Document Detail

Influence of corneal parameters in keratoconus on IOP readings obtained with different tonometers.
MedLine Citation:
PMID:  23320621     Owner:  NLM     Status:  Publisher    
BACKGROUND: Accurate intraocular pressure (IOP) measurement is important but of unsure reliability in patients with keratoconus. Different types and models of tonometers are available. This study investigated the influence of corneal parameters on IOP readings obtained by a Goldmann applanation tonometer, a non-contact tonometer and a dynamic contour tonometer. METHODS: IOP readings with the Goldmann applanation, non-contact and dynamic contour tonometers were obtained from 52 patients with keratoconus and from 50 normal subjects and their corneal parameters were measured using a Pentacam. RESULTS: The mean IOP measurements in keratoconus obtained with the Goldmann applanation, non-contact and dynamic contour tonometers were statistically significantly different from the mean IOP measurements in the normal subjects (p < 0.0001; p < 0.005; p < 0.0001, respectively). In the keratoconus group, the thinnest corneal thickness (TCT), steepest keratometry, the corneal curvature (CC), central corneal thickness (CCT) and the posterior corneal curvature (PCC) had a significant effect on the Goldmann applanation and non-contact tonometers but not on the dynamic contour tonometer. In the control group, thinnest and central corneal thicknesses had a significant effect on findings with the Goldmann and non-contact tonometers but not on the dynamic contour tonometer. The corneal volume (CV) had no significant effect on the three tonometers in both groups. CONCLUSIONS: The corneal parameters affecting the IOP readings of the Goldmann applanation tonometers, non-contact tonometers and the dynamic contour tonometers are not the same. While the Goldmann applanation and non-contact tonometers were significantly affected by the corneal parameters that were measured, the dynamic contour tonometer was not affected by any of these corneal parameters.
Penpe Gul Firat; Gozde Orman; Selim Doganay; Soner Demirel
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-16
Journal Detail:
Title:  Clinical & experimental optometry : journal of the Australian Optometrical Association     Volume:  -     ISSN:  1444-0938     ISO Abbreviation:  Clin Exp Optom     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8703442     Medline TA:  Clin Exp Optom     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2013 The Authors. Clinical and Experimental Optometry © 2013 Optometrists Association Australia.
Department of Ophthalmology, Inonu University School of Medicine, Malatya, Turkey.
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