Current understanding of the anatomy, function and performance of the accommodative system of the young, adult human eye is outlined. Most major current models of the accommodative mechanism are based on Helmholtz's original ideas but, despite of a growing volume of related research, uncertainty continues over the relative contributions made to the overall mechanism by different ocular structures. The changes with age are then discussed. Although the amplitude of accommodation decreases steadily from later childhood, the speed and accuracy of the system within the available amplitude are little impaired until the age of about 40, when the amplitude falls below that needed for normal near work. A review of the available evidence on age‐related change in the lens, capsule, ciliary body and other relevant ocular structures confirms that geometric and viscoelastic lenticular changes play major roles in the progressive loss of accommodation. Other factors may also contribute in an, as yet, unquantified way and a full understanding of the origins of presbyopic change remains elusive.

W Neil Charman

Clinical and Experimental Optometry

CLINICAL AND EXPERIMENTAL OPTOMETRY 是由 ISI 列出的同行评审期刊，由 PUBMED、WEB OF SCIENCE、SCOPUS、SCIENCE CITATION INDEX 和 CURRENT CONTENTS 进行摘要。它发表临床验光和视觉科学方面的原创研究论文和评论。鼓励对有争议的科学和临床问题进行辩论和讨论，并欢迎给编辑写信和表达对期刊感兴趣领域内问题的观点的简短交流。该期刊每年出版六次。

Clinical and Experimental Optometry is a peer-reviewed journal indexed by ISI, with abstracts available in PUBMED, WEB OF SCIENCE, SCOPUS, SCIENCE CITATION INDEX, and CURRENT CONTENTS. It publishes original research papers and reviews in the fields of clinical optometry and vision science. The journal encourages debate and discussion on controversial scientific and clinical issues and welcomes brief communications from readers expressing their views on topics of interest within the journal's scope. It is published six times a year.

《Clinical and Experimental Optometry》是一本经过同行评审的期刊，已被ISI收录，并在PUBMED、WEB OF SCIENCE、SCOPUS、SCIENCE CITATION INDEX和CURRENT CONTENTS中进行摘要。该期刊发表关于临床验光和视觉科学的原创研究论文和评论，鼓励对有争议的科学和临床问题进行辩论与讨论，并欢迎读者向编辑表达对期刊相关领域问题的看法。该期刊每年出版六期。

Clin Exp Optometry

The eye in focus: accommodation and presbyopia

A review of the available evidence on age‐related change in the lens, capsule, ciliary body and other relevant ocular structures confirms that geometric and viscoelastic lenticular changes play major roles in the progressive loss of accommodation.

Category	Quartile
医学	4
医学, 眼科学	4

The eye in focus: accommodation and presbyopia

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