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Updated: Jul 3, 2026
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Binocular Dynamic Visual Acuity in Eyeglass-Corrected Myopic Patients
Published on: March 29, 2022
[Evaluation of dynamic contour tonometry in keratoconus]
N Schädle1, J D Unterlauft, T Klink
1Universitäts-Augenklinik Würzburg, Würzburg, Deutschland.
Summary
Dynamic contour tonometry (DCT) measures intraocular pressure (IOP) higher than Goldmann applanation tonometry (GAT) in keratoconus patients. Both DCT and GAT are independent of central corneal thickness (CCT) for IOP monitoring.
Area of Science:
- Ophthalmology
- Biomedical Engineering
Background:
- Goldmann applanation tonometry (GAT) is the standard for intraocular pressure (IOP) measurement but is influenced by corneal properties.
- Keratoconus, a condition with abnormal corneal geometry and thickness, poses challenges for accurate GAT measurements.
Purpose of the Study:
- To compare the impact of central corneal thickness (CCT) on IOP measurements using dynamic contour tonometry (DCT) and GAT in keratoconus patients.
- To evaluate the adaptability of DCT to corneal geometry for IOP assessment.
Main Methods:
- IOP was measured in 54 keratoconus patients using GAT and DCT in a randomized order.
- Central corneal thickness (CCT) was measured using Pentacam, and data were analyzed with Pearson correlation and Bland-Altman plots.
Main Results:
- Dynamic contour tonometry (DCT) yielded a higher mean IOP (14.9 mmHg) compared to Goldmann applanation tonometry (GAT) (13.3 mmHg).
- Neither GAT nor DCT showed a significant correlation with central corneal thickness (CCT) in this keratoconus cohort.
Conclusions:
- Dynamic contour tonometry (DCT) measures significantly higher IOP than Goldmann applanation tonometry (GAT) in keratoconus.
- Both DCT and GAT are independent of CCT and suitable for IOP follow-up in keratoconus eyes, despite potential long-term corneal thinning.
