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104. Jahrestagung der Deutschen Ophthalmologischen Gesellschaft 2006
Abstract
Abstract
FR.01.08 The impact of pachymetry in the management of glaucoma Pache M.
Augenklinik, Universitätsklinikum Freiburg Pachymetry has an increasing impact in the management of glaucoma. It could be demonstrated that central corneal thickness (CCT) influences Goldmann applanation tonometry (GAT) values. In patients with high CCT, for example, IOP might be overestimated when measured by GAT. We will discuss various correction factors that have been proposed for this problem.
A number of studies indicate that not only interindividual differences of CCT, but also corneal pathologies may influence GAT. This can be a problem in glaucoma suspects with additional corneal disease, and also after LASIK and after penetrating keratoplasty. The PASCAL - Dynamic Contour Tonometer (DCT), a novel device for IOP measurements supposed to be largely independent of CCT, will be discussed in this context. Another new observation is that not only CCT, but also corneal hysteresis has an influence on GAT measurements. The new Ocular Response Analyzer may provide deeper insight into this new field of research.
According to the Ocular Hypertension Treatment Study (OHTS) data, CCT appears to be also an independent risk factor for glaucoma, with the risk of conversion increasing with lower CCT values. Some studies also indicate lower CCT values in patients with normal-tension glaucoma. Therefore, some OHT patients might be misclassified and over-treated, and vice versa, the IOP might be underestimated in patients with normal-tension glaucoma.
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