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    Course Summary

    The DCT and contact lenses – Daniela Nosch & Malcolm Long (8:34)

    Malcolm Long speaks with Daniela Nosch from the University of Applied Sciences Northwestern Switzerland. A study carried out by Daniela and her colleagues in 2011 suggested that the presence of contact lenses does not alter the accuracy of dynamic contour tonometry (DCT) measurements, which are also independent of corneal thickness and rigidity. The interview touches on Daniela’s findings and compares this type of tonometry to Goldmann applanation tonometry. Daniela then discusses the benefits it can have for some groups of patients and for optometrists in countries not registered to use diagnostic drugs.

    First published in DOCET OQ77 (2011).

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      Learning objectives

      To provide listeners with:

      • An understanding of the accuracy of dynamic contour tonometery (DCT) and how this is used with patients who wear contact lenses
      • An outline of how DCT works and how it can be used
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        More information and references

        References:

        • Boehm AG, Weber A, Pillunat LE et al. (2008) Dynamic contour tonometry in comparison to intracameral IOP measurements. Invest Ophthalmol Vis Sci 49(6), 2472-7
        • Ehlers N, Bramsen T, Sperling S (1975) Applanation tonometry and central corneal thickness. Acta Ophthalmol (Copenh) 53(1), 34-43
        • Kaufmann C, Bachmann LM, Thiel MA (2004) Comparison of dynamic contour tonometry with goldmann applanation tonometry. Invest Ophthalmol Vis Sci 45(9), 3118-21
        • Schwenn O, Troost R, Vogel A et al. (2002) Ocular pulse amplitude in patients with open angle glaucoma, normal tension glaucoma, and ocular hypertension. Br J Ophthalmol 86(9), 981-4
        • Whitacre MM, Stein R (1993) Sources of error with use of Goldmann-type tonometers. Surv Ophthalmol 38(1), 1-30
        • Zhang MZ, Fu ZF, Liu XR et al. (2004) A comparison study of pulsitile ocular blood flow in normal eyes and primary open angle glaucoma. Zhonghua Yan Ke Za Zhi. 40(4), 250-3

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