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Estimation of the depth focus from wavefront measurements

Yi, Fan, Iskander, D. Robert, & Collins, Michael J. (2010) Estimation of the depth focus from wavefront measurements. Journal of Vision, 10(4), pp. 1-9.

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Abstract

It is possible to estimate the depth of focus (DOF) of the eye directly from wavefront measurements using various retinal image quality metrics (IQMs). In such methods, DOF is defined as the range of defocus error that degrades the retinal image quality calculated from IQMs to a certain level of the maximum value. Although different retinal image quality metrics are used, currently there have been two arbitrary threshold levels adopted, 50% and 80%. There has been limited study of the relationship between these threshold levels and the actual measured DOF. We measured the subjective DOF in a group of 17 normal subjects, and used through-focus augmented visual Strehl ratio based on optical transfer function (VSOTF) derived from their wavefront aberrations as the IQM. For each subject, a VSOTF threshold level was derived that would match the subjectively measured DOF. Significant correlation was found between the subject’s estimated threshold level and the HOA RMS (Pearson’s r=0.88, p<0.001). The linear correlation can be used to estimate the threshold level for each individual subject, subsequently leading to a method for estimating individual’s DOF from a single measurement of their wavefront aberrations.

Impact and interest:

6 citations in Scopus
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14 citations in Web of Science®

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58 since deposited on 14 Nov 2010
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ID Code: 38481
Item Type: Journal Article
Keywords: wavefront , aberrations, depth of focus, image quality metrics
DOI: 10.1167/10.4.3
ISSN: 1534-7362
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Optometry and Ophthalmology not elsewhere classified (111399)
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 2010 The Association for Research in Vision and Ophthalmology
Deposited On: 15 Nov 2010 08:34
Last Modified: 01 Mar 2012 00:20

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