Possible errors in determining axial length changes during accommodation
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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|Item Type:||Journal Article|
|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: firstname.lastname@example.org|
|Keywords:||axial length, gradient index, partial coherence interference, schematic eye, Zeiss IOLMaster|
|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|
|Last Modified:||29 Feb 2012 23:09|
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