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Computer simulation of visual outcomes of wavefront-only corneal ablation

Yi, Fan, Iskander, D. Robert, Franklin, Ross , & Collins, Michael J. (2006) Computer simulation of visual outcomes of wavefront-only corneal ablation. Journal of Cataract and Refractive Surgery, 32(3), pp. 487-494.

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Abstract

Purpose.
To evaluate the effectiveness, predicted visual outcome, and limitations of a corneal ablation algorithm that uses wavefront aberration measurement alone without the need for corneal shape information.

Setting.
Contact Lens and Visual Optical Laboratory, School of Optometry, Queensland University of Technology, Brisbane, Australia.

Methods.
Corneal topography and wavefront error data from 22 eyes of 11 potential refractive surgery candidates were used. A computer simulation of the corneal ablation was performed, and the predicted postoperative visual outcome was assessed by calculating the resulting wavefront root-mean-square (RMS) values and visual Strehl ratios. Additionally, the effect of ablation alignment error was examined. Finally, the visual outcomes of the wavefront-only corneal ablations were compared to those in an age-matched group of 20 emmetropic patients.

Results.
Significant improvement in total and higher-order wavefront RMS was achieved postoperatively in both an ideal setting and in the case of ablation alignment errors. The predicted improvement in visual Strehl ratio in the potential refractive surgery candidates was significantly better than that in the untreated emmetropes. After additional simulated decentration of the pupil center by 150 μm, the result was slightly worse, but the change was found to not be significant when compared to the retinal image quality of emmetropes.

Conclusions.
Wavefront-only corneal ablation algorithms could potentially lead to significantly better visual outcomes than those normally encountered in untreated emmetropes, provided that the alignment error is not large. The presented methodology may be used as a screening tool to predict patients' visual outcomes before the surgery.

Impact and interest:

4 citations in Scopus
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3 citations in Web of Science®

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ID Code: 3823
Item Type: Journal Article
Additional Information: For more information, please refer to the journal's website (see hypertext link) or contact the author.(m.collins@qut.edu.au)
Keywords: visual Strehl ratio, corneal ablation algorithm, corneal topography, wavefront aberration, predicted visual outcome, retinal image quality
DOI: 10.1016/j.jcrs.2005.12.073
ISSN: 0886-3350
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Vision Science (111303)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Optical Technology (111302)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2006 Elsevier
Deposited On: 13 Jul 2006
Last Modified: 29 Feb 2012 23:30

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