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Vergence analysis reveals the influence of axial distances on accommodation with age and axial ametropia
Article first published online: 21 JUN 2010
DOI: 10.1111/j.1475-1313.2010.00749.x
© 2010 The Authors. Journal compilation © 2010 The College of Optometrists
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How to Cite
Davies, L. N., Dunne, M. C. M., Gibson, G. A. and Wolffsohn, J. S. (2010), Vergence analysis reveals the influence of axial distances on accommodation with age and axial ametropia. Ophthalmic and Physiological Optics, 30: 371–378. doi: 10.1111/j.1475-1313.2010.00749.x
Publication History
- Issue published online: 21 JUN 2010
- Article first published online: 21 JUN 2010
- Received: 4 September 2009 Revised form: 22 February 2010 Accepted: 22 March 2010
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Keywords:
- accommodation;
- age;
- ametropia;
- vergence analysis
Abstract
Despite numerous investigations, the aetiology and mechanism of accommodation and presbyopia remains equivocal. Using Gaussian first-order ray tracing calculations, we examine the contribution that ocular axial distances make to the accommodation response. Further, the influence of age and ametropia are also considered. The data show that all changes in axial distances during accommodation reduce the accommodation response, with the reduction in anterior chamber depth contributing most to this overall attenuation. Although the total power loss due to the changes in axial distances remained constant with increasing age, hyperopes exhibited less accommodation than myopes. The study, therefore, enhances our understanding of biometric accommodative changes and demonstrates the utility of vergence analysis in the assessment of accommodation.