Vergence analysis reveals the influence of axial distances on accommodation with age and axial ametropia

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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.
LanguageEnglish
Pages371-378
Number of pages8
JournalOphthalmic and Physiological Optics
Volume30
Issue number4
DOIs
Publication statusPublished - Jul 2010

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Presbyopia
Refractive Errors
Anterior Chamber

Keywords

  • accommodation
  • age
  • ametropia
  • vergence analysis

Cite this

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title = "Vergence analysis reveals the influence of axial distances on accommodation with age and axial ametropia",
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.",
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