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Biomedical Optics Express

Biomedical Optics Express

  • Editor: Joseph A. Izatt
  • Vol. 5, Iss. 5 — May. 1, 2014
  • pp: 1649–1663

An analytical method for predicting the geometrical and optical properties of the human lens under accommodation

Conor J. Sheil, Mehdi Bahrami, and Alexander V. Goncharov  »View Author Affiliations


Biomedical Optics Express, Vol. 5, Issue 5, pp. 1649-1663 (2014)
http://dx.doi.org/10.1364/BOE.5.001649


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Abstract

We present an analytical method to describe the accommodative changes in the human crystalline lens. The method is based on the geometry-invariant lens model, in which the gradient-index (GRIN) iso-indicial contours are coupled to the external shape. This feature ensures that any given number of iso-indicial contours does not change with accommodation, which preserves the optical integrity of the GRIN structure. The coupling also enables us to define the GRIN structure if the radii and asphericities of the external lens surfaces are known. As an example, the accommodative changes in lenticular radii and central thickness were taken from the literature, while the asphericities of the external surfaces were derived analytically by adhering to the basic physical conditions of constant lens volume and its axial position. The resulting changes in lens geometry are consistent with experimental data, and the optical properties are in line with expected values for optical power and spherical aberration. The aim of the paper is to provide an anatomically and optically accurate lens model that is valid for 3 mm pupils and can be used as a new tool for better understanding of accommodation.

© 2014 Optical Society of America

OCIS Codes
(080.1010) Geometric optics : Aberrations (global)
(330.4460) Vision, color, and visual optics : Ophthalmic optics and devices
(330.5370) Vision, color, and visual optics : Physiological optics
(080.2468) Geometric optics : First-order optics
(330.7322) Vision, color, and visual optics : Visual optics, accommodation
(330.7326) Vision, color, and visual optics : Visual optics, modeling

ToC Category:
Vision and Visual Optics

History
Original Manuscript: December 3, 2013
Revised Manuscript: February 19, 2014
Manuscript Accepted: March 18, 2014
Published: April 28, 2014

Citation
Conor J. Sheil, Mehdi Bahrami, and Alexander V. Goncharov, "An analytical method for predicting the geometrical and optical properties of the human lens under accommodation," Biomed. Opt. Express 5, 1649-1663 (2014)
http://www.opticsinfobase.org/boe/abstract.cfm?URI=boe-5-5-1649


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