Sustained convergence, axial length, and corneal topography


Autoria(s): Read, Scott A.; Collins, Michael J.; Cheong, Shiow-Huoy; Woodman, Emily
Data(s)

01/01/2010

Resumo

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.

Formato

application/pdf

Identificador

http://eprints.qut.edu.au/38244/

Publicador

Lippincott, Williams & Wilkins

Relação

http://eprints.qut.edu.au/38244/1/c38244.pdf

DOI:10.1097/OPX.0b013e3181c07923

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.

Direitos

Copyright 2010 American Academy of Optometry

Fonte

Faculty of Health; Institute of Health and Biomedical Innovation; School of Optometry & Vision Science

Palavras-Chave #Corneal topography #Axial length #Convergence #astigmatism #refractive error
Tipo

Journal Article