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Study: CCT not correlated with Goldmann applanation or dynamic contour tonometry IOP readings
J Glaucoma. 2011;20(5):282-286.
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There was no correlation between central corneal thickness and either dynamic contour tonometry or Goldmann applanation tonometry IOP readings, a study found.
The dynamic contour tonometry (DCT) IOP readings were significantly higher than the Goldmann applanation tonometry (GAT) IOP readings (P < .001), leading the study authors to suggest that factors other than central corneal thickness may be the cause of DCT measuring higher IOP than GAT.
"Importantly, our study data suggests that DCT and GAT readings of IOP are not interchangeable," the study authors said.
In the Indianapolis Glaucoma Progression Study, IOP in the same eye in each of 116 patients with open-angle glaucoma was measured with both GAT and DCT. Central corneal thickness was tested with five consecutive readings using an ultrasonic corneal pachymeter to establish an accurate measurement.
There was a positive correlation between DCT and GAT IOP measurements for all patients with open-angle glaucoma. Mean IOP was 18.4 mm Hg for DCT, which was significantly higher (P < .001) than mean IOP of 16.5 mm Hg for GAT.
The authors noted the small sample size and lack of control group as limitations of the study.