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Comparative Study
. 2008 Feb;34(2):215-21.
doi: 10.1016/j.jcrs.2007.09.022.

Evaluation of iris recognition system for wavefront-guided laser in situ keratomileusis for myopic astigmatism

Sudipta Ghosh  1 , Terry A Couper, Ecosse Lamoureux, Vishal Jhanji, Hugh R Taylor, Rasik B Vajpayee
Affiliations
Comparative Study

Evaluation of iris recognition system for wavefront-guided laser in situ keratomileusis for myopic astigmatism

Sudipta Ghosh et al. J Cataract Refract Surg. 2008 Feb.

Abstract

Purpose: To evaluate the visual and refractive outcomes of wavefront-guided laser in situ keratomileusis (LASIK) using an iris recognition system for the correction of myopic astigmatism.

Setting: Centre for Eye Research Australia, Melbourne Excimer Laser Research Group, and Royal Victorian Eye and Ear Hospital, East Melbourne, Victoria, Australia.

Methods: A comparative analysis of wavefront-guided LASIK was performed with an iris recognition system (iris recognition group) and without iris recognition (control group). The main parameters were uncorrected visual acuity (UCVA), best spectacle-corrected visual acuity, amount of residual cylinder, manifest spherical equivalent (SE), and the index of success using the Alpins method of astigmatism analysis 1 and 3 months postoperatively. A P value less than 0.05 was considered statistically significant.

Results: Preoperatively, the mean SE was -4.32 diopters (D) +/- 1.59 (SD) in the iris recognition group (100 eyes) and -4.55 +/- 1.87 D in the control group (98 eyes) (P = .84). At 3 months, the mean SE was -0.05 +/- 0.21 D and -0.20 +/- 0.40 D, respectively (P = .001), and an SE within +/-0.50 D of emmetropia was achieved in 92.0% and 85.7% of eyes, respectively (P = .07). At 3 months, the UCVA was 20/20 or better in 90.0% and 76.5% of eyes, respectively. A statistically significant difference in the amount of astigmatic correction was seen between the 2 groups (P = .00 and P = .01 at 1 and 3 months, respectively). The index of success was 98.0% in the iris recognition group and 81.6% in the control group (P = .03).

Conclusion: Iris recognition software may achieve better visual and refractive outcomes in wavefront-guided LASIK for myopic astigmatism.

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