Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/30460
Title: Should Orbscan pachometry be performed before or after Goldmann applanation tonometry?
Authors: Huang, RYC
Lam, AKC 
Chan, R
Young, SM
Keywords: Central corneal thickness
Goldmann applanation tonometry
Intraocular pressure
Topical anaesthetics
Issue Date: 2005
Publisher: Wiley-Blackwell
Source: Ophthalmic and physiological optics, 2005, v. 25, no. 5, p. 441-445 How to cite?
Journal: Ophthalmic and physiological optics 
Abstract: Purpose: To compare the Orbscan central corneal thickness (CCT) values before and after intraocular pressure (IOP) measurement with Goldmann applanation tonometry in young normal adults. Materials and Methods: Fifty-three eyes of 53 subjects who were free from any ocular problems were studied. The measurements included optical pachometry by the Orbscan II system, followed by Goldmann applanation tonometry, and finally Orbscan optical pachometry again. Standard Goldmann technique was adopted with the application of one drop of 0.4% benoxinate and fluorescein sodium prior to the measurement. The same operator was involved in the Orbscan pachometry before and after Goldmann tonometry. Another investigator was responsible for Goldmann tonometry. Three readings were obtained in each case, and the means were used for analysis. Results: The mean IOP of the sample was 14.6 ± 2.6 mmHg. There was no significant difference (paired t-test: p = 0.50) in the mean CCT values before and after the Goldmann tonometry (551 ± 32 and 552 ± 35 μm respectively). Conclusion: Standard Goldmann applanation tonometry does not affect the Orbscan CCT values. Measurement of CCT for the adjustment of true IOP can be carried out either before or after Goldmann tonometry.
URI: http://hdl.handle.net/10397/30460
ISSN: 0275-5408
EISSN: 1475-1313
DOI: 10.1111/j.1475-1313.2005.00321.x
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