Lens hardness not related to the age-related decline of accommodative amplitude
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منابع مشابه
Insights into the age-related decline in the amplitude of accommodation of the human lens using a non-linear finite-element model.
AIM To understand the effect of the geometric and material properties of the lens on the age-related decline in accommodative amplitude. METHODS Using a non-linear finite-element model, a parametric assessment was carried out to determine the effect of stiffness of the cortex, nucleus, capsule and zonules, and that of thickness of the capsule and lens, on the change in central optical power (...
متن کاملThe zonula, lens, and circumlental space in the normal iridectomized rhesus monkey eye.
PURPOSE To document zonular orientation and suspension of the lens during accommodation, and age-related changes of the circumlental space (CLS) at rest and during accommodation, in living iridectomized rhesus monkey eyes. METHODS The CLS was measured in 34 iridectomized eyes of 24 living rhesus monkeys, age 5.7 to 26 years, in the resting and accommodated state, and the orientation of the zo...
متن کاملOn the relationship between lens stiffness and accommodative amplitude.
The purpose of this study was to investigate the relationship between the stiffness of the material comprising the lens and the loss of accommodative amplitude with age. We used a validated mechanical model to determine the changes in the shape of the lens during accommodation and disaccommodation. The relative contribution of lens stiffness to loss of accommodative amplitude with age was deter...
متن کاملAccommodative ciliary body and lens function in rhesus monkeys, I: normal lens, zonule and ciliary process configuration in the iridectomized eye.
PURPOSE The underlying causes of presbyopia, and the functional relationship between the ciliary muscle and lens during aging are unclear. In the current study, these relationships were studied in rhesus monkeys, whose accommodative apparatus and age-related loss of accommodation are similar to those in humans. METHODS Centripetal ciliary body and lens equator movements were measured during a...
متن کاملMorphology and accommodative function of the vitreous zonule in human and monkey eyes.
PURPOSE To explore the attachments of the posterior zonule and vitreous in relation to accommodation and presbyopia in monkeys and humans. METHODS Novel scanning electron microscopy (SEM) and ultrasound biomicroscopy (UBM) techniques were used to visualize the anterior, intermediate, and posterior vitreous zonule and their connections to the ciliary body, vitreous membrane, lens capsule, and ...
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