Document Detail

Repeatability of intra-ocular pressure and central corneal thickness measurements provided by a non-contact method of tonometry and pachymetry.
MedLine Citation:
PMID:  20981434     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: To examine the repeatability of intra-ocular pressure (IOP) and central corneal thickness (CCT) measurements provided by the Tono-Pachymeter NT530P (Nidek, Japan), and to assess agreement of the device with Goldmann applanation tonometry (GAT) and ultrasound pachymetry (UP).
METHODS: Sixty-two normal eyes of 62 subjects were included in the study. Three sessions of measurements, each consisting of three sets of measurements, were completed with each device. Repeatability was determined with the coefficient of variation (CoV) and the coefficient of repeatability (CoR) values. Agreement between devices was examined by Bland-Altman analysis and intraclass correlation coefficient (ICC) analyses.
RESULTS: The CoV and CoR for IOP values were 18.4% and 5.5 mmHg with the NT530P and 16.6% and 4.3 mmHg with the GAT respectively. On average, NT530P overestimated the IOP compared with GAT by 1.3 mmHg. The 95% limits of agreement between the methods ranged from -5.9 to +3.3 mmHg, and the ICC for average IOP measures between devices was 0.64 (P < 0.001). The CoV and CoR for CCT measurements were 5.5% and 59.8 μm with the NT530P and 5.5% and 60.5 μm with UP. NT530P CCT readings were on average 13 μm thinner than those obtained with UP. The 95% limits of agreement (LoA) ranged from -7.4 to +33.1 μm, and the ICC for average CCT measures between devices was 0.93 (P < 0.001).
CONCLUSION: The NT530P demonstrated high IOP and CCT measurement repeatability in the normal population studied. The device tended to slightly overestimate IOP compared to GAT. CCT values provided by NT530P were interchangeable with those of UP.
Domenico Schiano Lomoriello; Marco Lombardo; Laura Tranchina; Francesco Oddone; Sebastiano Serrao; Pietro Ducoli
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Publication Detail:
Type:  Comparative Study; Journal Article     Date:  2010-10-28
Journal Detail:
Title:  Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv für klinische und experimentelle Ophthalmologie     Volume:  249     ISSN:  1435-702X     ISO Abbreviation:  Graefes Arch. Clin. Exp. Ophthalmol.     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-03-16     Completed Date:  2011-06-03     Revised Date:  2011-07-26    
Medline Journal Info:
Nlm Unique ID:  8205248     Medline TA:  Graefes Arch Clin Exp Ophthalmol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  429-34     Citation Subset:  IM    
IRCCS Fondazione G.B. Bietti, Rome, Italy.
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MeSH Terms
Cornea / ultrasonography*
Intraocular Pressure / physiology*
Reproducibility of Results
Tonometry, Ocular / instrumentation*

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