Document Detail

The influence of central corneal thickness and corneal curvature radius on the intraocular pressure as measured by different tonometers: noncontact and goldmann applanation tonometers.
MedLine Citation:
PMID:  19092456     Owner:  NLM     Status:  MEDLINE    
PURPOSE: The aim of this study was to examine whether or not central corneal thickness (CCT) and corneal curvature radius (CCR) influence the concordance of intraocular pressure (IOP) readings taken with a noncontact tonometer (NCT) and a Goldmann applanation tonometer (GAT). METHODS: Eighty-seven eyes from 87 patients without any histories of intraocular operation were enrolled in the present study. We calculated the difference in IOP readings between the 2 methods (NCT-GAT), and then examined the relationship between the IOP readings, and CCT and CCR using a linear regression line. RESULTS: IOP measured by both NCT (r=0.515, P<0.0001) and GAT (r=0.237, P<0.05) was significantly correlated with CCT. NCT readings were significantly higher in the thicker group (CCT>or=526.9 microm) than in the thinner group (CCT<526.9 microm) (P<0.005). GAT readings had no difference between the thicker and thinner groups. IOP measured by GAT (r=-0.261, P<0.05), but not that measured by NCT (r=-0.111, P=0.3042), showed a significant negative correlation with CCR. An IOP value of (NCT-GAT) had a significant positive correlation with not only CCT (r=0.666, P<0.0001) but also CCR (r=0.227, P<0.05). The value of (NCT-GAT) was significantly higher in the thicker group than in the thinner group (P<0.005). CONCLUSIONS: NCT can be more affected by CCT than GAT. CCR could influence the measurements of GAT, but not those by NCT. CCT and CCR can therefore influence the discordance of IOP readings taken with NCT and GAT.
Yukinori Harada; Naofumi Hirose; Toshiaki Kubota; Akihiko Tawara
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of glaucoma     Volume:  17     ISSN:  1536-481X     ISO Abbreviation:  J. Glaucoma     Publication Date:  2008 Dec 
Date Detail:
Created Date:  2008-12-18     Completed Date:  2009-02-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9300903     Medline TA:  J Glaucoma     Country:  United States    
Other Details:
Languages:  eng     Pagination:  619-25     Citation Subset:  IM    
Department of Ophthalmology, School of Medicine, University of Occupational and Environmental Health, Kitakyushu-shi, Fukuoka, Japan.
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MeSH Terms
Aged, 80 and over
Cornea / anatomy & histology,  pathology*
Glaucoma, Angle-Closure / physiopathology*
Glaucoma, Open-Angle / physiopathology*
Intraocular Pressure / physiology*
Middle Aged
Ocular Hypertension / physiopathology
Reference Values
Tonometry, Ocular / standards*
Young Adult

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

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