Document Detail

Evaluation of the impedance tonometers TGDc-01 and iCare according to the international ocular tonometer standards ISO 8612.
MedLine Citation:
PMID:  17318572     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Two new tonometers have been introduced that are based on the impedance principle. Both the TGDc-01 (transpalpebral measurement) and the iCare (corneal measurement) do not require corneal anaesthesia. The present work presents an evaluation of both devices. METHODS: Comparative measurements using one of the new tonometers and applanation tonometry were performed by one investigator according to the international standard for ocular tonometer (ISO 8612). Measurements were performed on 445 eyes without corneal pathology from 243 patients. Six measurements were performed for iCare and 3 for TGDc, immediately followed by 3 applanation tonometry measurements. RESULTS: The correlation coefficient with respect to applanation tonometry was 0.81 for TGDc and 0.95 for iCare. TGDc-01 measurements showed an average deviation of 3.1 +/- 2.6 mmHg to those of Perkins applanation tonometry. The maximum difference was 28.7 mmHg below and 9.8 mmHg above the results of applanation tonometry. iCare showed an average deviation of 2.5 +/- 1.1 mmHg to Goldmann tonometry. The maximum difference was 14.5 mmHg below and 9.8 mmHg above. CONCLUSIONS: The results of both new tonometers showed a good correlation with the reference applanation tonometric methods, but the strict requirements of ISO 8612 are not fulfilled by either tonometer at present. Additionally, transpalpebral measurements with the TGDc-01 showed unacceptably high variability.
Peter Christian Ruokonen; Thomas Schwenteck; Jörg Draeger
Publication Detail:
Type:  Comparative Study; Evaluation Studies; Journal Article     Date:  2007-02-21
Journal Detail:
Title:  Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv für klinische und experimentelle Ophthalmologie     Volume:  245     ISSN:  0721-832X     ISO Abbreviation:  Graefes Arch. Clin. Exp. Ophthalmol.     Publication Date:  2007 Sep 
Date Detail:
Created Date:  2007-08-16     Completed Date:  2007-12-06     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8205248     Medline TA:  Graefes Arch Clin Exp Ophthalmol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  1259-65     Citation Subset:  IM    
Department of Ophthalmology, Charité University Hospital Berlin Campus RVK, Augustenburger Platz 1, 13353 Berlin, Germany.
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MeSH Terms
Aged, 80 and over
Electric Impedance
Glaucoma / diagnosis
Intraocular Pressure*
Middle Aged
Reference Standards
Reproducibility of Results
Tonometry, Ocular / instrumentation*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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