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Sustained convergence, axial length, and corneal topography

Read, Scott A., Collins, Michael J., Cheong, Shiow-Huoy, & Woodman, Emily (2010) Sustained convergence, axial length, and corneal topography. Optometry and Vision Science, 87(1), E45-E52.

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Abstract

Purpose: To investigate the influence of convergence on axial length and corneal topography in young adult subjects.---------- Methods: Fifteen emmetropic young adult subjects with normal binocular vision had axial length and corneal topography measured immediately before and after a 15-min period of base out (BO) prismatic spectacle lens wear. Two different magnitude prismatic spectacles were worn in turn (8 [DELTA] BO and 16 [DELTA] BO), and for both tasks, distance fixation was maintained for the duration of lens wear. Eight subjects returned on a separate day for further testing and had axial length measured before, during, and immediately after a 15-min convergence task.---------- Results: No significant change was found to occur in axial length either during or after the sustained convergence tasks (p > 0.6). Some small but significant changes in corneal topography were found to occur after sustained convergence. The most significant corneal change was observed after the 16 [DELTA] BO prism wear. The corneal refractive power spherocylinder power vector J0 was found to change by a small (mean change of 0.03 D after the 16 [DELTA] BO task) but statistically significant (p = 0.03) amount as a result of the convergence task (indicative of a reduction in with-the-rule corneal astigmatism after convergence). Corneal axial power was found to exhibit a significant flattening in superior regions. Conclusions: Axial length appears largely unchanged by a period of sustained convergence. However, small but significant changes occur in the topography of the cornea after convergence.

Impact and interest:

2 citations in Scopus
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2 citations in Web of Science®

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ID Code: 38244
Item Type: Journal Article
Additional URLs:
Keywords: Corneal topography, Axial length, Convergence, astigmatism, refractive error
DOI: 10.1097/OPX.0b013e3181c07923
ISSN: 1538-9235
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
Copyright Owner: Copyright 2010 American Academy of Optometry
Deposited On: 04 Nov 2010 07:56
Last Modified: 01 Mar 2012 00:12

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