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Comparison of dynamic contour tonometry and goldmann applanation tonometry in African American subjects.

Abstract：

PURPOSE:To evaluate the relationship between intraocular pressure (IOP) measurements obtained by dynamic contour tonometry (DCT) and Goldmann applanation tonometry (GAT) in African Americans and to assess whether these measures were influenced by ocular parameters including corneal thickness, corneal curvature, and axial length. DESIGN:Observational clinical study. PARTICIPANTS:The study included 176 eyes of 94 African Americans. METHODS:All participants underwent IOP evaluation with DCT and GAT, as well as measurements of central corneal thickness (CCT), corneal curvature, corneal astigmatism, spherical equivalent, and axial length. MAIN OUTCOME MEASURES:Univariate and multiple regression analyses were used to evaluate the associations between IOP (as measured with DCT and GAT) and CCT, corneal curvature, corneal astigmatism, spherical equivalent, axial length, and age. Bland-Altman plots were used to evaluate the agreement between IOP measurements obtained by DCT and GAT. RESULTS:In multiple regression analysis, GAT IOP measurements were significantly associated with CCT (P<0.001) and age (P = 0.003), whereas DCT IOP measurements were associated only with age (P = 0.027). The difference between DCT and GAT IOP measurements was significantly influenced by corneal thickness (P<0.001) and ocular pulse amplitude (OPA; P = 0.004). Patients with thick corneas tended to have higher GAT IOP measurements compared with DCT, whereas in patients with thin corneas, GAT IOP measurements tended to be lower than DCT measurements. Larger values of OPA were associated with a decrease in the difference between DCT and GAT measurements, whereas smaller values of OPA were associated with an increase in the difference between DCT and GAT measurements. CONCLUSIONS:Dynamic contour tonometry measurements in African Americans seem to provide an estimate of IOP that is less influenced by corneal properties than those provided by GAT.

journal_name

Ophthalmology

journal_title

Ophthalmology

authors

Medeiros FA,Sample PA,Weinreb RN

doi

10.1016/j.ophtha.2006.06.065

subject

Has Abstract

pub_date

2007-04-01 00:00:00

pages

658-65

issue

4

eissn

0161-6420

issn

1549-4713

pii

S0161-6420(06)01151-1

journal_volume

114

pub_type

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