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Deviations between transpalpebral tonometry using TGDc-01 and Goldmann applanation tonometry depending on the IOP
Annette Troost1, Kathrin Specht, Frank Krummenauer
1Department of Ophthalmology, Johannes Gutenberg University, Langenbeckstr. 1, 55131 Mainz, Germany. Annette.Troost@gmx.de
Summary
The TGDc-01 tonometer underestimates intraocular pressure (IOP) compared to Goldmann applanation tonometry, especially at higher IOP levels. This device deviation requires careful consideration in clinical practice for accurate IOP measurement.
Area of Science:
- Ophthalmology
- Medical Devices
- Tonometry
Background:
- Previous studies compared TGDc-01 and Goldmann applanation tonometry for intraocular pressure (IOP) in the 10-20 mmHg range.
- The clinical relevance of TGDc-01 device deviations across a wider IOP range (5-40 mmHg) remains to be fully elucidated.
Purpose of the Study:
- To evaluate the device deviations of TGDc-01 tonometry compared to Goldmann applanation tonometry across various intraocular pressure (IOP) levels.
- To determine if TGDc-01 shows consistent accuracy across the spectrum of IOP measurements.
Main Methods:
- Sixty-eight eyes were categorized into four IOP levels: <10, 10-19, 20-29, and >=30 mmHg.
- Two observers performed randomized, replicate measurements using TGDc-01 and Goldmann applanation tonometry.
- Intraindividual deviations were analyzed for clinical relevance and statistical significance.
Main Results:
- TGDc-01 significantly underestimated IOP in eyes with initial IOP >=20 mmHg (p<0.001).
- Underestimation increased with IOP: median differences were -1.3 mmHg (level III) and -2.7 mmHg (level IV).
- 18% of patients showed deviations > +/-3 mmHg, including 35% of those with IOP >=30 mmHg.
Conclusions:
- TGDc-01 tonometry shows an increasing underestimation of IOP as IOP levels rise, relative to Goldmann applanation tonometry.
- The findings highlight potential inaccuracies of TGDc-01 at higher IOPs, necessitating careful clinical interpretation.