Possible errors in determining axial length changes during accommodation

Atchison, David A. & Smith, George (2004) Possible errors in determining axial length changes during accommodation. Optometry and Vision Science, 81(4), pp. 283-286.


ABSTRACT: Purpose. The Zeiss IOLMaster uses partial coherence interferometry to measure the optical path length within the eye. This is converted into the axial length. There are errors in measuring possible changes in axial length as a result of accommodation, because the instrument uses an average refractive index in the eye. We determined the likely extent of these errors. Method. Errors were estimated using Gullstrand’s no. 1 schematic eyes. One set of these had the shell structure of the eyes, and another set had the gradient index structure specified by Gullstrand. Results. Errors were 18 to 26 m for an accommodation of 10.9 D. Conclusions. The worth of the IOLMaster would be increased if it used an equation for conversion from optical length to geometrical length that took into account variations in lens thickness and if it were able to be modified to provide component distances and the axial length using partial coherence tomography.

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ID Code: 5442
Item Type: Journal Article
Refereed: Yes
Additional Information: The contents of this journal can be freely accessed online via the journal’s web page (see link) 12 months after publication. For more information, please refer to the journal’s website (see link) or contact the author. Author contact details: d.atchison@qut.edu.au
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Keywords: axial length, gradient index, partial coherence interference, schematic eye, Zeiss IOLMaster
ISSN: 1538-9235
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2004 Lippincott Williams & Wilkins
Deposited On: 14 Nov 2006 00:00
Last Modified: 29 Feb 2012 13:09

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