Gradients of refractive index in the crystalline lens and transient changes in refraction among patients with diabetes

Charman, W. Neil, Adnan, & Atchison, David A. (2012) Gradients of refractive index in the crystalline lens and transient changes in refraction among patients with diabetes. Biomedical Optics Express, 3(12), pp. 3033-3042.

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Abstract

Transient hyperopic refractive shifts occur on a timescale of weeks in some patients after initiation of therapy for hyperglycemia, and are usually followed by recovery to the original refraction. Possible lenticular origin of these changes is considered in terms of a paraxial gradient index model. Assuming that the lens thickness and curvatures remain unchanged, as observed in practice, it appears possible to account for initial hyperopic refractive shifts of up to a few diopters by reduction in refractive index near the lens center and alteration in the rate of change between center and surface, so that most of the index change occurs closer to the lens surface. Restoration of the original refraction depends on further change in the refractive index distribution with more gradual changes in refractive index from the lens center to its surface. Modeling limitations are discussed.

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ID Code: 58980
Item Type: Journal Article
Refereed: Yes
ISSN: 2156-7085
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Vision Science (111303)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
Copyright Owner: Copyright 2012 Optical Society of America
Copyright Statement: This paper was published in Biomedical Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/boe/abstract.cfm?uri=boe-3-12-3033 Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Deposited On: 09 Apr 2013 02:02
Last Modified: 10 Apr 2013 17:25

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