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The aetiology of presbyopia: a summary of the role of lenticular and extralenticular structures.
Ophthalmic Physiol Opt. 1995 Sep; 15(5):431-7.OP

Abstract

Presbyopia is a condition of age rather than ageing and, as such, is devolved from the lamentable situation where the normal age-related reduction in amplitude of accommodation reaches a point when the clarity of vision at near cannot be sustained for long enough to satisfy an individual's requirements. Most of our facility to accommodate has been lost by 55 years-of-age and subsequent deterioration in visual performance at near is attributable to characteristics of senescent vision familiar to the optometrist. Our understanding of the cause of presbyopia has then to be derived principally from our understanding of the mechanism of accommodation in young eyes. Hermann von Helmholtz did much to clarify these mechanisms, but despite much research in the 100 years since his death, there is still no consensus on their precise nature. This paper presents a summary of issues, past and present, which have figured in the literature on the physiology of accommodation and presbyopia, and confirms that the pathophysiology of presbyopia is likely to result from deterioration in structure and function of a number of inter-related tissues. Changes in crystalline lens dimensions with age, the associated change in geometry of zonular attachments, and changes in viscoelastic properties of the lens capsule and lens matrix would, however, appear to be the principal correlates for the onset of presbyopia. Recent models of the biomechanics of accommodation have drawn attention to the feasibility of extralenticular contributions to presbyopia and have examined properties of the elasticity and leverage provided by posterior, anterior and tensile fibre systems.(

ABSTRACT

TRUNCATED AT 250 WORDS)

Authors+Show Affiliations

Department of Vision Sciences, Aston University, Birmingham, UK.

Pub Type(s)

Journal Article
Review

Language

eng

PubMed ID

8524570

Citation

Gilmartin, B. "The Aetiology of Presbyopia: a Summary of the Role of Lenticular and Extralenticular Structures." Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists), vol. 15, no. 5, 1995, pp. 431-7.
Gilmartin B. The aetiology of presbyopia: a summary of the role of lenticular and extralenticular structures. Ophthalmic Physiol Opt. 1995;15(5):431-7.
Gilmartin, B. (1995). The aetiology of presbyopia: a summary of the role of lenticular and extralenticular structures. Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists), 15(5), 431-7.
Gilmartin B. The Aetiology of Presbyopia: a Summary of the Role of Lenticular and Extralenticular Structures. Ophthalmic Physiol Opt. 1995;15(5):431-7. PubMed PMID: 8524570.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The aetiology of presbyopia: a summary of the role of lenticular and extralenticular structures. A1 - Gilmartin,B, PY - 1995/9/1/pubmed PY - 1995/9/1/medline PY - 1995/9/1/entrez SP - 431 EP - 7 JF - Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists) JO - Ophthalmic Physiol Opt VL - 15 IS - 5 N2 - Presbyopia is a condition of age rather than ageing and, as such, is devolved from the lamentable situation where the normal age-related reduction in amplitude of accommodation reaches a point when the clarity of vision at near cannot be sustained for long enough to satisfy an individual's requirements. Most of our facility to accommodate has been lost by 55 years-of-age and subsequent deterioration in visual performance at near is attributable to characteristics of senescent vision familiar to the optometrist. Our understanding of the cause of presbyopia has then to be derived principally from our understanding of the mechanism of accommodation in young eyes. Hermann von Helmholtz did much to clarify these mechanisms, but despite much research in the 100 years since his death, there is still no consensus on their precise nature. This paper presents a summary of issues, past and present, which have figured in the literature on the physiology of accommodation and presbyopia, and confirms that the pathophysiology of presbyopia is likely to result from deterioration in structure and function of a number of inter-related tissues. Changes in crystalline lens dimensions with age, the associated change in geometry of zonular attachments, and changes in viscoelastic properties of the lens capsule and lens matrix would, however, appear to be the principal correlates for the onset of presbyopia. Recent models of the biomechanics of accommodation have drawn attention to the feasibility of extralenticular contributions to presbyopia and have examined properties of the elasticity and leverage provided by posterior, anterior and tensile fibre systems.(ABSTRACT TRUNCATED AT 250 WORDS) SN - 0275-5408 UR - https://www.unboundmedicine.com/medline/citation/8524570/The_aetiology_of_presbyopia:_a_summary_of_the_role_of_lenticular_and_extralenticular_structures_ L2 - https://linkinghub.elsevier.com/retrieve/pii/0275-5408(95)00095-U DB - PRIME DP - Unbound Medicine ER -