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Biomed Opt Express. 2017 Oct 3;8(11):4827-4837. doi: 10.1364/BOE.8.004827. eCollection 2017 Nov 1.

Lens internal curvature effects on age-related eye model and lens paradox.

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Studio Optometrico Giovanzana, Milano, Italy.
Department of Optometry, University of Johannesburg, Johannesburg, South Africa.
College of Science and Technology, School of Science & Technology, Nottingham Trent University, Nottingham, UK.


The gradient index (GRIN) model is the most accurate way to represent the eye lens which, because of its growth mode, is a lamellar, shell-like structure. The GRIN is thought to provide optical properties that counteract age-related changes in curvature that would otherwise create an increasingly myopic eye: the so-called lens paradox. This article investigates how fine-tuning the refractive index and the internal curvatures of the lenticular indicial contours may prevent the ageing eye from becoming myopic. A system matrix approach is applied for analysis of a shell model with 200 shells to obtain the paraxial characteristics of the eye model.


(110.2760) Gradient-index lenses; (170.4460) Ophthalmic optics and devices; (330.5370) Physiological optics; (330.7323) Visual optics, aging changes; (330.7326) Visual optics, modeling

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