Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/18108
Title: Comparison of IOP measurements between ORA and GAT in normal Chinese
Authors: Lam, A 
Chen, D
Chiu, R
Chui, WS
Keywords: Corneal hysteresis
Corneal resistance factor
Corneal thickness
Intraocular pressure
Ocular response analyzer
Issue Date: 2007
Publisher: Lippincott Williams & Wilkins
Source: Optometry and vision science, 2007, v. 84, no. 9, p. 909-914 How to cite?
Journal: Optometry and vision science 
Abstract: PURPOSE. To compare intraocular pressure (IOP) obtained from the ocular response analyzer (ORA) and Goldmann applanation tonometer (GAT) on a group of normal Chinese. METHODS. One hundred twenty-five normal subjects were recruited, with one eye randomly selected for this study. Each eye was measured first with the noncontact tonometer ORA, followed by the GAT and ultrasound pachometry, in a randomized order. Four readings were obtained from the ORA, and three measurements were taken with the GAT. The mean was used for analysis. The ORA provided a Goldmann-correlated IOP (IOPg) and a corneal-compensated IOP (IOPcc). Three central corneal thickness (CCT) values were measured using an ultrasound pachometer, and the mean was used for analysis. RESULTS. IOP obtained from the ORA was similar to that from the GAT (IOPg minus GAT: mean difference = 0.33 mm Hg, 95% limits of agreement = 4.55 to -4.44 mm Hg; IOPcc minus GAT: mean difference = 0.24 mm Hg, 95% limits of agreement = 4.83 to -5.07 mm Hg). CCT was positively associated with corneal hysteresis (CH) (r = 0.30, p < 0.01), corneal resistance factor (r = 0.38, p < 0.01), GAT (r = 0.09, p < 0.01) and IOPg (r = 0.16, p < 0.01). IOPcc was not associated with CCT (r = 0.01, p = 0.33). CONCLUSIONS. Both IOPg and IOPcc have good agreement with GAT on normal subjects. The influence of CCT on IOPcc was insignificant.
URI: http://hdl.handle.net/10397/18108
ISSN: 1040-5488
EISSN: 1538-9235
DOI: 10.1097/OPX.0b013e3181559db2
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