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Biomedical Optics Express

Biomedical Optics Express

  • Editor: Joseph A. Izatt
  • Vol. 5, Iss. 1 — Jan. 1, 2014
  • pp: 31–39

Age-dependence of the average and equivalent refractive indices of the crystalline lens

W. Neil Charman and David A. Atchison  »View Author Affiliations


Biomedical Optics Express, Vol. 5, Issue 1, pp. 31-39 (2014)
http://dx.doi.org/10.1364/BOE.5.000031


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Abstract

Lens average and equivalent refractive indices are required for purposes such as lens thickness estimation and optical modeling. We modeled the refractive index gradient as a power function of the normalized distance from lens center. Average index along the lens axis was estimated by integration. Equivalent index was estimated by raytracing through a model eye to establish ocular refraction, and then backward raytracing to determine the constant refractive index yielding the same refraction. Assuming center and edge indices remained constant with age, at 1.415 and 1.37 respectively, average axial refractive index increased (1.408 to 1.411) and equivalent index decreased (1.425 to 1.420) with age increase from 20 to 70 years. These values agree well with experimental estimates based on different techniques, although the latter show considerable scatter. The simple model of index gradient gives reasonable estimates of average and equivalent lens indices, although refinements in modeling and measurements are required.

© 2013 Optical Society of America

OCIS Codes
(330.4460) Vision, color, and visual optics : Ophthalmic optics and devices
(330.7326) Vision, color, and visual optics : Visual optics, modeling

ToC Category:
Ophthalmology Applications

History
Original Manuscript: September 20, 2013
Revised Manuscript: November 17, 2013
Manuscript Accepted: November 22, 2013
Published: December 2, 2013

Citation
W. Neil Charman and David A. Atchison, "Age-dependence of the average and equivalent refractive indices of the crystalline lens," Biomed. Opt. Express 5, 31-39 (2014)
http://www.opticsinfobase.org/boe/abstract.cfm?URI=boe-5-1-31


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