Dynamische Konturtonometrie. Ophthalmologe 103, 713–723 (2006). https://doi.org/10.1007/s00347-006-1387-7

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  • DOI: https://doi.org/10.1007/s00347-006-1387-7

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