Why we need reading-glasses before a zimmer-frame.
Accommodative loss represents the fastest human biological decrement. Why? To examine this, the shape of the eye-lens during accommodation or its relaxation is analysed with special reference to age-related changes. The capsule is viewed as a force transmitter: the distribution of forces along centripetal capsular arcs and the resulting stresses and strains are calculated. The effect of zonular 'shifts' is considered. Age-related accommodative loss can be modelled successfully if changes in mechanical properties are linked to those in lenticular and capsular shape.
Age Concern Institute of Gerontology, Waterloo Wing, King's College London, Waterloo Rd, SE1 8WA, London, UK. robert.weale@kcl.ac.uk
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D000065:Accommodation, Ocular / Q000502:physiology; D000293:Adolescent; D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D001696:Biomechanical Phenomena; D002648:Child; D002675:Child, Preschool; D005139:Eyeglasses; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007908:Lens, Crystalline / Q000502:physiology; D008875:Middle Aged; D011305:Presbyopia / Q000503:physiopathology* / Q000628:therapy