Transpalpebral Tonometry with a Digital Tonometer in Healthy Eyes and after Penetrating Keratoplasty
Amm M.1, Hedderich J.2
1University Eye Hospital, 2Institute for Medical Statistics of the Christian-Albrechts-University Kiel
Purpose: The Goldmann applanation technique established itself as gold standard for clinical IOP measurement. But the device measures by corneal touch and presupposes corneal conditions within a normal range. So precise determination of IOP is crucial in corneal disorders and after corneal surgery. This pilot study presents tonometry data measured transpalpebrally with a digital tonometer in comparison to the Goldmann tonometry.
Method: The TGDc-01 tonometer bases on a ballistic principle of IOP measurement. 40 healthy eyes and 40 eyes after penetrating keratoplasty were measured first by the TGDc-01 and after 3 minutes by Goldmann tonometry (Haag-Streit). Subjective refraction, keratometry and ultrasonic pachymetry were performed in all eyes. The IOP measurements in the postkeratoplasty eyes were done when corneal epithelium was fully closed and only a faint suture edema could be observed. The results were analysed by calculating the correlation and the agreement (approach of Bland and Altman).
Results: The Pearsons product-moment correlation was r=0.89. Using the spearmans rank correlation, to assess the mean variation, the values showed a clear correlation (r=0.79). We found a good agreement between both procedures based on the Bland-Altman-analysis. In 70.1% of the cases the difference betw
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