title: Goldmann Applanation Tonometry versus Dynamic Contour Tonometry after Vitrectomy with Silicone Oil Endotamponade.
abstract: To evaluate the agreement of intraocular pressure (IOP) measurements using dynamic contour tonometry (DCT) and Goldmann applanation tonometry (GAT) in eyes after vitrectomy with silicone oil endotamponade and controls.
  
  
  
  In this prospective comparative study, IOP was measured with GAT and DCT in 30 eyes with oil endotamponade 1-3 days after vitrectomy and 40 untreated controls. In addition, ocular pulse amplitude (OPA), corneal pachymetry (CCT), and axial length (AL) were measured.
  
  
  
  GAT values in the oil group were significantly higher compared to control eyes (mean GAT oil 13.6 ± 5.1 mmHg; mean GAT control 10.8 ± 2.1 mmHg; p = 0.003). There was no significant difference in DCT measurements (mean DCT oil 12.0 ± 4.1 mmHg; mean DCT control 11.9 ± 2.9 mmHg; p = 0.9). This led to a significant difference of GAT-DCT between the oil and control group (mean difference of GAT-DCT oil 1.6 ± 4.7 mmHg; mean difference of GAT-DCT control -1.1 ± 2.6 mmHg; p = 0.004). The difference between GAT and DCT was negatively correlated with the mean IOP measured by both methods (r = -0.36, p = 0.02) and positively correlated with CCT only in the control group (r = 0.36, p = 0.02), as well as to AL only in the oil group (r = 0.46, p = 0.01). The OPA did not differ significantly between groups.
  
  
  
  GAT and DCT showed a good agreement in control eyes. The difference of GAT and DCT is significantly changed in eyes after vitrectomy with silicone oil endotamponade. Our findings suggest that GAT overestimates IOP in this situation.
authors.affiliation: a Department of Ophthalmology , RWTH Aachen University , Aachen , Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Fuest
authors.affiliation: b 1st Department of Ophthalmology , University of Athens , Athens , Greece.
authors.forename: Nikolaos
authors.initials: N
authors.lastname: Mamas
authors.affiliation: a Department of Ophthalmology , RWTH Aachen University , Aachen , Germany.
authors.forename: Peter
authors.identifier: 0000-0001-8745-6593
authors.initials: P
authors.lastname: Walter
authors.affiliation: a Department of Ophthalmology , RWTH Aachen University , Aachen , Germany.
authors.forename: Babac E
authors.initials: BE
authors.lastname: Mazinani
authors.affiliation: a Department of Ophthalmology , RWTH Aachen University , Aachen , Germany.
authors.forename: Gemot
authors.initials: G
authors.lastname: Roessler
authors.affiliation: a Department of Ophthalmology , RWTH Aachen University , Aachen , Germany.
authors.forename: Niklas
authors.initials: N
authors.lastname: Plange
mesh_terms: D000368:Aged; D015862:Choroid Diseases / Q000175:diagnosis / Q000503:physiopathology / Q000601:surgery*; D058450:Endotamponade / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007429:Intraocular Pressure / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D011184:Postoperative Period; D011446:Prospective Studies; D012372:ROC Curve; D012164:Retinal Diseases / Q000175:diagnosis / Q000503:physiopathology / Q000601:surgery*; D012827:Silicone Oils / Q000494:pharmacology*; D014065:Tonometry, Ocular / Q000379:methods*; D014821:Vitrectomy / Q000379:methods*
chemical_list: D012827:Silicone Oils
keywords: Dynamic contour tonometry; Goldmann applanation tonometry; silicone oil; tamponade; vitrectomy