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Goldmann Applanation Tonometry Versus Dynamic Contour Tonometry After Vitrectomy.

Nikolaos Mamas1, Matthias Fuest, Antonios Koutsonas

  • 1Department of Ophthalmology, RWTH Aachen University, Aachen, Germany.

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|March 8, 2016
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Dynamic contour tonometry (DCT) underestimates intraocular pressure (IOP) in gas-filled eyes post-vitrectomy compared to Goldmann applanation tonometry (GAT). Agreement is good in non-gas eyes, but DCT and GAT are not interchangeable after gas endotamponade.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering

Background:

  • Intraocular pressure (IOP) measurement is crucial for glaucoma management.
  • Vitrectomy with intraocular gas endotamponade is a common surgical procedure.
  • Accurate IOP measurement after such procedures can be challenging.

Purpose of the Study:

  • To compare IOP measurements between dynamic contour tonometry (DCT) and Goldmann applanation tonometry (GAT).
  • To evaluate the agreement of DCT and GAT in eyes with and without intraocular gas tamponade after vitrectomy, and in control eyes.

Main Methods:

  • A prospective comparative study involving 41 eyes with gas endotamponade, 32 postvitrectomy eyes without tamponade, and 46 control eyes.
  • IOP was measured using both GAT and DCT.
  • Corneal pachymetry and axial length were also recorded.

Main Results:

  • In gas-filled eyes, GAT measured 3.1 mm Hg higher than DCT (mean difference).
  • A significant correlation was found between GAT-DCT difference and IOP in gas-filled eyes (r=0.71, P<0.0001).
  • Good agreement was observed between DCT and GAT in postvitrectomy eyes without gas and in control eyes, though with interindividual variability.

Conclusions:

  • DCT underestimates IOP in gas-filled eyes compared to GAT, with underestimation increasing at higher IOPs.
  • The two tonometry methods (DCT and GAT) are not interchangeable for IOP assessment after vitrectomy with gas endotamponade.
  • Careful consideration is needed for IOP monitoring in these challenging cases.